IPv6

An IPv6 address is a 128 bit hexadecimal number, and is the second major in-use revision of the TCP-IP protocol. It's far more common than IPv4, and is generally cheap or even free to get depending on where you go for the addresses. An IPv6 address is formatted like this 2602:fba2:feed:feed:feed:feed:feed:feed with each octet being able to take hex, so anything from 0-9 and a thru f.

LIRs and some other services often give away subnets of IPv6.