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 · 335 ms

HostCertsFirst seenLast seen
fairssl.dk 6 2026-01-18 2026-02-19
autodiscover.fairssl.dk 1 2026-01-08 2026-01-08
analytics.fairssl.dk 1 2026-10-08 2026-10-08
status.fairssl.dk 4 2026-04-19 2026-08-25
support.fairssl.dk 2 2026-10-05 2026-10-08
www.webflow.fairssl.dk 8 2026-05-16 2026-09-11
www.fairssl.dk 6 2026-01-18 2026-02-19

Programmatic access: API GET /v1/hosts/fairssl.dk (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/fairssl.dk.