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.

17 hosts · 206 ms

HostCertsFirst seenLast seen
sinful.dk 9 2026-05-06 2026-09-03
*.sinful.dk 4 2026-08-19 2026-08-26
job.sinful.dk 10 2026-05-16 2026-09-24
staffpurchase.sinful.dk 4 2026-04-21 2026-08-19
love.sinful.dk 5 2026-05-05 2026-09-02
hinfogzi.sinful.dk 5 2026-04-24 2026-08-22
load.hinfogzi.sinful.dk 14 2026-04-15 2026-10-09
trk.sinful.dk 4 2026-04-18 2026-08-16
emtrk.sinful.dk 4 2026-04-20 2026-08-18
spil.sinful.dk 2 2026-04-19 2026-09-19
retool.sinful.dk 1 2025-12-07 2025-12-07
www.december.sinful.dk 2 2026-03-14 2026-08-14
kalorieberegner.sinful.dk 5 2026-05-05 2026-09-02
s.sinful.dk 6 2026-06-05 2026-08-04
mta-sts.sinful.dk 5 2026-05-26 2026-09-23
www.sinful.dk 5 2026-05-06 2026-09-03
legacy.sinful.dk 5 2026-04-29 2026-08-27

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