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 · 332 ms

HostCertsFirst seenLast seenDNS
klinecollective.com 22 2026-04-14 2026-09-26 ok
*.klinecollective.com 7 2026-04-17 2026-09-06 —
gtm.klinecollective.com 5 2026-04-23 2026-08-21 ok
load.gtm.klinecollective.com 6 2026-04-16 2026-08-12 ok
www.klinecollective.com 13 2026-04-14 2026-09-26 ok

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