Found this website today with a list of 2687 Mastodon instances, it also has a database dump! sp3r4z.fr/mastodon/

@bouke This website looks useful! I wonder when instances get listed on it. I also found that you can get a list of "peers" from the API of an instance. For example: mastodon.social/api/v1/instanc gives a list of ~4600 mastodon instances. However, a large parts of them seems to be offline.

@jantrienes yes I also saw that, it seems they are also using that endpoint, their code is also online but I have not looked extensively into that... There is also this site: mastopeek.app-dist.eu

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