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 · 203 ms

HostCertsFirst seenLast seen
kidsatelier.com 13 2026-05-16 2026-09-25
track.kidsatelier.com 5 2026-05-23 2026-09-20
mta-sts.kidsatelier.com 2 2026-05-10 2026-05-10
www.kidsatelier.com 15 2026-05-15 2026-09-25

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