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 · 362 ms

HostCertsFirst seenLast seenDNS
wine.gmo 16 2025-08-12 2026-09-22 ok
*.wine.gmo 14 2026-04-21 2026-09-22 —
shop.wine.gmo 10 2025-08-12 2026-10-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/wine.gmo (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/wine.gmo.