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.

9 hosts · 305 ms

HostCertsFirst seenLast seen
yardbarker.com 2 2026-01-15 2026-01-15
stage.yardbarker.com 2 2026-01-15 2026-01-15
release.yardbarker.com 3 2025-10-21 2026-09-22
sli.yardbarker.com 2 2026-03-06 2026-07-22
*.api.yardbarker.com 1 2026-05-29 2026-05-29
stage-docker.yardbarker.com 3 2025-11-28 2026-07-22
release-docker.yardbarker.com 2 2026-05-29 2026-06-03
preview.yardbarker.com 2 2026-06-29 2026-06-29
www.yardbarker.com 2 2026-01-15 2026-01-15

Programmatic access: API GET /v1/hosts/yardbarker.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/yardbarker.com.