Mitra [v4.3.0](https://mitra.social/objects/0196e556-9f45-3dcf-ae82-c742f41bae4a ) includes support for IPv6 hosts and can federate with Yggdrasil servers.
RE: https://mastodon.social/users/yggverse/statuses/114529358439259745
Testing the local #Yggdrasil federation:
http://[201:247c:41e9:5c8f:a612:2818:5e9a:e868]/MadaMada
http://[302:68d0:f0d5:b88d::fed]/ps