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What Is an IP Address? A Beginner's Guide

Updated May 31, 2026

An IP address (Internet Protocol address) is a unique number that identifies a device on a network. Every phone, laptop, server and smart device that connects to the internet has one. Without it, data would have no way of knowing where to go.

How an IP address works

Think of an IP address like a postal address for your device. When you load a web page, your device sends a request stamped with its IP address. The server reads that address and knows exactly where to send the response. This happens billions of times a second across the internet.

IP addresses come in two main forms:

  • IPv4 — the original format, written as four numbers like 192.0.2.1.
  • IPv6 — a newer, much larger format like 2001:db8::1, created because the world is running out of IPv4 addresses.

We cover the distinction in detail in our guide to IPv4 vs IPv6.

Public vs private IP addresses

Your device actually has two kinds of IP address:

  1. Public IP — assigned by your internet service provider (ISP). This is what the wider internet sees, and it's the address shown on our home page.
  2. Private IP — assigned by your home or office router to each device on the local network (e.g. 192.168.0.5). These are reused on millions of networks and are never visible to the outside world.

Your router uses a technique called NAT (Network Address Translation) to let many devices share a single public IP.

Static vs dynamic IP addresses

Most home connections use dynamic IPs that change periodically. Businesses that host servers often pay for a static IP that never changes, which makes it easier to run services and configure DNS.

What your IP reveals about you

A public IP can be used to estimate your approximate location — usually your city or region, not your exact address — and to identify your ISP. It does not reveal your name, browsing history or the contents of your traffic.

If you'd rather keep your IP private, read our guide on how to hide your IP address.

Key takeaways

  • An IP address uniquely identifies your device on a network.
  • You have a public IP (seen by the internet) and private IPs (used at home).
  • IPv6 is gradually replacing IPv4 as available addresses run out.
  • Your IP reveals approximate location and ISP, but not your identity.