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 · 262 ms

HostCertsFirst seenLast seenDNS
la-uat03.metlife.cn 1 2026-03-16 2026-03-16 nxdomain
cross.metlife.cn 1 2026-05-29 2026-05-29 nxdomain
ccs-uat.metlife.cn 1 2026-02-05 2026-02-05 nxdomain

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