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 · 214 ms

HostCertsFirst seenLast seenDNS
sonic.gmo 2 2025-09-17 2026-06-23 ok
*.sonic.gmo 1 2026-06-23 2026-06-23 —
store.sonic.gmo 4 2026-06-08 2026-09-08 ok
shop.sonic.gmo 6 2026-05-30 2026-10-03 ok
www.sonic.gmo 1 2025-09-17 2025-09-17 ok

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