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 · 348 ms

HostCertsFirst seenLast seenDNS
uscargocontrol.com 17 2026-03-16 2026-10-01 ok
tracking.uscargocontrol.com 14 2026-05-25 2026-09-20 ok
trk.uscargocontrol.com 8 2026-04-15 2026-08-11 ok
account.uscargocontrol.com 7 2026-04-20 2026-08-29 ok
www.uscargocontrol.com 12 2026-05-20 2026-09-28 ok

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