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.

9 hosts · 317 ms

HostCertsFirst seenLast seenDNS
hoermann.at 13 2026-04-19 2026-09-30 ok
at01.hoermann.at 3 2026-05-11 2026-09-04 ok
farbaktion.hoermann.at 25 2026-04-19 2026-09-30 ok
staging-farbaktion.hoermann.at 10 2026-05-28 2026-09-28 ok
ep.hoermann.at 13 2026-04-19 2026-09-30 ok
staging-ep.hoermann.at 5 2026-05-16 2026-09-14 ok
partner.hoermann.at 11 2026-04-11 2026-09-17 ok
at01preview.hoermann.at 3 2026-05-11 2026-09-04 ok
www.hoermann.at 13 2026-04-19 2026-09-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hoermann.at (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/hoermann.at.