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 · 269 ms

HostCertsFirst seenLast seenDNS
balanz.info 7 2026-05-04 2026-09-26 ok
*.balanz.info 7 2026-05-04 2026-09-26 —
mta-sts.balanz.info 5 2026-05-10 2026-09-08 ok

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