Most devices on the internet use IPv4 addresses to communicate, and the world is slowly adopting IPv4’s replacement, IPv6. Every device connected to the internet needs a unique IP address in order to connect and communicate with other devices online.
An IPv4 address looks like this:
And an IPv6 address looks like this:
If you’re connected to wifi right now, you probably share a public IP address with everyone else connected to the same wifi network, but each device has its own local IP address. However, if you’re on a smartphone and using a mobile data connection, you might well have your very own public IP address.
When most people talk about changing their IP address, they’re referring to their public IPv4 address. This is the address seen and used by most websites, servers, online games, and other devices on the internet.
This article, however, will cover changing your IP address whether it be IPv4 or IPv6, public or private.
What are the best VPNs to change your IP address?
- NordVPN: The best VPN to change your IP address. Fast servers in 59 countries. Apps for all popular devices. Many advanced features. No-logging policy. Works with Netflix US, iPlayer, and many more.
- Surfshark: Best budget VPN to change your IP. Allows an unlimited number of connections. Great for families. Apps for all popular devices. Built-in adblocking and malware filtering. 30-day money back guarantee.
- ExpressVPN: A superb all-rounder. Fast speeds thanks to its Lightway protocol. Servers in 94 countries. Works with around two-dozen Netflix regions.
- CyberGhost: Best way to change your IP for beginners. Over 7000 fast servers in 89+ countries. Fast Wireguard connections. Apps for all devices. Easy to use apps with fewer advanced settings.
- IPVanish: A fast US VPN with a proprietary network. Lots of advanced security features. No logs policy. Works with Netflix US. Apps for all platforms.
- PrivateVPN: Perfect for torrenting. Kill-switch and obfuscation features. Robust AES encryption. Great speeds. Servers in 63+ countries.
- AtlasVPN: Excellent option for streaming. Works with iPlayer, Hulu, Netflix, and more. Servers in 30+ countries. Includes malware filtering.
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Why would I need to change my IP address?
Many online services are geo-restricted, which means they are not available outside of their country of origin. The only way to access those services from abroad is to connect to a VPN server in that location. This gives you a valid IP address and causes the website or online service to become available again.
If you travel abroad on vacation, services from back home, such as internet banking or streaming services, will be geo-restricted. As a result, you will need to use a VPN to get an IP address in your home county.
Finally, a VPN can help you get around government, ISP, or local network restrictions. By connecting to a VPN, you can get an IP address in a country where locally censored content is still available. Thanks to the privacy provided by the VPN, you can access those usually censored services without being tracked.
Best VPNs for changing your IP address – at a glance
We’ve compared the most important features for the top VPNs here. Prefer to read the in-depth reviews? Start with NordVPN – our #1 choice for changing your IP address.
|Website||NordVPN.com||Surfshark.com||ExpressVPN.com||Cyberghost.com||IPVanish.com||PrivateVPN.com||atlasvpn.com||Ranking for changing your IP address||1||2||3||4||5||6||7||Total number of servers||5,595||3,200||Undisclosed||9,073||2,200+||200+||750+||Avg Speed (Mbps)||100+ Mbps||100+ Mbps||100+ Mbps||100+ Mbps||100+ Mbps||39 Mbps||100+ Mbps||Popular Sites Unblocked||95%||88%||86%||85%||70%||85%||93%||Devices Supported||Windows, MacOS, iOS, Android, Linux, Smart TVs, Routers||Windows, MacOS, iOS, Android, Linux, Amazon Fire TV||Windows, MacOS, iOS, Android, Linux, Smart TVs, Routers||Windows, MacOS, Linux (command line), iOS, Android, Smart TVs Routers||Windows, MacOS, iOS, Android||Windows, MacOS, iOS, Android, Linux, Amazon Fire TV, Routers||Windows, MacOS, iOS, Android, Linux, Android TV, Amazon Fire TV|
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How to change your public IP address
Here are a few ways to change your public IP address(es):
1. Connect to a VPN to change your IP address
Short for Virtual Private Network, a VPN encrypts your internet connection and routes it through a server in a location of your choosing. Websites, online services, and other devices on the web will only see the VPN server’s IP address and not your real IP address.
VPNs are useful for torrenting, unblocking region-locked content like that from Netflix and BBC iPlayer, and bypassing censorship at schools, in offices, and in countries like China.
Most VPNs can easily hide your IPv4 address, but many VPNs can leak your IP address through various security vulnerabilities. Furthermore, not all VPNs hide your IPv6 address. Choose a VPN that either disables IPv6 or can prevent IPv6 leaks by default.
If you’re not sure how to set up a VPN just follow the simple steps below.
Here’s how to change your IP address with a VPN:
- Sign up for a suitable VPN provider (we recommend NordVPN).
- Download the appropriate VPN app for your device.
- Open the VPN app and select a server, within your own country is fine although if you want to access a specific service make sure to choose a server in a country where it’s unblocked.
- That’s it! You should now have a different IP address.
2. Use a proxy to change your IP address
Proxies work similarly to VPNs but with far less versatility and security. Your internet connection goes through a middleman server so that websites and other online resources see the proxy server’s IP address and not your own. Unlike VPNs, proxies often lack encryption, only affect certain apps, and can leak your IP address through other means.
A few different types of proxies can be used to change your IP address:
- HTTP/S proxies – Usually either browser extensions or special websites that work like a browser within your browser. They only change the IP address on data sent to and from your browser, but do not affect other apps or even DNS traffic. If encryption is included, these are sometimes called SSL proxies.
- SOCKS proxies – General purpose proxy servers that can be configured for specific apps including most web browsers. SOCKS5, the latest version, includes support for encryption.
- SSH proxies – SSH proxies forward internet traffic from apps like your web browser through a Secure Shell (SSH) connection to a server, so your IP address is changed to that of the server. Although encryption is included, SSH is not a particularly fast protocol, and many websites and apps might not function properly when connected.
3. Use Tor to change your IP address for free
Tor, short for The Onion Router, is a volunteer-run anonymity network. The easiest way to get started with Tor is to download and install the Tor Browser, a barebones web browser that routes all web traffic through the Tor network. Tor encrypts your connection several times and then sends data through multiple nodes—servers operated by volunteer Tor supporters. Each node strips away one layer of encryption, and the sequence of nodes used changes every time you access a different website. This makes it nearly impossible to trace Tor traffic back to the source.
Websites will see the IP address of the last node in the chain, called the Exit Node.
Tor is free, but has its drawbacks. It’s relatively slow and only really suited for basic web browsing. Tor’s anonymity means it is often associated with illicit activity and the dark web, so even though it’s not illegal, using it might draw unwanted attention from your ISP and possibly even law enforcement. Those entities can’t see what you do while connected to Tor, but they can see that you are connected to Tor nodes.
4. Change IP addresses by unplugging your modem
You might be able to get a new IP address by unplugging your internet modem, waiting a few minutes, and then plugging it back in again. When this happens, you release your existing IP address so that your ISP can recycle it. When you reconnect, your ISP assigns you a new IP address.
This method isn’t guaranteed to work because your ISP might just give you the same IP address again. The longer you leave your modem unplugged, however, the higher the chance your IP address changes. If unplugging for a few minutes doesn’t get the job done, consider leaving it unplugged overnight.
Your ISP must use dynamic IP addresses in order for this to work. Most do.
5. Ask your ISP to change your IP address
Another option is to ask your ISP for a new IP address. Every ISP has different policies about how they handle such requests, so responses may vary. At minimum, you’ll need your account information and current IP address on hand.
Most ISPs use dynamic IP address systems, meaning IP addresses occasionally change and get recycled as devices connect and disconnect from the internet. With that in mind, note that your new IP address might not stay the same forever.
In some cases, you can request a static IP address from your ISP, though this might require paying an extra fee and/or going through an application process. Once provided with a static IP address, you can enter it into your device’s network settings. Static IP addresses never change unless you manually change them.
6. Change networks to get a different IP address
This might seem obvious, but you can get a different IP address by disconnecting from whatever network you’re currently connected to and connecting to a different one. You can switch to a different wifi network, for example, or switch from wifi to a mobile data connection if you’re on a smartphone.
Remember that public and open wifi hotspots are often prime hunting grounds for hackers. Try to stick with a wifi network that requires a password and is encrypted with WPA2.
How to change your private IP address
If you’re connected to a wifi router, then you probably share a public IP address with all the other devices connected to the same network. Each device, however, has its own private, or local IP address.
Changing your local IP address won’t really affect how your device communicates with other devices and servers over the internet, but there might be instances in which you need a different private IP address. These include troubleshooting a malfunctioning router or configuring how local devices, such as printers and IoT devices, function on your home network.
Renew your local IP address
If you’re connected to wifi or some other type of local network, you can change your private IP address from the router admin panel or from the device itself. I’ll show you how to do it on Windows and MacOS.
Here’s how to renew your IP address on Windows:
- Search for the Command Prompt and right click it to Run as administrator
- Enter ipconfig /release
- Enter ipconfig /renew
You should now see a new local IP address.
Here’s how to renew your IP address on Mac:
- Click the Apple menu and open System Preferences
- Select Network
- Highlight the network that you’re connected to in the left pane
- Click Advanced…
- Select the TCP/IP tab
- Click Renew DHCP Lease
You Mac should now be assigned a new local IP address.
The process for changing local IP addresses on the router varies depending on your router manufacturer and firmware. You can usually access your router’s admin dashboard by opening a web browser and entering 192.168.0.1 or 192.168.1.1 in the address bar.
How do I change my IP address on my mobile device?
Changing your IP address is easy on a mobile phone or tablet device. All you need is a VPN. In this guide, we have recommended the best VPNs for changing your IP address. Our recommendations have servers located globally, to let you get an IP address wherever you need it. To change your IP address on a mobile device, follow the steps below:
- Sign up for the VPN by following the link in this guide (we recommend NordVPN)
- Install the VPN app for Android or iOS onto your device. You can find it in your regular app store.
- Launch the VPN app and login using your credentials.
- Choose a VPN server from the list and click connect.
- Your IP address will change as soon as the VPN connection is established.
Your ISP always knows your IP address
No matter what methods you use to change or hide an IP address, public IP addresses are always known by the internet service provider. This is inevitable because in order to connect to the internet at all, your ISP must assign you an IP address, and it must know what that IP address is in order to transmit communication and data from the internet to your device.
So even if you used one of the above methods to mask your IP address from websites, services, and other devices on the internet, your ISP is an exception that can see behind the mask.
Even if your ISP can identify you by your IP address, however, you can hide your online activity through encryption. A VPN or Tor will encrypt all data before it ever leaves your device, so even though your ISP can see that you are communicating, it cannot see the contents of those communications.
If you need an easy way to change your IP address to that of a different ISP, try switching between wifi and your smartphone’s mobile data connection. Chances are, your phone carrier and home internet use different ISPs.
Changing IP address: FAQs
Why does changing my IP address catch CAPTCHA requests?
Changing your IP address may result in you catching CAPTCHA requests. The reason for this is because the IP address in question is likely shared with many other users. From the perspective of an online service such as Google, it sees an unusually high number of requests from the same IP address. It then attempts to verify you're human (as opposed to a bot!) by presenting you with CAPTCHAs.
Will a free VPN change my IP address?
Technically yes, you can change your IP address with a free VPN. There are, however, a few things about these services that make them less than ideal. For instance, free providers usually have very low monthly bandwidth limits and more users than their networks can support. This means that you may not be able to use the VPN as much as you like, and you'll have to put up with slow speeds when you do get connected.
One of the main functions of a VPN is to keep you safe online. Unfortunately, free providers tend to forget this, with plenty falsely claiming to follow no-logs policies or overhyping the effectiveness of their security features. Why take a chance when your privacy is at stake? We'd recommend choosing a reputable no-logs provider instead of just using whatever is free.
Is it illegal to change my IP address?
No, it's not illegal to change your IP address. Indeed, you can legally use a VPN in almost any country in the world without having to worry about breaking any laws. However, some online activities are still illegal regardless of whether you've used a VPN to change your IP. This includes torrenting copyrighted material or, in some countries, accessing betting websites.
Will a VPN ever expose my real IP address?
The short answer is no. A Virtual Private Network (VPN) provides an encrypted tunnel between your device and the internet, shielding your real IP address from anyone trying to track you online. The data passing through this tunnel is highly secured with strong encryption algorithms, making it nearly impossible for someone to determine which server or network you are connected to or even know who you are. However, there are a few situations when your real IP address can still be exposed:
- If a malicious actor takes control of the VPN server and gains access to its logs.
- If the VPN service provider stores information that includes IP addresses (although many reputable VPNs do not store any logs at all).
- If a website or service you connect to uses an IP address checker to detect your true identity.
In all these scenarios, it is important to remember that a VPN does provide additional security and privacy by masking your real location and the IP address from websites and services you visit. However, for the utmost security and anonymity, it is recommended that you also use other privacy tools such as browser extensions, secure browsers, and encrypted messaging apps in addition to a VPN. With this multi-layered approach to online security, you can rest assured knowing that your real identity will remain hidden no matter what situation arises.
Do I need a dedicated IP address?
You can use a shared IP address, but they tend to come with more risk.A dedicated or static IP address is recommended but there are only a handful of VPNs with dedicated IP addresses. Having a unique IP address can help to protect you from specific threats, such as a Brute Force attack, but it's worth noting that it isn't foolproof. You will also need to ensure you follow good online security practices, including strong passwords, two-factor authentication, and not accessing suspicious websites.
Can I get a new IP address from my ISP?
It's possible to get a new IP address with some ISPs. However, it really depends on the ISP in question. If you find that your ISP don't accept your request, you could try some of the other options as listed in this post (such as unplugging your router). Of course, the best way to change your IP address while enjoying additional security and privacy-related benefits is to use a VPN.
Can I choose which location my new IP address is in?
A VPN allows you to choose the location of the server to which you connect. The best VPNs offer servers in dozens of countries around the world. Once you connect to one of these servers, you'll be assigned an IP address to match that location. For example, if you connect to a server in Australia, you'll be given an Australian IP address. It's that simple! So yes, you can choose the location your new IP address is in.
What should I do if my IP address isn't changing with my VPN?
When you connect to a VPN server, your IP address should change to be in the location you selected. A VPN is designed to encrypt your data and route it to the remote service location, and as long as it is working correctly, your IP address should always update to the corresponding location.
Unfortunately, some VPNs are broken. They do not properly conceal your home IP address from the websites you visit, and/or they fail to conceal your DNS requests from your ISP. These problems are called "leaks" and VPNs that suffer from leaks are completely failing to:
- Provide you with online privacy
- Conceal your IP address from the websites you visit
If you want to know whether your VPN is changing your IP address, we recommend that you use an online IP address-checking tool. The IP address and DNS request results should show as the location of the VPN server (not your real location).
If for any reason you see a local IP anywhere on the IP leak test's website, then it is likely that your VPN is failing to properly hide your home IP address. That means that the VPN is either no good (you need a new one), or you need to update your VPN software to make sure it is up to date and working correctly.
Remember that it is important to use a reliable VPN like the ones recommended on this page, and to periodically check for IP leaks using an online IP address-checking tool to ensure your VPN is working correctly on your device.
Fortunately, there are several ways you can hide your real IP address for free. Only your ISP can change your real IP address, but proxy-based solutions can hide your IP address and change it as far as observers on the internet are concerned. Note that this article only discusses how to change your public IP address.How to change IP address step by step? ›
- Select Start , then select Settings > Network & Internet .
- Do one of the following: For a Wi-Fi network, select Wi-Fi > Manage known networks. ...
- Under IP assignment, select Edit.
- Under Edit IP settings, select Automatic (DHCP) or Manual. ...
- When you're done, select Save.
Fortunately, there are several ways you can hide your real IP address for free. Only your ISP can change your real IP address, but proxy-based solutions can hide your IP address and change it as far as observers on the internet are concerned. Note that this article only discusses how to change your public IP address.How do I force my IP address to change? ›
- Right-click the Start menu and select Command Prompt (Admin).
- Enter your admin username and password, if prompted.
- A command prompt window will open. At the flashing cursor, type ipconfig /release. ...
- Type ipconfig /renew to get a new IP address.
- Type exit to exit the command prompt.
- In Android Settings, tap Connections, then Wi-Fi.
- Tap Settings (the gear icon) next to your current network.
- Tap IP settings and choose Static. Then add your new IP address and tap Save.
- Go to Settings and tap Wi-Fi → [network name].
- In the IPv4 Address section, Note down your current IP address, the Subnet Mask, and the Router address. Then tap Configure IP.
- Select Manual. ...
- Tap Save at the top right when you're done.
To access this feature, go to your device Settings, select "About Phone," and enable developer options. Then go to "Developer" options and enable "Mock location". Several free Fake GPS apps on the Google Play Store allow you to change the location of your Android device.Can I change my IP myself? ›
Yes, you can change your IP address yourself. Use a VPN, proxy, or your router to switch your IP, or log into your device's settings through the steps above to get a different IP address on your own.How do I get a VPN for free? ›
- Hotspot Shield - Best Overall. ...
- 500 MB Daily Data Usage Limit. ...
- PrivadoVPN - Best Free VPN with Unlimited Speeds. ...
- Atlas VPN - Best Free VPN for Privacy. ...
- Surfshark - Best Encryption. ...
- TunnelBear - Best Free VPN for Beginners. ...
- Windscribe VPN - Best Free VPN for the Security.
Get full details on setting up your ExpressVPN app to change your IP address on Android, iOS, Windows, Mac, Linux, and routers.
Changing your IP address is as easy as unplugging your router. The easiest and quickest way to get a new IP address is to see what your IP address is via an IP-checking site, then walk over to your router and unplug it for at least five minutes.What is my phone's IP address? ›
Go to your phone's settings. Select “About device.” Tap on “Status.” Here you can find information about your device, including the IP address.What is my private IP? ›
Select settings. Go to Wi-Fi, tap the i that appears next to the network it is connected on, and the IP address will display under the DHCP tab. Android. Select Settings, go to About, tap on Status and the IP address should be visible.Can I change my IP address on my phone? ›
Can I change the IP address of my phone? Yes, you can; you can use a VPN, Tor or do it manually. The latter involves finding an unassigned IP address and then changing your current IP to the new one in your Wi-Fi network connection's settings.Can I change my IP address by resetting my phone? ›
- Open the Settings menu on your device and go to “Network & Internet“.
- Select the network you're connected to.
- Tap on the “Reset Network Settings” button. For this example, the icon is located on the upper right section of the screen.
A VPN replaces your actual IP address to make it look like you've connected to the internet from a different location: the physical location of the VPN server, rather than your real location. This is just one reason why so many people use VPNs.How can I change my IP address without VPN for free? ›
- #1. ...
- Use a proxy to hide your IP address. ...
- Use Tor to hide your IP address for free. ...
- Connect to a different network to change your IP address. ...
- Ask your ISP to change your IP address. ...
- Unplug your modem to change your IP address. ...
- Use a NAT Firewall to hide your private IP address.
- Open the Google Home app .
- Tap Wi-Fi Settings. Advanced Networking.
- Tap DHCP IP reservations. Add IP reservations .
- Tap the device for which you'd like to assign a static IP.
- Enter a static IP address, then tap Save .
You can use Free VPN with your Apple ID on other iPhone, iPad and iPod devices. You can also register a unlimited number of devices. Free VPN, blocks 98% of ads, providing a better and seamless experience. Free VPN, can stream unlimited data.Can a cell phone IP address be traced? ›
Can Someone Else Trace My IP Address? Yes. In the same way that you can track other people's IP addresses, they can track the IP addresses for your devices. Obviously, this is a privacy concern for some people, so if you want to hide your IP address information, you should use a virtual private network (VPN).
When a device is assigned a static IP address, the address does not change. Most devices use dynamic IP addresses, which are assigned by the network when they connect and change over time.What is the proxy server address? ›
A proxy server address typically consists of the IP address of the proxy server and the port number that it is listening on. For example, a proxy address might look like this: 192.168. 1.100:8080 . This indicates that the proxy is running on the IP address 192.168.Is there a fully free VPN? ›
Without data restrictions, Proton VPN is the only service that could be a true, daily driver free VPN. However, the limited server options means that you'll want to be in (or relatively close to) the countries where servers are offered.Are there 100% free VPNs? ›
Is there a 100% free VPN? Yes, and there are a few pretty good ones, too. For example, hide. me's free plan allows torrenting, provides strong security and privacy, and lets you connect to servers in 5+ countries, and Proton VPN's free plan allows unlimited data, has fast speeds, and is very secure.How to get a 100% free VPN? ›
Proton VPN: Great VPN free plan that offers unlimited data. hide.me: VPN that has very good customer service for free and paid plans. TunnelBear: Free VPN plan that offers a wide range of server locations. Windscribe: Free VPN that is superb for those in need of high internet speed.Who changes your IP address? ›
Your ISP can either configure your IP address to be static (it stays the same) or dynamic (it can change).What happens if you turn your IP address off? ›
Without an IP address, you will not be able to access the Internet to perform any online activities. Every website you visit can see your IP address as soon as you connect. It is necessary in order to allow data to flow between you and the website.Is IP address your phone or WIFI? ›
Your IP address is assigned to your device by your ISP. Your internet activity goes through the ISP, and they route it back to you, using your IP address.What is my Android device IP address? ›
Go to Settings >> Wireless & networks/WLAN, or Settings >> Network & Internet >> Wi-Fi. Tap on the Wi-Fi you are connected to, then it will show the network info including signal strength, security, MAC address and IP address.Does each device have its own IP address? ›
Every device that can connect to the internet is a member of the World Wide Web — computers, laptops, tablets, mobile phones, routers, etc. — and all have an IP address. Websites and computer networks require this form of identification for you to interact with them.
Your IP address is essential for sending and receiving information online. But if a hacker knows your IP address, they can use it to seize valuable information about you. Using it as a starting point in a broader attack, they could hack your device or intercept your online traffic, just for starters.How do I know if my IP is public or private? ›
To check if your IP address is public, you can use myip.com (or any similar service). You will be shown the IP address that was used for accessing the site; and if it matches the IP address that your Internet service provider assigned you, then you have a public IP address.What are the 3 private IP addresses? ›
- Class A: 10.0. 0.0 to 10.255. 255.255.
- Class B: 172.16. 0.0 to 172.31. 255.255.
- Class C: 192.168. 0.0 to 192.168. 255.255.
A proxy server is a system or router that provides a gateway between users and the internet. Therefore, it helps prevent cyber attackers from entering a private network. It is a server, referred to as an “intermediary” because it goes between end-users and the web pages they visit online.Can I be tracked if I use VPN? ›
VPNs are useful for many things, and when used properly, can protect you from being tracked in several ways: Websites can't track you using your real IP address. Your internet service provider (ISP) can't track what you do on the internet. Your government can't track what you do on the internet via your ISP.What are proxy settings? ›
A proxy server can change your IP address, so the web server doesn't know exactly where you are in the world. It can encrypt your data, so your data is unreadable in transit. And lastly, a proxy server can block access to certain web pages, based on IP address.Can I hide my IP address? ›
There are essentially two methods you can choose from to hide your IP address. One is using a proxy server, and the other is using a virtual private network (VPN). Either one will be sufficient, but there are a few cons associated with proxy servers that make VPNs a more optimal choice for many.Can I change my IP address myself? ›
Tap and hold the WiFi network that you're connected to. Tap Modify Network. Expand or go to the Advanced options. Change your Android's IP address in the IP settings from DHCP to Static.Does restarting router change IP? ›
Your internet provider assigns a public, dynamic IP address to your router or wireless gateway. When you reboot either device, it receives a new IP address from your internet provider.Where is my IP address located? ›
Click on “Start”, then “Settings”, “Network & internet”, “Wi-Fi”. Select the network you're connected to. Click on “Properties.” Scroll down to the bottom of the window — your IP will be shown next to “IPv4 address.”
On the taskbar, select Wi-Fi network > the Wi-Fi network you're connected to > Properties. Under Properties, look for your IP address listed next to IPv4 address.Where do I find my IP address? ›
On an Android/tablet
Go to your Wifi network settings, then select the network you're connected to. You'll find your IP address along with the other network information.
Or put more simply DHCP is the process your Internet Service Provider (ISP) uses to assign an IP Address to your home or business. Your ISP can either configure your IP address to be static (it stays the same) or dynamic (it can change).How do I find my router username and password without resetting it? ›
The easiest way of how to find routers password is by checking the sticker at the back of the router box. The sticker will show you the password along with other details such as serial number, mac address and other details that you will need to access the router interface.Is it okay to unplug router every night? ›
Summary: Should You Turn Off Your WiFi Router at Night? In a word, yes. Turning your WiFi router off at night drastically reduces exposure to unnecessary radiation. You'll also save energy in the process.Is A modem the same as a router? ›
A modem is a box that connects your home network to your internet service provider, or ISP. A router is a box that lets all of your wired and wireless devices use that internet connection at once and allows them to talk to one another directly.How often does router IP change? ›
Every 14 days there is a DHCP lease renewal that takes place that acts kind of like a handshake between the ISP and a household modem. If the connection is still valid the ISP will move on and not disrupt service via provisioning a new IP address.