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 · 257 ms

HostCertsFirst seenLast seenDNS
gmogshd.com 1 2025-10-22 2025-10-22 ok
*.gmogshd.com 1 2025-10-22 2025-10-22 —
tech.gmogshd.com 2 2025-10-06 2026-07-31 ok
group-it.gmogshd.com 2 2026-05-14 2026-05-14 nxdomain
onepreview.gmogshd.com 3 2026-05-02 2026-08-22 ok

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