Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

13 hosts · 230 ms

HostCertsFirst seenLast seenDNS
mikoto.co.jp 11 2026-04-21 2026-08-28 ok
*.mikoto.co.jp 7 2026-05-02 2026-08-28 —
cc-verify-568.mikoto.co.jp 1 2026-09-02 2026-09-02 ok
media.mikoto.co.jp 2 2026-09-11 2026-09-11 ok
links.send.mikoto.co.jp 3 2026-05-07 2026-10-07 ok
mail.mikoto.co.jp 14 2026-05-17 2026-09-12 ok
elink539.mail.mikoto.co.jp 10 2026-05-17 2026-09-12 ok
links.mail.mikoto.co.jp 2 2026-05-07 2026-10-07 ok
bluelamp-admin.mikoto.co.jp 5 2026-05-26 2026-09-28 ok
audio.mikoto.co.jp 2 2026-09-11 2026-09-11 ok
bluelamp.mikoto.co.jp 5 2026-05-26 2026-09-27 ok
mta-sts.mikoto.co.jp 4 2026-04-21 2026-08-19 ok
www.mikoto.co.jp 4 2026-04-21 2026-08-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mikoto.co.jp (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/mikoto.co.jp.