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.

2 hosts · 304 ms

HostCertsFirst seenLast seenDNS
panta-rhei.us 2 2026-03-11 2026-07-27 ok
*.panta-rhei.us 2 2026-03-11 2026-07-27 —

Programmatic access, with DNS A records: API GET /v1/hosts/panta-rhei.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/panta-rhei.us.