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.

13 hosts · 260 ms

HostCertsFirst seenLast seen
m20.e.circlekextra.dk 2 2025-06-16 2026-05-17
res20.e.circlekextra.dk 2 2025-06-16 2026-05-17
t20.e.circlekextra.dk 2 2025-06-16 2026-05-17
res19.e.circlekextra.dk 2 2026-03-19 2026-08-19
web.e.circlekextra.dk 2 2025-06-16 2026-05-17
m.e.circlekextra.dk 2 2025-06-16 2026-05-17
res.e.circlekextra.dk 4 2026-03-18 2026-08-18
t.e.circlekextra.dk 2 2025-06-16 2026-05-17
*.s.circlekextra.dk 4 2025-06-16 2026-05-17
res19.s.circlekextra.dk 2 2026-03-19 2026-08-19
m.s.circlekextra.dk 2 2026-03-18 2026-08-18
res.s.circlekextra.dk 2 2026-03-18 2026-08-18
t.s.circlekextra.dk 2 2026-03-18 2026-08-18

Programmatic access: API GET /v1/hosts/circlekextra.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/circlekextra.dk.