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.

10 hosts · 233 ms

HostCertsFirst seenLast seenDNS
ipko.pl 3 2025-07-11 2026-06-23 ok
m.ipko.pl 1 2025-12-05 2025-12-05 ok
www.m.ipko.pl 1 2025-12-05 2025-12-05 nodata
dealer.am.ipko.pl 2 2025-08-27 2026-08-05 ok
www.dealer.am.ipko.pl 2 2025-08-27 2026-08-05 nxdomain
wnioski.pm.ipko.pl 2 2025-08-27 2026-08-05 ok
www.wnioski.pm.ipko.pl 2 2025-08-27 2026-08-05 nxdomain
ekantor.pm.ipko.pl 2 2025-08-27 2026-08-05 nxdomain
www.ekantor.pm.ipko.pl 2 2025-08-27 2026-08-05 nxdomain
www.ipko.pl 3 2025-07-11 2026-06-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/ipko.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/ipko.pl.