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 · 214 ms

HostCertsFirst seenLast seenDNS
gmo-ux.com 23 2025-07-17 2026-09-19 ok
*.gmo-ux.com 20 2026-05-03 2026-09-19 —
www.gmo-ux.com 3 2025-07-17 2026-07-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gmo-ux.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/gmo-ux.com.