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 · 252 ms

HostCertsFirst seenLast seenDNS
mableton.gov 17 2025-11-24 2026-09-20 ok
*.mableton.gov 8 2026-05-13 2026-09-08 —
www.mableton.gov 12 2025-11-24 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mableton.gov (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/mableton.gov.