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 · 258 ms

HostCertsFirst seenLast seenDNS
primalqueen.com 15 2026-04-12 2026-10-06 ok
*.primalqueen.com 7 2026-04-12 2026-10-06 —
trk.send.primalqueen.com 12 2026-06-01 2026-09-28 ok
mta-sts.primalqueen.com 2 2026-05-18 2026-07-28 ok
www.primalqueen.com 4 2026-04-16 2026-08-13 ok
privacy.primalqueen.com 6 2026-04-27 2026-09-09 ok
try.primalqueen.com 11 2026-06-01 2026-09-27 ok

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