There’s a method to the madness

Which of these is a valid IPv6 address? Pick just one.

A) fe80::5d18:652:cffd:8f52

B) fe80::0122:8h4a:d00a:9011

C) fe80::1002:20b1::d22:cc9a

D) fe80:0000:0000:0000:4244:12ab:cfff:0112:6abb

E) Just throw together a lot of numbers and letters

The answer: A) fe80::5d18:652:cffd:8f52

IPv6 addresses are 128 bits, and represented with eight groups of four hexadecimal digits, separated by colons. Double colons are used to abbreviate groups of zeros, and leading zeros in a group can be removed. Hexadecimal values include the numbers 0 through 9, and the letters a through f. You can only have one set of double colons in a single IPv6 address.

Want to know more? Watch “IPv4 and IPv6.”

Although IPv4 has been the most popular protocol in the world, IPv6 has now become a standard installation in Windows 7. In this video, you’ll learn how to identify IPv4 addresses and IPv6 addresses, and how IPv6 addresses can be abbreviated to save space and make them more readable.