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 · 224 ms

HostCertsFirst seenLast seenDNS
simas-oeiras-amadora.pt 1 2025-11-08 2025-11-08 nodata
*.simas-oeiras-amadora.pt 1 2025-11-08 2025-11-08 —
vpn.simas-oeiras-amadora.pt 4 2026-04-15 2026-08-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/simas-oeiras-amadora.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/simas-oeiras-amadora.pt.