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 · 321 ms

HostCertsFirst seenLast seenDNS
ca.eml.winners.ca 2 2025-07-22 2026-06-25 ok
e.eml.winners.ca 2 2025-07-22 2026-06-25 ok
preferences.eml.winners.ca 14 2026-04-25 2026-08-21 ok
images.eml.winners.ca 2 2025-07-23 2026-06-25 ok
view.eml.winners.ca 2 2025-07-23 2026-06-25 ok

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