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What Is My IP Address?

For your information, your IP address does not appear on any of the real-time blocklists (RBLs) checked. Find out more about real-time blocklists...

What Is An IP Address?

An IP address is similar to your telephone number. It is a 32-bit number written as 4 sets of numbers seperated by a period. The address uniquely identifies a node (e.g. your computer) on a network. There are two main types of IP address, public & private.

Public IP Address

A public IP address is typically assigned to you by your Internet Service Provider (ISP). It should, in theory atleast, be accessible from anywhere on the Internet.

Private IP Addresses

Some ranges of IP addresses have been marked as private or non-routable. This means they cannot be used on the Internet and are therefore 'safe' for use in more than one location for internal networks.

The private IP ranges for internal networks are,

• 10.0.0.0 to 10.255.255.255
• 172.16.0.0 to 172.31.255.255
• 192.168.0.0 to 192.168.255.255

Address beginning with 192.168. are typically used by home networks.

Automatic Private IP Addressing

Automatic Private IP Addressing (APIPA) is a feature used by later versions of Microsoft Windows to self-configure itself with an IP address when a DHCP server isn't available. The APIPA IP address range is 69.254.0.0 to 169.254.255.255. If your computer has an IP address within this range there is typically something wrong with the network.

Localhost

The IP address 127.0.0.1 is used to test the TCP/IP stack on the local computer or by an application to connect to another service on the local computer.