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.

7 hosts · 231 ms

HostCertsFirst seenLast seenDNS
portalsQA1.metlife.com.pt 2 2026-04-30 2026-04-30 —
portalsqa1.metlife.com.pt 8 2026-05-12 2026-09-29 ok
portalsQA.metlife.com.pt 3 2026-02-27 2026-09-04 —
portalsqa.metlife.com.pt 10 2026-04-19 2026-09-29 ok
portalsqaapi.metlife.com.pt 2 2026-09-17 2026-09-29 nxdomain
qa.ssologin.metlife.com.pt 1 2025-12-10 2025-12-10 ok
extramet.metlife.com.pt 11 2025-12-15 2026-09-21 ok

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