Each instance has a publicly visible lists of “Linked Instances” and “Blocked” Instances. I’m curious to see a “Blocked By” list showing which instances have blocked a particular instance. Is that information readily available anywhere?
If possible, it would be interesting to have this information on an instance’s Instances page. The attached picture is an example I cooked up.
As the fediverse grows, I’m sure you’ll start to see instances that shadow-ban others. An easy way would be firewall rules, but there are others.
In the meantime, you can use a 3rd party tool https://fba.ryona.agency/?domain=lemmygrad.ml
Thanks for the link. That tool is what I’m looking for.
At most you could probably list instances that the current instance tried to federate with but failed. Since instances only try to federate with instances where users have a subscription to a community on the other instance there might be instances out there that just never even tried to federate with a given instance that still have it blocked.