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 · 294 ms

HostCertsFirst seenLast seenDNS
image.email.naturalizer.com 4 2025-07-14 2026-08-10 ok
click.email.naturalizer.com 2 2025-09-29 2026-09-20 ok
pages.email.naturalizer.com 2 2025-09-29 2026-09-18 ok
view.email.naturalizer.com 3 2025-09-29 2026-09-16 ok

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