Woooo, no more worries about subnetting, all hail the wonderful and powerful Hex Based Ipv6! By the way, I believe Ipv6 will be able to handle 65 536^8 = 3.40282367 × 10^38. The 65,536 from 2^16 and then, 65,536^ 8 due to the 8 segments it's broken into. Simply Amazing...

http://www.raiden.net/techhelp/intro-ipv6.htm