What Is an IP Address?

The simple definition

An IP address (Internet Protocol address) is a unique number assigned to every device that connects to a network using the internet protocol. Think of it like a postal address for data: when you request a web page, the server needs to know exactly where to send it — and your IP address is that destination label.

A typical IPv4 address looks like this: 203.0.113.42. An IPv6 address looks like this: 2606:4700:4700::1111. Both do the same job — identify a connection — just with different amounts of room. You can see your own public address right now on our homepage; it appears the instant the page loads.

How an IP address works

When your device sends anything across the internet — a search, a video stream, an email — the data is chopped into small packets. Every packet carries two addresses in its header: your IP (the return address) and the destination's IP. Routers along the way read those headers and forward each packet one hop closer, the same way a sorting office routes a letter.

Because the packets carry your return address, the reply — the web page, the video frames — knows how to find its way back to you. No IP address, no delivery.

Public vs private IP addresses

Here's where most confusion starts: your devices actually have two kinds of IP addresses at the same time.

• Private (local) IP — assigned by your Wi-Fi router to each device in your home: often something like 192.168.1.42 or 10.0.0.15. These only exist inside your own network. Millions of houses in the world use the exact same private addresses without conflict.
• Public IP — the address your Internet Service Provider (ISP) gives your router, which represents your entire household on the internet. Every website you visit sees this one. It's what our IP lookup tool shows.

The translation between the two happens inside your router, in a process called NAT (Network Address Translation). That's why your laptop, phone and TV all browse under a single public IP address.

What your IP reveals about you

Whoever sees your IP address can find out roughly:

• Your approximate location — usually the city or region, sometimes just your ISP's routing hub. See for yourself with our IP location tool.
• Your ISP and organisation — the company that owns the address (Comcast, Orange, Vodafone, a hosting provider…).
• Your connection's reputation — whether the address appears on spam or abuse blacklists, or belongs to a VPN or proxy.

What it cannot reveal: your name, your street address, your precise GPS position. Only your ISP can connect an IP to a customer account, and it does so only when legally required. Check what your own IP exposes — the results often surprise people in how vague they are.

Dynamic vs static IPs

Most home users have a dynamic IP: the ISP lends you an address for a while (a DHCP lease), then swaps it. Reboot your router and you may well come back with a different address. A static IP never changes — businesses buy them to host servers, and some ISPs offer them as a paid add-on. If you've noticed your address changing between visits to this site, that's the dynamic lease at work.

How to protect (or hide) your IP

You don't need to obsess over your IP — every connection needs one. But if you'd rather not share it:

• VPN (Virtual Private Network) — routes all your traffic through a server elsewhere, so sites see the VPN's IP instead of yours. Most reliable option.
• Proxy servers — similar, but usually limited to your browser or a single app. Many are detectable; you can verify any address with our Proxy & VPN Check.
• Tor — free and highly anonymous, but noticeably slower.
• Router reboot — with dynamic IPs, simply reconnecting may hand you a new address (though your ISP keeps records linking old and new).

Curious what a website actually learns from your visit? Scroll back to the top of our homepage — the country, city and ISP shown there is the complete picture.