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.

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zunda

twitter.comさんとx.comさんはサーバ証明書が同一なのがおもしろいよねえSafariさんとかだとTLS切らずにリダイレクトされそうだよねえ

$ :| openssl s_client -connect x.com:443 -servername x.com 2>/dev/null | openssl x509 -noout -serial
serial=04E1056104670BD06CDF33A38B67A431
$ :| openssl s_client -connect twitter.com:443 -servername twitter.com 2>/dev/null | openssl x509 -noout -serial
serial=04E1056104670BD06CDF33A38B67A431

って思ったらDNSが微妙に違うw

$ dig +short x.com
104.244.42.1
$ dig +short twitter.com
104.244.42.1
104.244.42.65
104.244.42.193
104.244.42.129