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.

4 hosts · 252 ms

HostCertsFirst seenLast seenDNS
hibob.io 1 2025-07-27 2025-07-27 ok
hello.hibob.io 5 2026-05-23 2026-08-10 ok
status.hibob.io 5 2026-05-31 2026-09-27 ok
statusnew.hibob.io 5 2026-06-01 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hibob.io (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/hibob.io.