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.

12 hosts · 328 ms

HostCertsFirst seenLast seenDNS
ekookna.pl 2 2026-05-04 2026-08-19 ok
*.ekookna.pl 3 2026-05-04 2026-08-27 —
mwgwheelchairapi.ekookna.pl 5 2026-05-05 2026-09-20 ok
pracownik.ekookna.pl 2 2026-08-12 2026-08-12 ok
test-pracownik.ekookna.pl 2 2026-08-10 2026-08-10 ok
apidladziwnychurzadzen.ekookna.pl 5 2026-05-08 2026-09-23 ok
eko4u.ekookna.pl 2 2026-04-22 2026-04-22 nxdomain
www.eko4u.ekookna.pl 2 2026-04-22 2026-04-22 —
link.no-reply.ekookna.pl 14 2026-06-03 2026-10-02 ok
*.link.no-reply.ekookna.pl 14 2026-06-03 2026-10-02 —
n.no-reply.ekookna.pl 14 2026-06-03 2026-10-01 ok
*.n.no-reply.ekookna.pl 14 2026-06-03 2026-10-01 —

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