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.

5 hosts · 253 ms

HostCertsFirst seenLast seen
cert.orange.pl 4 2026-03-19 2026-08-31
sh.cert.orange.pl 6 2026-05-30 2026-10-03
alert.cert.orange.pl 2 2026-03-19 2026-08-31
www.alert.cert.orange.pl 2 2026-03-19 2026-08-31
www.cert.orange.pl 4 2026-03-19 2026-08-31

Programmatic access: API GET /v1/hosts/cert.orange.pl (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/cert.orange.pl.