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.

3 hosts · 268 ms

HostCertsFirst seenLast seenDNS
*.metlife.pl 1 2025-12-26 2025-12-26 —
qa.ipac.metlife.pl 1 2026-02-09 2026-02-09 nxdomain
www.metlife.pl 6 2025-07-22 2025-12-10 ok

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