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.

7 hosts · 291 ms

HostCertsFirst seenLast seenDNS
keyforher.com 32 2026-04-17 2026-10-03 ok
*.keyforher.com 10 2026-05-20 2026-10-03 —
bimi.keyforher.com 6 2026-07-20 2026-09-18 ok
*.bimi.keyforher.com 6 2026-07-20 2026-09-18 —
learn.keyforher.com 8 2026-05-03 2026-08-30 ok
*.learn.keyforher.com 8 2026-05-03 2026-08-30 —
www.keyforher.com 13 2026-04-16 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/keyforher.com (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/keyforher.com.