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.

36 hosts · 361 ms

HostCertsFirst seenLast seenDNS
sektorcert.dk 27 2026-04-27 2026-09-24 ok
*.sektorcert.dk 27 2026-02-16 2026-09-24 —
stream01.sektorcert.dk 4 2026-05-17 2026-10-05 nxdomain
mattermost01.sektorcert.dk 5 2026-05-08 2026-09-04 nxdomain
mattermost02.sektorcert.dk 5 2026-05-08 2026-09-04 nxdomain
*.lab.sektorcert.dk 5 2026-04-27 2026-08-24 —
shield.sektorcert.dk 5 2026-05-05 2026-09-04 nxdomain
dashboard.sektorcert.dk 4 2026-05-15 2026-10-05 nxdomain
tls-log.remote.sektorcert.dk 4 2026-04-28 2026-04-28 ok
wiki.sektorcert.dk 2 2025-07-16 2026-06-16 ok
opencti.sektorcert.dk 5 2026-04-27 2026-08-24 ok
cloak.sektorcert.dk 7 2026-05-13 2026-10-05 nodata
devices.cloak.sektorcert.dk 4 2026-05-13 2026-10-05 nodata
services.cloak.sektorcert.dk 4 2026-05-13 2026-10-05 ok
helpdesk.sektorcert.dk 5 2026-05-06 2026-09-04 nxdomain
*.internal.sektorcert.dk 2 2026-04-27 2026-04-27 —
proxmox01.internal.sektorcert.dk 1 2026-08-06 2026-08-06 nxdomain
proxmox02.internal.sektorcert.dk 1 2026-08-06 2026-08-06 nxdomain
wiki.internal.sektorcert.dk 2 2025-07-16 2026-06-16 ok
fleet-portal.sektorcert.dk 4 2026-05-08 2026-10-05 ok
track.sl.sektorcert.dk 6 2026-04-20 2026-08-18 ok
threatcom.sektorcert.dk 5 2026-05-05 2026-09-04 nxdomain
misp.sektorcert.dk 5 2026-05-05 2026-09-04 ok
mattermost-backup.sektorcert.dk 4 2026-05-06 2026-10-05 ok
fleet.sektorcert.dk 4 2026-05-08 2026-10-05 ok
*.int.sektorcert.dk 5 2026-04-28 2026-08-25 —
proxmox01.int.sektorcert.dk 1 2026-08-06 2026-08-06 nxdomain
prx01.int.sektorcert.dk 2 2026-08-06 2026-08-09 nxdomain
proxmox02.int.sektorcert.dk 1 2026-08-06 2026-08-06 nxdomain
prx02.int.sektorcert.dk 1 2026-08-06 2026-08-06 nxdomain
uni-kbh.int.sektorcert.dk 1 2026-08-25 2026-08-25 nxdomain
fleet-portal-test.sektorcert.dk 5 2026-05-01 2026-08-28 ok
mattermost-test.sektorcert.dk 1 2026-08-11 2026-08-11 ok
mattermost.sektorcert.dk 5 2026-05-05 2026-09-04 ok
www.sektorcert.dk 2 2026-06-08 2026-08-09 ok
proxy.sektorcert.dk 4 2026-05-11 2026-10-05 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/sektorcert.dk (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/sektorcert.dk.