What is an IP Address?

An IP address (Internet Protocol address) is a unique number assigned to every device on a network. It works like a postal address for data--letting information find the right device to and from. Without an IP address, a device cannot send or receive anything on the internet.

IPv4 and IPv6

Two versions of the IP protocol are in use today:

• IPv4: 32-bit addresses like 192.0.2.1, about 4.3 billion in total. IPv4 addresses have effectively run out due to the internet's explosive growth.
• IPv6: 128-bit addresses like 2001:db8::1, virtually unlimited, designed to replace IPv4.

How IP Addresses Are Assigned

When you connect, your Internet Service Provider (ISP) assigns a public IP to your router. The router then uses DHCP to give each of your devices a private IP. Websites see your public IP; private IPs never appear on the public internet.

How to Find My IP

Visit IP Lookup and the page automatically shows your public IPv4 and IPv6 addresses--no action required.