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 · 327 ms

HostCertsFirst seenLast seenDNS
cloud.mail.crateandbarrel.ca 2 2026-04-20 2026-09-21 ok
image.mail.crateandbarrel.ca 4 2026-04-01 2026-09-28 ok
click.mail.crateandbarrel.ca 2 2026-04-20 2026-09-21 ok
pages.mail.crateandbarrel.ca 3 2026-04-20 2026-09-21 ok
view.mail.crateandbarrel.ca 2 2026-04-20 2026-09-21 ok

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