List of Known Mastodon instances

There is also a list at instances.mastodon.xyz showing realtime information about instances.

Name	Theme/Notes, if applicable	Open Registrations	IPv6
mastodon.social	Flagship, quick updates	Yes	No
awoo.space	Intentionally moderated, only federates with mastodon.social	Yes	No
social.tchncs.de	N/A	Yes	No
animalliberation.social	Animal Rights	Yes	No
socially.constructed.space	Single user	No	No
epiktistes.com	N/A	Yes	No
fern.surgeplay.com	Federates everywhere, Minecraft-focused	Yes	No
gay.crime.team	the place for doin' gay crime online (please don't actually do crime here)	Yes	No
icosahedron.website	Icosahedron-themed (well, visually), open registration.	Yes	No
memetastic.space	Memes	Yes	No
social.diskseven.com	Single user	No	No (DNS entry but no response)
social.gestaltzerfall.net	Single user	No	No
mastodon.xyz	N/A	Yes	Yes
social.targaryen.house	Federates everywhere, quick updates.	Yes	Yes
social.mashek.net	Themed and customised for Mashekstein Labs community. Selectively federates.	Yes	No
masto.themimitoof.fr	N/A	Yes	Yes
social.imirhil.fr	N/A	No	Yes
social.wxcafe.net	Open registrations, federates everywhere, no moderation yet	Yes	Yes
octodon.social	Open registrations, federates everywhere, cutest instance yet	Yes	Yes
hostux.social	N/A	Yes	Yes
social.alex73630.xyz	Francophones	Yes	Yes
maly.io	N/A	Yes	No
social.lou.lt	N/A	Yes	No
mastodon.ninetailed.uk	N/A	Yes	No
soc.louiz.org	"Coucou"	Yes	No
7nw.eu	N/A	Yes	No
mastodon.gougere.fr	N/A	Yes	No
aleph.land	N/A	Yes	No
share.elouworld.org	N/A	No	No
social.lkw.tf	N/A	No	No
manowar.social	N/A	No	No
social.ballpointcarrot.net	Down at time of entry	No	No
mastodon.cc	Art	Yes	No

Let me know if you start running one so I can add it to the list! (Alternatively, add it yourself as a pull request).