mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

Administered by:

Server stats:

1
active users

zunda

@kuroringo 問題のある環境で

$ dig +trace mastodon-japan.net

みたいなコマンドを発行してもらうと、

mastodon-japan.net. 60 IN A 27.133.133.36
;; Received 63 bytes from 172.64.33.78#53(buck.ns.cloudflare.com) in 20 ms

みたいに誰が返事をくれたかわかるかもですねー。