Your IP address changes depending on how your internet connection works

Most home internet users have a dynamic IP address, which means your internet service provider (ISP) assigns you a different address periodically — usually every few days to several months. If you have a business connection or pay extra, you might have a static IP address that stays the same indefinitely. The difference matters if you run a server, use remote access software, or need consistent network settings.

Your device also gets a separate local IP address on your home network (something like 192.168.1.5), which changes every time you restart your router or reconnect to WiFi. That local address is different from your public IP address, which is what websites and services see when you connect to them.

Key Takeaways

  • Dynamic IP addresses, the standard for home internet, change automatically on a schedule set by your ISP — typically every few days to several months.
  • Your public IP address (what the internet sees) is separate from your local IP address (what your home network uses), and they change on different schedules.
  • Static IP addresses stay the same but usually cost extra and are more common for business lines than residential service.
  • Restarting your modem or router can force an IP address change, though your ISP may reassign the same one immediately.
  • Websites and services can track your activity using your IP address, but changing it does not erase past records they already have.

Why ISPs use dynamic IP addresses

Internet service providers use dynamic IP addresses because there are not enough addresses to give every customer a permanent one. The current standard, IPv4, has about 4.3 billion possible addresses. With hundreds of millions of internet users worldwide, ISPs recycle addresses by reassigning them when customers disconnect or when a lease period expires.

From the ISP's perspective, this is efficient. When you turn off your modem, your address goes back into a pool and gets handed to another customer. When you turn it back on, you might get the same address or a different one, depending on what is available and how long the ISP's lease period is set to.

This system works fine for most people because home users do not need a permanent address. You browse the web, check email, and stream video — none of that requires your address to stay the same. The ISP only needs to know which address belongs to you at any given moment so they can route your traffic correctly.

When your IP address actually changes

Your public IP address changes when your ISP's lease expires. This happens on a schedule — common lease times are 24 hours, 7 days, or 30 days, though it varies by provider and region. You do not have to do anything; the change happens automatically in the background.

You can also force a change by restarting your modem. Unplug it for 30 seconds, plug it back in, and wait for it to reconnect. Your ISP may assign you a new address or may give you the same one again — there is no way to predict which. Some people restart their modems to get a different address, though this does not always work.

Your local network IP address (the one your devices use inside your home) changes when you restart your router or when your device reconnects to WiFi. This is separate from your public address and is managed by your router, not your ISP. Most home routers are set to hand out new local addresses every time a device reconnects, though you can configure this in your router settings if you need devices to keep the same local address.

Static IP addresses and how to get one

A static IP address stays the same indefinitely. Your ISP assigns it to you, and it does not change unless you request a change or cancel your service. Static addresses are useful if you run a web server, host a game server, use remote access software that connects to a specific address, or need consistent network settings for security cameras or other devices.

Most ISPs offer static IP addresses as an add-on service, usually for $10 to $20 per month on top of your regular bill. Some providers include it free with business-class internet. Availability depends on your location and ISP — not all providers offer it in all areas. Contact your ISP directly to ask whether static IPs are available for your address and what the cost is.

If you do not want to pay for a static IP, you can use a dynamic DNS service. These services monitor your IP address and update a domain name to point to whatever address you currently have. This way, you can access your home network using a consistent domain name even though your IP address changes. Services like No-IP and DynDNS offer free and paid tiers.

How IP address changes affect your devices and services

Most of the time, an IP address change is invisible to you. Your devices stay connected to the internet, your email keeps working, and your streaming services do not skip a beat. The change happens at the ISP level and does not interrupt your connection.

The main exception is if you have set up port forwarding or other network rules based on a specific IP address. If your address changes and you have told your router to send certain traffic to a device with a particular local IP, that rule might break if the device gets a new local address. This is rare for typical home users but common for people running servers or using advanced networking features.

If you use a VPN, your public IP address is hidden from websites and services — they see the VPN provider's IP address instead. Your actual IP address still changes on your ISP's schedule, but websites cannot see it. This does not mean your activity is anonymous; the VPN provider can still see your traffic, and your ISP can still see that you are using a VPN.

IP addresses and online tracking

Websites and services can see your IP address and use it to track your activity across sessions. If your address changes, they cannot automatically connect your old activity to your new address — but they can still track you if you log into an account, use cookies, or if they use other methods like device fingerprinting.

Changing your IP address does not erase records that websites already have. If you visited a website yesterday and they logged your IP address, that record stays in their database even if your address changes today. A new address only prevents them from connecting future activity to that old address.

If privacy is a concern, changing your IP address alone is not enough. You would need to clear cookies, use private browsing mode, disable JavaScript, or use a VPN — and even then, determined trackers have other ways to identify you. IP address changes are a side effect of how home internet works, not a privacy tool.

Frequently Asked Questions

How do I find out what my current IP address is?

Search "what is my IP" in any search engine and the result will show your public IP address. You can also visit websites like WhatIsMyIPAddress.com or IPChicken.com. To find your local network IP address, open your router's admin page (usually 192.168.1.1 or 192.168.0.1 in your browser) or check your device's network settings.

Can I keep my IP address from changing?

Yes, by getting a static IP address from your ISP, which usually costs extra per month. Alternatively, you can use a dynamic DNS service to keep a consistent domain name pointing to your changing IP address. For most home users, letting the address change is normal and does not cause problems.

Does restarting my router change my IP address?

Restarting your router changes your local network IP addresses (the ones your devices use inside your home). Restarting your modem might change your public IP address, but your ISP may assign you the same one again. There is no may provide which address you will get after a restart.

Will a VPN hide my IP address from my ISP?

No. A VPN hides your IP address from websites and services you visit, but your ISP can still see that you are using a VPN and can see your actual IP address. Your ISP cannot see the websites you visit when you use a VPN, but they know you are connected to a VPN service.

What is the difference between my public and local IP address?

Your public IP address is what the internet sees when you connect to websites and services. Your local IP address is what your home network uses to route traffic between your devices and your router. They are managed separately — your ISP controls your public address, and your router controls your local addresses.