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.

12 hosts · 330 ms

HostCertsFirst seenLast seenDNS
hwk-mittelfranken.de 31 2026-02-07 2026-08-23 ok
*.hwk-mittelfranken.de 15 2026-02-07 2026-08-17 —
service.hwk-mittelfranken.de 2 2026-04-06 2026-09-21 ok
mta-sts.service.hwk-mittelfranken.de 28 2026-04-26 2026-08-23 ok
e-learning.hwk-mittelfranken.de 5 2026-04-23 2026-08-21 ok
berufsbildung.hwk-mittelfranken.de 5 2026-05-19 2026-09-17 ok
bimi.hwk-mittelfranken.de 28 2026-05-11 2026-09-07 ok
kundenportal.hwk-mittelfranken.de 1 2026-09-14 2026-09-14 ok
newsletter.hwk-mittelfranken.de 7 2026-06-03 2026-10-01 ok
mta-sts.hwk-mittelfranken.de 16 2026-04-26 2026-08-23 ok
news.hwk-mittelfranken.de 7 2026-06-03 2026-10-01 ok
www.hwk-mittelfranken.de 12 2026-04-26 2026-08-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hwk-mittelfranken.de (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/hwk-mittelfranken.de.