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.

6 hosts · 250 ms

HostCertsFirst seenLast seen
cbr.com 9 2026-04-11 2026-09-08
*.cbr.com 19 2026-04-11 2026-09-24
t13.cbr.com 3 2026-06-08 2026-08-04
sli.cbr.com 2 2026-02-25 2026-07-13
click.newsletter.cbr.com 4 2026-08-13 2026-08-13
community.cbr.com 9 2026-04-15 2026-09-12

Programmatic access: API GET /v1/hosts/cbr.com (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/cbr.com.