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 · 263 ms

HostCertsFirst seenLast seen
tensori.fi 4 2026-04-17 2026-09-04
admin.tensori.fi 5 2026-04-22 2026-09-09
www.admin.tensori.fi 5 2026-04-22 2026-09-09
status.tensori.fi 4 2026-06-11 2026-10-08
www.tensori.fi 4 2026-04-17 2026-09-04
matrix.tensori.fi 1 2026-08-14 2026-08-14
matrix-rtc.matrix.tensori.fi 1 2026-08-14 2026-08-14

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