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.

3 hosts · 308 ms

HostCertsFirst seenLast seenDNS
mibaby.fr 4 2026-04-17 2026-08-16 ok
nl-tracking.mibaby.fr 5 2026-05-17 2026-09-15 ok
www.mibaby.fr 4 2026-04-17 2026-08-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mibaby.fr (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/mibaby.fr.