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.

6 hosts · 191 ms

HostCertsFirst seenLast seen
feny24.hu 5 2026-04-28 2026-08-26
xtg.feny24.hu 8 2026-06-08 2026-10-04
news.feny24.hu 5 2026-05-15 2026-09-12
support.feny24.hu 10 2026-04-22 2026-08-18
collector.sst.feny24.hu 4 2026-06-12 2026-10-10
www.feny24.hu 5 2026-04-28 2026-08-26

Programmatic access: API GET /v1/hosts/feny24.hu (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/feny24.hu.