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 · 359 ms

HostCertsFirst seenLast seenDNS
ca.eml.marshalls.ca 1 2026-05-27 2026-05-27 ok
e.eml.marshalls.ca 1 2026-05-27 2026-05-27 ok
preferences.eml.marshalls.ca 8 2026-04-14 2026-08-11 ok
images.eml.marshalls.ca 1 2026-05-27 2026-05-27 ok
view.eml.marshalls.ca 1 2026-05-27 2026-05-27 ok

Programmatic access, with DNS A records: API GET /v1/hosts/eml.marshalls.ca (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/eml.marshalls.ca.