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 · 297 ms

HostCertsFirst seenLast seenDNS
kvanum.com 3 2026-03-15 2026-08-15 ok
*.kvanum.com 3 2026-03-15 2026-08-15 —
intranet.kvanum.com 1 2026-09-22 2026-09-22 ok
www.intranet.kvanum.com 1 2026-09-22 2026-09-22 ok
flex.kvanum.com 5 2026-04-19 2026-09-22 ok
www.flex.kvanum.com 1 2026-09-22 2026-09-22 ok

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