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.

8 hosts · 301 ms

HostCertsFirst seenLast seenDNS
momotaro.co.jp 2 2026-01-09 2026-01-09 ok
auth.momotaro.co.jp 6 2026-04-10 2026-09-26 ok
member.momotaro.co.jp 6 2026-04-10 2026-09-26 ok
recruit.momotaro.co.jp 5 2026-05-09 2026-09-06 ok
test.recruit.momotaro.co.jp 5 2026-05-13 2026-09-10 ok
www.recruit.momotaro.co.jp 5 2026-05-09 2026-09-06 ok
event.momotaro.co.jp 29 2025-07-01 2026-10-02 ok
www.momotaro.co.jp 2 2026-01-09 2026-01-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/momotaro.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/momotaro.co.jp.