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.

5 hosts · 354 ms

HostCertsFirst seenLast seenDNS
pcso.gov.ph 3 2026-03-06 2026-05-05 ok
*.pcso.gov.ph 3 2026-03-06 2026-05-05 —
fortigate.pcso.gov.ph 4 2026-04-14 2026-08-12 ok
lottomatik.pcso.gov.ph 10 2026-05-11 2026-09-06 ok
sukilotto.pcso.gov.ph 1 2026-07-09 2026-07-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pcso.gov.ph (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/pcso.gov.ph.