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.

5 hosts · 264 ms

HostCertsFirst seenLast seenDNS
cmtickets.com 20 2026-04-17 2026-10-04 ok
*.cmtickets.com 8 2026-04-17 2026-10-04 —
nac.cmtickets.com 5 2026-05-09 2026-09-06 ok
shop.cmtickets.com 5 2026-05-09 2026-09-06 ok
www.cmtickets.com 12 2026-04-23 2026-09-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/cmtickets.com (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/cmtickets.com.