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.

10 hosts · 288 ms

HostCertsFirst seenLast seenDNS
strauss.at 5 2026-04-21 2026-10-07 ok
www-qa.strauss.at 6 2026-05-05 2026-10-07 ok
www-sta.strauss.at 6 2026-05-05 2026-10-07 ok
presse.strauss.at 16 2026-05-21 2026-10-02 ok
gutschein.strauss.at 13 2026-05-01 2026-10-01 ok
mail.gutschein.strauss.at 1 2026-09-14 2026-09-14 ok
www.gutschein.strauss.at 13 2026-05-01 2026-10-01 ok
help.strauss.at 7 2026-04-22 2026-09-27 ok
www-dev.strauss.at 6 2026-05-05 2026-10-07 ok
www.strauss.at 5 2026-04-21 2026-10-07 ok

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