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.

7 hosts · 249 ms

HostCertsFirst seenLast seenDNS
cranbrook.ca 29 2026-04-21 2026-09-24 ok
*.cranbrook.ca 11 2026-04-21 2026-09-16 —
staging.cranbrook.ca 5 2026-05-05 2026-09-22 ok
warp.cranbrook.ca 5 2026-05-04 2026-09-01 ok
docs.cranbrook.ca 5 2026-05-08 2026-09-25 ok
mta-sts.cranbrook.ca 18 2026-04-25 2026-09-07 ok
www.cranbrook.ca 5 2026-05-07 2026-09-24 ok

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