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 · 315 ms

HostCertsFirst seenLast seenDNS
worldcoppersmith.com 20 2026-04-20 2026-09-27 ok
*.worldcoppersmith.com 20 2026-04-20 2026-09-27 —
support.worldcoppersmith.com 4 2026-04-09 2026-08-07 ok

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