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.

8 hosts · 381 ms

HostCertsFirst seenLast seenDNS
paf.fi 15 2026-05-17 2026-09-12 ok
*.paf.fi 15 2026-05-17 2026-09-12 —
maintenance.paf.fi 10 2026-04-30 2026-08-26 ok
gtm.paf.fi 3 2026-05-12 2026-08-27 ok
resources.paf.fi 10 2026-04-30 2026-08-26 ok
colossus.paf.fi 1 2025-11-27 2025-11-27 ok
support.paf.fi 7 2026-05-23 2026-08-20 ok
identity.paf.fi 5 2026-05-05 2026-09-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/paf.fi (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/paf.fi.