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.

8 hosts · 217 ms

Download CSV
HostCertsFirst seenLast seen
fna.fi 14 2026-04-23 2026-10-15
*.fna.fi 7 2026-06-06 2026-10-03
staging2.fna.fi 4 2026-05-08 2026-07-07
events.fna.fi 6 2026-07-17 2026-09-14
trust.fna.fi 13 2026-06-02 2026-09-28
nasu.fna.fi 5 2026-04-30 2026-08-23
www.nasu.fna.fi 5 2026-04-30 2026-08-23
www.fna.fi 6 2026-04-23 2026-10-15

Programmatic access: API GET /v1/hosts/fna.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/fna.fi.