Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 297 ms

HostCertsFirst seenLast seen
cloud.e.rexall.ca 1 2026-02-21 2026-02-21
image.e.rexall.ca 3 2026-02-12 2026-09-02
click.e.rexall.ca 1 2026-02-21 2026-02-21
view.e.rexall.ca 1 2026-02-21 2026-02-21

Programmatic access: API GET /v1/hosts/e.rexall.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/e.rexall.ca.