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.

18 hosts · 247 ms

Download CSV
HostCertsFirst seenLast seen
segmentstream.com 22 2026-06-08 2026-10-09
*.segmentstream.com 17 2026-06-08 2026-10-04
cloud.segmentstream.com 3 2026-08-04 2026-10-05
dtc-guide.segmentstream.com 4 2026-06-09 2026-10-10
b2b-saas-guide.segmentstream.com 5 2026-04-28 2026-08-28
course.segmentstream.com 5 2026-05-14 2026-09-17
auth.segmentstream.com 6 2026-08-10 2026-10-08
demo.segmentstream.com 5 2026-04-27 2026-08-29
partner.segmentstream.com 2 2026-05-06 2026-05-06
analytics.segmentstream.com 4 2026-05-01 2026-10-09
www.analytics.segmentstream.com 3 2026-05-04 2026-08-22
docs.segmentstream.com 5 2026-06-02 2026-10-06
tools.segmentstream.com 2 2026-05-13 2026-05-13
dev-tools.segmentstream.com 3 2026-05-26 2026-09-12
git.segmentstream.com 2 2026-10-09 2026-10-09
*.git.segmentstream.com 2 2026-10-09 2026-10-09
www.segmentstream.com 3 2026-06-15 2026-08-15
continuity.segmentstream.com 1 2026-09-18 2026-09-18

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