Your IP address changes when your internet service provider assigns you a new one, which usually happens when you restart your modem or router, switch providers, or move to a new location.

An IP address is a number that identifies your device on the internet, similar to a mailing address for your computer. Your internet service provider (ISP) assigns this number to you. Most home internet users have a dynamic IP address, which means it can change. Some businesses pay for a static IP address, which stays the same.

The timing and frequency of changes depend on your ISP's settings and your own actions. You might see a change happen within hours, or your address might stay the same for months. Understanding what triggers a change helps you know what to expect and whether a change is normal.

Key Takeaways

  • Restarting your modem or router is the most common reason your IP address changes, because your ISP reassigns a new one when you reconnect.
  • Most home internet plans use dynamic IP addresses that can change every few days to every few months, depending on your ISP's lease period.
  • Your IP address will definitely change if you switch internet providers or move to a new location, because a different ISP controls the address.
  • Websites and services can see your IP address, so a change may log you out of accounts or affect services that track your location by IP.

What happens when you restart your modem or router

Restarting your modem is the single most common reason an IP address changes. When you unplug your modem, wait 30 seconds, and plug it back in, your modem disconnects from your ISP's network and reconnects. During that reconnection, your ISP assigns your modem a new IP address from its available pool.

This does not happen every single time you restart—sometimes your ISP reassigns the same address back to you. But if your modem has been offline for a while, or if your ISP's lease on that address has expired, you will get a different one. A restart is a may provide way to attempt a change if you need one for troubleshooting or privacy reasons.

How ISP lease periods work

Your ISP does not permanently assign your IP address. Instead, it leases the address to you for a set period—typically between one day and several months, depending on the provider. When the lease expires, your ISP can reassign that address to another customer and give you a new one.

You do not have to do anything for this to happen. Your modem automatically renews the lease or accepts a new address without your involvement. Some ISPs renew the same address repeatedly, so your IP might stay stable for months. Others rotate addresses more frequently. You have no control over the lease period your ISP uses.

Changing providers or moving to a new address

If you switch to a different internet service provider, you will receive a new IP address because the new ISP controls its own pool of addresses. The old ISP's address becomes invalid the moment you disconnect from their network. This change is when ready and unavoidable.

Moving to a new physical location also triggers a change, even if you keep the same ISP. Some ISPs assign addresses based on geographic regions, so moving to a different neighborhood or city may put you in a different address pool. Even if the same ISP serves both locations, you will likely receive a new address when you set up service at the new address.

Why websites see your IP address change

Websites, apps, and online services record the IP address you use to connect to them. When your IP address changes, these services may see you as a different user or device. This can trigger security warnings, force you to log in again, or cause location-based services to show a different region.

Some services use your IP address to detect fraud—if you suddenly appear to be in a different country, they may lock your account temporarily. Banks and email providers do this for security. If your IP changes frequently, you might need to verify your identity more often, but this is a normal part of how internet security works.

Static IP addresses for home users

Most home internet plans come with dynamic IP addresses at no extra cost. If you need an address that never changes, you can contact your ISP and request a static IP address. This typically costs extra per month—usually between $10 and $20, depending on the provider.

Static addresses are useful if you run a web server from home, use remote access software regularly, or need consistent access to security cameras. For typical browsing and streaming, a dynamic address works fine and is the standard option.

How to check your current IP address

You can see your IP address by visiting a website like WhatIsMyIPAddress.com or IPAddress.com in any web browser. These sites display your public IP address—the one your ISP assigned to your modem. This is different from the private IP address your router assigns to individual devices on your home network.

You can also check your IP address by searching "what is my IP" in Google, which displays your address at the top of the search results. Write down your current address, then restart your modem and check again after a few minutes to see if it changed.

Frequently Asked Questions

Can I prevent my IP address from changing?

You can reduce how often it changes by avoiding modem restarts and by requesting a static IP address from your ISP, though static addresses cost extra. However, you cannot prevent changes entirely—your ISP's lease will eventually expire and your address will rotate. If you switch providers or move, a change is unavoidable.

Does my IP address change every time I restart my router?

Not necessarily. Restarting your router (the device that creates your home Wi-Fi) does not change your IP address—only restarting your modem does. Your router is a separate device that connects to the modem. Restarting the modem is what causes your ISP to reassign an address.

Will my IP address change if I use a VPN?

A VPN masks your real IP address and shows websites a different one instead. Websites will see the VPN provider's IP address, not yours. If you disconnect from the VPN, websites will see your real IP address again. Your actual ISP-assigned address may or may not have changed in the background.

How often do IP addresses change for most home internet users?

This varies by ISP. Some providers renew leases every few days, while others keep the same address for months. There is no standard—it depends entirely on your provider's settings. The only way to know your ISP's pattern is to check your address weekly for a month and see how often it changes.

Does my IP address change when I switch Wi-Fi networks?

No. Your public IP address is assigned by your ISP to your modem and does not change when you connect to a different Wi-Fi network. However, if you move to a different building with a different ISP, that new ISP will assign you a new address.