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.

14 hosts · 201 ms

HostCertsFirst seenLast seen
rh.aok.de 4 2025-08-06 2026-06-10
*.rh.aok.de 1 2025-11-06 2025-11-06
rl0.rh.aok.de 2 2025-12-04 2025-12-19
rl1.rh.aok.de 2 2025-12-04 2025-12-19
avconf.uc.rh.aok.de 1 2025-09-19 2025-09-19
www.babyfreude.rh.aok.de 7 2026-05-26 2026-10-02
feedback.umfrage.rh.aok.de 5 2026-05-20 2026-09-23
mail.rh.aok.de 3 2025-09-23 2026-10-01
smtp.rh.aok.de 3 2025-09-23 2026-10-01
schwangerschaftsnewsletter.rh.aok.de 5 2026-04-28 2026-08-27
autodiscover.rh.aok.de 3 2025-09-23 2026-10-01
cx-test.rh.aok.de 1 2026-09-14 2026-09-14
www.rh.aok.de 1 2026-06-10 2026-06-10
cx.rh.aok.de 1 2026-09-14 2026-09-14

Programmatic access: API GET /v1/hosts/rh.aok.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/rh.aok.de.