nmap 6 was released earlier today, which is a major upgrade to the old version of nmap. One feature that excites me in particular is "full IPv6 support", including OS fingerprinting.
In order to efficiently scan IPv6 networks, nmap added multicast requests to enumerate live hosts on a network.
For more details, see http://nmap.org/6Defending Web Applications Security Essentials - SANS San Francisco Spring 2020
May 22nd 2012
7 years ago