What Is an IP Address?
Learn what an IP address is, the difference between IPv4 and IPv6, public vs private IPs, and how geolocation works — in plain English.
By the ToolsHub team · Updated May 1, 2026
An IP address (Internet Protocol address) is a unique label assigned to every device on a network. It works like a postal address: it tells data where to go and where it came from. Without IP addresses, computers couldn't find each other on the internet.
IPv4 vs IPv6
IPv4 addresses look like 122.161.73.71 — four numbers (0–255) separated by dots, giving about 4.3 billion possible addresses. Because the world ran out of those, IPv6 was introduced, using longer addresses like 2001:0db8:85a3::8a2e:0370:7334 for a virtually unlimited pool.
Public vs private IP addresses
- Public IP — assigned by your ISP and visible to the internet. This is what websites see when you visit them.
- Private IP — used inside your home or office network (e.g.
192.168.x.x). It isn't reachable directly from the internet.
What can an IP reveal?
An IP address can be mapped to an approximate geographic location (city, region, country) and your ISP — a process called IP geolocation. It is approximate, not a precise street address, and can be masked with a VPN or proxy.
How to find and protect your IP
To see your own public IP, the quickest way is our What's My IP tool, which also shows the approximate location and ISP that a website would see. If you want to look up where a different address is based, the IP Address Lookup tool reports geolocation, network owner and reverse DNS for any IP.
Because your public IP is visible to every site you visit, it can be used for rough location and for rate-limiting or blocking. A VPN or proxy hides it by routing your traffic through another server, so sites see that server's address instead of yours. That improves privacy but doesn't make you fully anonymous — cookies and logins still identify you.
Frequently asked questions
- What is my IP address?
- Your public IP is the address your internet provider assigns to your connection, and it's visible to the websites you visit. You can see yours, along with its approximate location and ISP, using our What's My IP tool.
- What is the difference between a public and private IP?
- A public IP identifies your whole network on the internet, while private IPs like 192.168.x.x are used inside your home or office network. Your router translates between them using NAT.
- Can an IP address reveal my exact location?
- No. IP geolocation usually pinpoints your city or region and your ISP, not your street address. It's an estimate drawn from databases, and a VPN or proxy can change it entirely.
- What is the difference between IPv4 and IPv6?
- IPv4 uses 32-bit addresses like 122.161.73.71 and offers about 4.3 billion of them, which the world exhausted. IPv6 uses much longer 128-bit addresses for a practically unlimited supply.