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.

4 hosts · 232 ms

HostCertsFirst seenLast seenDNS
basicclean.dk 26 2026-04-20 2026-09-05 ok
*.basicclean.dk 21 2026-04-20 2026-09-05 —
autoconfig.basicclean.dk 4 2026-04-14 2026-08-12 ok
www.basicclean.dk 5 2026-04-27 2026-08-25 ok

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