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.

9 hosts · 253 ms

HostCertsFirst seenLast seenDNS
jyskeinvest.dk 28 2026-04-28 2026-10-01 ok
*.jyskeinvest.dk 18 2026-05-16 2026-10-01 —
alpha.jyskeinvest.dk 6 2026-06-19 2026-08-17 ok
ji.jyskeinvest.dk 3 2026-06-12 2026-08-21 ok
dok.jyskeinvest.dk 22 2026-04-22 2026-08-21 ok
sip.jyskeinvest.dk 1 2026-02-02 2026-02-02 ok
lyncdiscover.jyskeinvest.dk 1 2026-02-03 2026-02-03 ok
preview.jyskeinvest.dk 10 2026-04-28 2026-08-24 ok
www.jyskeinvest.dk 11 2026-04-28 2026-08-24 ok

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