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What Is My IP Address and Why Does It Change?

By the MyToolsBase team · Updated 2026-10-29

Every device online has a return address. Here's how to find yours, why it changes, and when it actually matters.

Every time you load a web page, your device sends out a request and waits for the answer to come back. For that answer to find you, your connection needs a return address. That return address is your IP address (IP stands for Internet Protocol), and it quietly decides more than you'd think: which version of a website you see, why a streaming service thinks you're somewhere else, and why your game console can't host a match.

Most people never need to think about it. But when something goes wrong, or when a support agent asks "what's your IP?", it helps to know that you don't have just one, and that it isn't supposed to stay the same forever.

You actually have two IP addresses

This is the part that confuses almost everyone. At home, two different kinds of address are in play at the same time:

• Your public IP address is the one the rest of the internet sees. Your internet provider assigns it to your router, and every device in your home shares it. When you visit a website, this is the address that shows up in its logs.
• Your private (local) IP address is the one your router hands to each device inside your home. Your laptop, phone, TV and smart speaker each get their own. These addresses only mean something inside your network.

Private addresses come from reserved ranges that are never used on the public internet, so you'll recognize them on sight: they start with 192.168., 10., or anything from 172.16. to 172.31.. If your laptop says its IP is 192.168.1.23, that's its private address — and your neighbor's laptop may well have exactly the same one on their own network.

Your router sits between the two worlds, translating as traffic passes through. This trick is called NAT (network address translation), and it exists largely because the older IPv4 system only has about 4.3 billion addresses, far fewer than there are connected devices. One public address for a whole household stretches the supply a long way.

How to find your IP address

Your public IP

The easiest way is to visit any "what is my IP" website from the device you're curious about; it simply reads the address your request arrived from. You can also log in to your router's admin page (often at 192.168.0.1 or 192.168.1.1 — the exact address is usually printed on a sticker on the router) and look for a status page labeled WAN, Internet, or Broadband.

Comparing the two is a useful test. If the WAN address on your router differs from what websites report, something in between is translating again — usually your provider's own NAT (more on that below) or a VPN you forgot was on.

Your private IP

• Windows: open Command Prompt and run ipconfig. Look for "IPv4 Address" under your Wi-Fi or Ethernet adapter.
• Mac: open System Settings, choose Wi-Fi, then Details next to your network. Or open Terminal and run ipconfig getifaddr en0.
• iPhone: Settings → Wi-Fi, then tap the info icon next to your network.
• Android: Settings → Network & internet → Wi-Fi, then tap your network (menus vary a little by manufacturer).

If the address you see starts with 169.254., your device didn't get an address from the router at all and gave itself a placeholder. That almost always means there's no working connection: turn Wi-Fi off and on, and if that doesn't help, restart the router.

Why your IP address keeps changing

Changing addresses are normal, not a sign that anything is wrong. Both kinds change, for different reasons.

Your public IP is usually "dynamic"

Most home internet plans come with a dynamic public IP. Your provider lends an address to your router for a period of time, called a lease, and may hand you a different one when the lease is renewed. In practice that tends to happen when:

• your router or modem restarts or loses power for a while,
• your provider does maintenance or reorganizes its network,
• you replace your router, or
• the lease runs out while your equipment was switched off.

Some people keep the same public IP for months; others see it change after every router reboot. Both are normal and depend on how the provider runs its network. Providers do it because reusing a shared pool of addresses is far more efficient than reserving a fixed one for every customer. A static IP, one that never changes, is usually a paid extra or comes with business plans.

Mobile data changes constantly

On mobile data, your public IP can change when your phone reconnects to the network, and switching between Wi-Fi and mobile data swaps it completely. Many mobile carriers also put large numbers of customers behind one shared public address, so the IP a website sees may belong to many strangers at the same moment.

Your private IP changes too

Your router hands out private addresses using a system called DHCP, which also works with leases. A phone that leaves the house for a day may come back with a different address. That's harmless for browsing, but annoying for things like a network printer that other devices need to find. The fix is a DHCP reservation (sometimes called "address reservation" or "static lease") in your router's settings, which tells it to always give that device the same address.

When your IP address actually matters

For everyday browsing, it doesn't. These are the situations where it does:

• Location guesses. Websites and streaming services estimate where you are from your public IP. These lookups are often only accurate to a city or region, and sometimes they're wrong by a long way, which is why a shop might show you a branch in the wrong town.
• Blocks and bans. Websites, forums and game servers can block an IP address. Because addresses get recycled, you might inherit one that a previous user got flagged on. If a single site suddenly refuses you while everything else works, restarting the router to try for a fresh public IP is worth a shot.
• "Unusual traffic" warnings. On a shared address — mobile data, a university, an office, or a VPN — search engines may ask you to prove you're human more often, because lots of people's activity appears to come from one place.
• Hosting and gaming. Running a game server, a home camera system or remote access to your computer requires that incoming connections can reach you. A dynamic IP makes that awkward; a service called dynamic DNS can keep a name pointed at your changing address.

Carrier-grade NAT: when you don't get a public IP at all

Because IPv4 addresses have run out, many providers — especially mobile networks, and some satellite, cable and fiber networks — now share one public address among many customers using carrier-grade NAT (CGNAT). A telltale sign: the WAN address on your router's status page falls between 100.64.0.0 and 100.127.255.255, a range set aside for exactly this purpose, or it's a private address like 10.x.x.x.

For browsing and streaming you won't notice anything. But CGNAT is why port forwarding sometimes does nothing, why some games report a "strict" or "moderate" NAT type, and why hosting anything from home fails. If you need incoming connections, ask your provider whether they can give you a public IPv4 address (some do on request, sometimes for a fee) or whether your connection supports IPv6, which has enough addresses for every device to have its own.

Does your IP address affect speed or outages?

No. An IP address is a label, not a speed setting, so getting a new one won't make your connection faster. If the internet feels slow, measure it with a speed test instead — ideally on a wired connection — and compare the result with what you pay for.

Your IP also isn't the reason a site won't load. If one website fails while others work, the problem is more likely the site itself, your DNS, or something along the route. You can check whether a site is down for everyone with the MyToolsBase checker. If your browser reports a lookup failure, our guide to DNS server not responding walks through the fixes, and for pages that spin and then give up, see ERR_CONNECTION_TIMED_OUT.

Quick reference: what your address is telling you

• 192.168.x.x, 10.x.x.x, 172.16.x.x–172.31.x.x on your device: a private address, meaningful only inside your home.
• 169.254.x.x on your device: it couldn't get an address — reconnect or restart the router.
• 100.64.x.x–100.127.x.x on your router's WAN page: you're behind carrier-grade NAT.
• Anything else on your router's WAN page: most likely your real public IP.

Knowing which address you're looking at answers most IP questions before you ever have to call anyone.

Frequently asked questions

Is it dangerous if someone knows my IP address?

Usually not. A public IP address reveals your internet provider and a rough location, typically a city or region, not your street address. Every website you visit already sees it. The realistic risks are nuisance traffic aimed at you in online games or someone probing your router, which an up-to-date router with a strong admin password handles.

Can two devices in my house have the same IP address?

They share the same public IP address, because the router presents the whole household to the internet as one address. Inside your home, each device gets its own private address, such as 192.168.1.23. If two devices end up with the same private address, you get an IP conflict and one of them loses its connection until it reconnects.

Why does a website think I'm in a different city?

IP location databases map blocks of addresses to places, and providers often register addresses to a regional hub rather than where you actually live. Mobile networks and VPNs make this worse. It is an estimate, not a fact, and it can be off by a long distance.

Will changing my IP address make my internet faster?

No. Your IP address is a label, not a speed setting. A router restart that gives you a new IP may coincidentally fix a stuck connection, but the speed you get depends on your plan, your Wi-Fi and network congestion.

How can I get a static IP address?

Ask your internet provider. Many offer a static public IP as a paid add-on or with business plans. For devices inside your home, you can instead set a DHCP reservation in your router so a printer or game console always gets the same private address.

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