Online IPv6 Ping and Port Scanner
ipv6.chappell-family.com/ipv6tcptest
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
/3), irrespective of your IPv6 provider or device operating system. See the default port list. So far over 5361 portscans of IPv6 hosts have been completed.