Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

5 hosts · 269 ms

HostCertsFirst seenLast seen
martin-baker.com 18 2026-04-26 2026-09-15
*.martin-baker.com 14 2026-04-26 2026-08-22
AutoDiscover.martin-baker.com 1 2025-10-06 2025-10-06
mta-sts.martin-baker.com 2 2025-09-16 2026-08-17
www.martin-baker.com 4 2026-05-14 2026-09-15

Programmatic access: API GET /v1/hosts/martin-baker.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/martin-baker.com.