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 · 233 ms

HostCertsFirst seenLast seenDNS
cescodigital.pr.gov 11 2025-08-01 2026-09-11 ok
*.cescodigital.pr.gov 13 2025-07-16 2026-09-11 —
www.credenciales.cescodigital.pr.gov 11 2025-08-01 2026-09-11 ok

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