@kissane @LLS For the servers that don't publish block lists, would it be feasible to ping them from one account each from a list of known servers to at least build a partial connection web?
Realistically tho? My immediate concern is someone loudly asserting that compiling this info or publishing any confirmation of what servers do or don't federate with each other constitutes a "privacy violation" and trying to get the whole project shut down on those grounds.