What Is an IP Address?

Acutis · plain-English network help · updated June 2026

What is an IP address, in plain English?

An IP address is the unique number that identifies a device on a network, the way a street address identifies a house. "IP" stands for Internet Protocol — the agreed-upon rules computers use to send data to each other. Every device that joins a network gets an IP address so that traffic meant for it actually arrives at it and nowhere else.

A typical address looks like 192.168.1.42 or, in the newer format, something like 2001:0db8:85a3::8a2e:0370:7334. When you load a web page, your device puts its own IP address on the request as a return address, and the website's IP address as the destination. Without IP addresses, data would have no idea where to go.

What does an IP address look like? (format)

An IPv4 address is four numbers from 0 to 255, separated by dots — for example 192.168.1.42 or 203.0.113.5. Each of the four parts is called an octet. An IPv6 address looks very different: groups of letters and numbers separated by colons, like 2001:0db8:85a3::8a2e:0370:7334. Quick rule: four dotted numbers means IPv4; colons and hex digits means IPv6. That's the whole "format" in a sentence.

What's my IP address on Wi-Fi?

On Wi-Fi you still have the same two addresses. The one your router gives your device on the Wi-Fi network is your private IP (usually 192.168.x.x) — you'll find it in your phone's Wi-Fi details or your computer's network settings. The one the internet sees is your public IP, shared by everything on that Wi-Fi, and you can check it in one click with our free "what's my IP" tool.

Public vs private IP addresses

Here's a point that confuses almost everyone at first: you actually have two different IP addresses at once.

• Your private IP address identifies your device inside your own home or office network. It's handed out by your router and only has meaning behind your router. Common private ranges start with 192.168., 10., or 172.16. through 172.31.. Your laptop might be 192.168.1.42 while your phone is 192.168.1.43.
• Your public IP address is the single address the rest of the internet sees. It belongs to your router, assigned by your internet provider. Every device in your home shares this one public address when reaching the outside world.

Your router translates between the two automatically, a process called NAT (Network Address Translation). This is why a website sees one address for your whole household even though you have a dozen devices behind the router.

IPv4 vs IPv6

There are two versions of IP addresses in use today.

• IPv4 is the original and most familiar format: four numbers from 0 to 255, separated by dots, like 203.0.113.5. It allows about 4.3 billion addresses — which sounded like plenty in the 1980s but ran short as the world filled with connected devices.
• IPv6 is the newer format, designed to solve that shortage. It uses longer addresses written in hexadecimal with colons, like 2001:0db8:85a3::7334. The pool is so vast it's effectively unlimited. Many networks now run both at once, and your devices switch between them seamlessly.

For everyday purposes you don't need to choose; your device and provider sort it out. It's only useful to know the two formats exist so neither one surprises you.

Static vs dynamic IP addresses

Addresses can either stay fixed or change over time.

• Dynamic is the default for most homes. Your router (or provider) leases an address to each device for a while and may reassign it later. This is automatic, handled by a system called DHCP, and you never have to think about it. Your private addresses can shift when devices reconnect, and your public address may change occasionally.
• Static means an address is set permanently and never changes. This is useful for a device that needs to be found reliably — a printer, a home server, or a security camera. Home users sometimes assign a static private IP to such devices so they always live at the same number.

How to find your IP address

Finding both of your addresses is quick:

• Your public IP: search the web for "what is my IP" and the result page will show the address the internet sees for your whole network.
• Your private IP on Windows: open Settings, go to Network & Internet, then click your active connection and look for the IPv4 address — often something like 192.168.1.x.
• Your private IP on a Mac: open System Settings, choose Network, select your active connection, and the address is listed there.
• On a phone: the Wi-Fi settings screen usually shows the device's IP under the connected network's details.

Common confusions

• An IP address is not the same as a MAC address. The IP can change; the MAC address is a fixed hardware identifier baked into the device.
• Seeing 192.168.x.x doesn't mean you're "exposed." That's a private address, only visible inside your own network.
• A changing public IP is normal. Most home internet uses dynamic addresses, so yours shifting now and then is expected, not a problem.

The practical takeaway: your private IP places your device within your home network, and your public IP places your whole network on the internet. Knowing which one you're looking at clears up most of the confusion people run into.

Frequently asked questions