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.

3 hosts · 248 ms

HostCertsFirst seenLast seenDNS
skeb.jp 9 2026-06-15 2026-09-23 ok
*.skeb.jp 6 2026-06-12 2026-09-20 —
*.private.skeb.jp 5 2026-05-03 2026-08-31 —

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