What Is an IP Address? A Plain-English Explanation

Every device that connects to the internet — your phone, laptop, smart TV, even your doorbell camera — needs an address so data knows where to go. That address is the IP address (Internet Protocol address). When you open a website, your device sends a request stamped with your IP, and the website sends the page back to that same address, exactly like a return address on an envelope.

What an IP address looks like

There are two formats in use today:

• IPv4 — four numbers from 0–255 separated by dots, e.g. 203.0.113.42. This is the classic format most people recognise.
• IPv6 — eight groups of hexadecimal characters separated by colons, e.g. 2001:db8:85a3::8a2e:370:7334. It exists because the world ran out of IPv4 addresses.

You can see which one your connection is using right now on our IP checker — it detects both automatically.

Who gives you your IP address?

Your internet service provider (ISP) assigns your public IP when your router connects. ISPs receive large blocks of addresses from regional registries (like ARIN in North America or RIPE in Europe), which in turn get them from IANA, the global coordinator. That chain is why an IP can be traced back to a provider and an approximate region — the allocation is public record.

Public vs private addresses

Inside your home, your router runs its own mini-network. It gives each device a private address (usually starting with 192.168. or 10.) and shares one public address with the outside world. Websites only ever see the public one. If you want the full breakdown, read public vs private IP addresses.

What your IP reveals

Your public IP exposes more than most people expect:

• Your approximate location — usually the city or region, via geolocation databases.
• Your internet provider and connection type (home broadband, mobile, business, datacenter).
• A persistent identifier that websites and advertisers can use to recognise you across visits.

It does not directly reveal your name or street address — but your ISP can match an IP to an account, and courts can order them to do so.

Does my IP address ever change?

Usually, yes. Most home connections use dynamic addresses that rotate when your router reconnects or after a lease period. Businesses often pay for a static IP that never changes. See static vs dynamic IPs for when each matters.

Frequently asked questions