Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 257 ms

Download CSV
HostCertsFirst seenLast seen
directfax.net 17 2026-05-14 2026-10-06
*.directfax.net 17 2026-05-14 2026-10-06
ems.directfax.net 2 2025-12-30 2026-02-21
dev-ems.directfax.net 1 2026-01-26 2026-01-26

Programmatic access: API GET /v1/hosts/directfax.net (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/directfax.net.