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 · 266 ms

HostCertsFirst seenLast seenDNS
pascuccicoffee.com 11 2026-04-29 2026-09-08 ok
trk.hello.pascuccicoffee.com 6 2026-07-09 2026-09-06 ok
pages.pascuccicoffee.com 5 2026-07-16 2026-09-13 ok
support.pascuccicoffee.com 5 2026-05-04 2026-09-01 ok
www.pascuccicoffee.com 15 2026-04-29 2026-09-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pascuccicoffee.com (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/pascuccicoffee.com.