I have two questions mainly:
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Is there an existing tool like this? Or maybe even a built-in way to check on a per instance basis if it’s currently federated with another instance or not?
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What’s the default state of an instance once it starts up? I’m guessing open to all, and defederation has to be an intentional choice?
Overall I’m just curious. I don’t have the capability to code something like this myself, but I’d be pretty interested to check on the links between instances as the Fediverse grows.
I don’t know if there’s a site like that, but there are tools for looking at defederation and federation of a given instance:
1- In the main page of each instance there should be an “about” or “info” button that should contain a part with the list of blocked and limited instances. There could also be a “federation” or “instance” button.
(although I think that I page that collects and gives easier access to these list would be a great resource to have)
2- You can search #/Fediblock. There instance admins/mods (and also common users) from different instances and softwares of the fediverse publish news of defederation and blocking/muting and advise other instance admins/mods and common users to do the same.