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 · 294 ms

HostCertsFirst seenLast seenDNS
tracking.cds-mail.fanza.info 1 2026-07-07 2026-07-07 ok
stg.tracking.cds-mail.fanza.info 1 2026-07-07 2026-07-07 ok
dev.tracking.cds-mail.fanza.info 1 2026-07-02 2026-07-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fanza.info (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/fanza.info.