IPv6 support is currently only available for connect() scan (
-sT), ping scan (
-sP), and list scan (
OS detection and decoys are also not supported with IPv6.
nmap's internal DNS resolver does not support IPv6 transport or AAAA records. You must use
--system-dns for DNS resolution.
4.90 has improved IPv6 support. Specifically:
"Nmap can now handle -SP and -SA at the same time when running nmap as non-root or using IPv6. It now combines the two port lists"