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.

4 hosts · 371 ms

HostCertsFirst seenLast seenDNS
gmo-st.com 2 2025-06-18 2026-06-21 ok
*.gmo-st.com 2 2025-06-18 2026-06-21 —
w1.gmo-st.com 1 2026-09-08 2026-09-08 ok
x.w1.gmo-st.com 1 2026-09-08 2026-09-08 ok

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