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 · 269 ms

HostCertsFirst seenLast seenDNS
qanapi.us 15 2026-04-20 2026-09-29 ok
*.qanapi.us 15 2026-04-20 2026-09-29 —
tools.qanapi.us 17 2026-05-16 2026-09-01 ok
support.qanapi.us 5 2026-05-02 2026-08-30 ok
onedev.qanapi.us 11 2026-04-20 2026-10-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/qanapi.us (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/qanapi.us.