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.

6 hosts · 337 ms

HostCertsFirst seenLast seenDNS
rxintel.app 4 2026-04-27 2026-09-13 ok
staging.rxintel.app 5 2026-05-23 2026-09-20 ok
api.rxintel.app 5 2026-05-24 2026-09-21 ok
app.rxintel.app 5 2026-05-24 2026-09-21 ok
status.rxintel.app 5 2026-05-10 2026-09-07 ok
www.rxintel.app 4 2026-04-27 2026-09-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/rxintel.app (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/rxintel.app.