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.

6 hosts · 294 ms

HostCertsFirst seenLast seenDNS
kineticlabs.com 21 2026-05-01 2026-09-15 ok
*.kineticlabs.com 21 2026-05-01 2026-09-15 —
auth.kineticlabs.com 14 2026-04-09 2026-10-05 ok
custom.kineticlabs.com 5 2026-05-02 2026-08-25 ok
www.custom.kineticlabs.com 5 2026-05-02 2026-08-25 ok
login.kineticlabs.com 5 2026-05-13 2026-09-04 ok

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