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.

3 hosts · 225 ms

HostCertsFirst seenLast seen
pkobh.pl 3 2025-08-13 2026-08-13
autodiscover.pkobh.pl 1 2026-05-08 2026-05-08
www.pkobh.pl 3 2025-08-13 2026-08-13

Programmatic access: API GET /v1/hosts/pkobh.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/pkobh.pl.