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.

3 hosts · 204 ms

HostCertsFirst seenLast seen
fairssl.se 6 2026-01-18 2026-02-19
analytics.fairssl.se 1 2026-10-08 2026-10-08
www.fairssl.se 6 2026-01-18 2026-02-19

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