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 · 322 ms

HostCertsFirst seenLast seenDNS
clearscore.ca 25 2026-04-23 2026-10-01 ok
*.clearscore.ca 25 2026-04-23 2026-10-01 —
email.clearscore.ca 3 2026-05-28 2026-08-12 ok
help.clearscore.ca 5 2026-05-27 2026-09-24 ok
links.clearscore.ca 6 2026-04-13 2026-06-11 ok

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