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.

5 hosts · 202 ms

HostCertsFirst seenLast seenDNS
adam.jp 1 2025-10-15 2025-10-15 ok
*.adam.jp 8 2026-03-05 2026-07-22 —
stg.adam.jp 3 2025-10-15 2026-09-08 ok
www.stg.adam.jp 2 2026-04-08 2026-09-08 ok
support.adam.jp 4 2026-04-25 2026-06-24 ok

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