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 · 216 ms

HostCertsFirst seenLast seenDNS
gexaemail.com 7 2025-08-02 2026-08-21 ok
*.gexaemail.com 5 2025-08-02 2026-08-21 —
mail.gexaemail.com 4 2025-08-02 2026-08-03 ok
www.mail.gexaemail.com 4 2025-08-02 2026-08-03 nxdomain

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