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.

4 hosts · 258 ms

HostCertsFirst seenLast seenDNS
tulotero.pt 1 2025-12-29 2025-12-29 ok
web.tulotero.pt 2 2026-03-01 2026-07-17 ok
fp.web.tulotero.pt 2 2025-07-01 2026-06-01 ok
www.tulotero.pt 1 2025-12-29 2025-12-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tulotero.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/tulotero.pt.