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 · 259 ms

HostCertsFirst seenLast seenDNS
alan.eu 8 2026-05-28 2026-09-24 ok
*.alan.eu 8 2026-05-28 2026-09-24 —
move.alan.eu 3 2026-07-31 2026-09-29 ok
trail.alan.eu 4 2026-05-24 2026-07-23 nxdomain
meetings.alan.eu 8 2026-04-25 2026-08-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/alan.eu (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/alan.eu.