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.

7 hosts · 244 ms

HostCertsFirst seenLast seen
anchorsbook.com 38 2026-05-07 2026-09-30
*.anchorsbook.com 33 2026-05-09 2026-09-30
staging.anchorsbook.com 5 2026-05-20 2026-09-19
testing.anchorsbook.com 3 2026-07-21 2026-09-20
host.anchorsbook.com 3 2026-06-03 2026-08-10
dev.anchorsbook.com 4 2026-04-21 2026-08-21
www.anchorsbook.com 5 2026-05-07 2026-09-06

Programmatic access: API GET /v1/hosts/anchorsbook.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/anchorsbook.com.