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.

28 hosts · 398 ms

HostCertsFirst seenLast seenDNS
skr.de 6 2026-04-29 2026-09-07 ok
kunden-portal-qa.skr.de 1 2026-07-06 2026-07-06 nxdomain
smkynb.skr.de 2 2026-05-23 2026-08-02 ok
sbc.skr.de 2 2025-09-09 2026-10-06 ok
www.sbc.skr.de 2 2025-09-09 2026-10-06 nxdomain
metabase.skr.de 4 2026-02-23 2026-10-07 ok
meeting.skr.de 10 2026-05-25 2026-09-22 ok
wiki.skr.de 6 2026-04-29 2026-09-07 ok
api.skr.de 3 2025-07-02 2026-07-07 ok
portal.skr.de 1 2026-07-29 2026-07-29 ok
kunden-portal.skr.de 1 2026-07-06 2026-07-06 nxdomain
destination-portal.skr.de 3 2026-05-16 2026-09-29 ok
qa.destination-portal.skr.de 3 2026-05-16 2026-09-30 ok
feature.destination-portal.skr.de 2 2026-08-14 2026-08-14 ok
qa.portal.skr.de 1 2026-07-29 2026-07-29 ok
manager.skr.de 3 2026-05-26 2026-10-07 ok
qa.manager.skr.de 2 2026-01-09 2026-06-01 ok
feature.manager.skr.de 4 2026-05-10 2026-09-22 ok
dev.manager.skr.de 2 2026-01-10 2026-05-29 ok
forms.skr.de 10 2026-05-17 2026-09-14 ok
mta-sts.skr.de 2 2026-02-24 2026-07-12 ok
sst.skr.de 3 2026-02-19 2026-10-03 ok
repru.skr.de 2 2026-02-22 2026-06-14 nxdomain
dev.repru.skr.de 2 2026-02-21 2026-06-13 nxdomain
www.skr.de 6 2026-04-29 2026-09-07 ok
survey.skr.de 8 2026-04-11 2026-08-09 ok
delivery.skr.de 3 2026-02-21 2026-10-05 ok
dev.delivery.skr.de 3 2026-02-21 2026-10-06 ok

Programmatic access, with DNS A records: API GET /v1/hosts/skr.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/skr.de.