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.

55 hosts · 279 ms

HostCertsFirst seenLast seen
sectionai.com 25 2026-04-07 2026-09-26
*.sectionai.com 3 2025-12-10 2026-09-07
cb.sectionai.com 6 2026-06-15 2026-08-13
hub.sectionai.com 2 2026-09-02 2026-09-02
apac.sectionai.com 10 2026-04-22 2026-08-20
clerk-apac.sectionai.com 4 2026-04-22 2026-04-22
clerk.apac.sectionai.com 6 2026-04-22 2026-04-22
roadmap-pdf.sectionai.com 2 2026-06-26 2026-06-26
g.sectionai.com 8 2026-05-02 2026-08-29
marketing.sectionai.com 1 2025-11-14 2025-11-14
command-api.sectionai.com 10 2026-05-11 2026-09-07
clerk.command-api.sectionai.com 2 2026-04-15 2026-04-15
foundation-api.sectionai.com 10 2026-05-11 2026-09-06
demo-api.sectionai.com 2 2026-10-05 2026-10-05
roadmap-api.sectionai.com 6 2026-06-26 2026-08-24
demo-hq-api.sectionai.com 4 2026-10-02 2026-10-02
tenancy-api.sectionai.com 6 2026-06-26 2026-08-25
directory-api.sectionai.com 2 2026-08-12 2026-08-12
link.sectionai.com 11 2026-05-18 2026-09-14
clerk.sectionai.com 20 2026-04-14 2026-08-30
cowork.sectionai.com 7 2026-04-25 2026-08-21
l.sectionai.com 9 2026-05-22 2026-09-18
dataroom.sectionai.com 11 2026-05-18 2026-09-13
clerk.dataroom.sectionai.com 8 2026-04-26 2026-08-22
accounts.dataroom.sectionai.com 8 2026-04-26 2026-08-23
demo.sectionai.com 3 2025-12-10 2026-10-05
clerk.demo.sectionai.com 2 2026-10-05 2026-10-05
accounts.demo.sectionai.com 4 2026-10-05 2026-10-05
dayforce-hr-workflow-map.sectionai.com 1 2026-09-02 2026-09-02
roadmap.sectionai.com 4 2026-06-26 2026-08-24
ferguson-ai-transformation-roadmap.sectionai.com 3 2026-08-04 2026-10-03
mcp.sectionai.com 12 2026-05-11 2026-09-07
clerk.rfp.sectionai.com 2 2026-05-25 2026-05-25
accounts.rfp.sectionai.com 4 2026-05-26 2026-05-26
help.sectionai.com 11 2026-04-28 2026-09-27
app.sectionai.com 6 2026-04-17 2026-08-13
staging.app.sectionai.com 9 2026-05-22 2026-09-18
hq.sectionai.com 10 2026-05-11 2026-09-07
demo-hq.sectionai.com 3 2026-10-02 2026-10-02
clerk.demo-hq.sectionai.com 3 2026-10-01 2026-10-01
accounts.demo-hq.sectionai.com 3 2026-10-01 2026-10-01
staging.hq.sectionai.com 2 2026-09-23 2026-09-23
clerk.hq.sectionai.com 2 2026-04-15 2026-04-15
calendar.sectionai.com 5 2026-04-27 2026-08-29
docs.sectionai.com 8 2026-05-09 2026-09-05
casestudies.sectionai.com 2 2026-10-06 2026-10-06
marketing-tools.sectionai.com 4 2026-06-15 2026-08-13
clerk.agents.sectionai.com 6 2026-05-30 2026-07-28
clerk.mcp.agents.sectionai.com 6 2026-05-30 2026-05-31
accounts.agents.sectionai.com 8 2026-05-30 2026-07-28
accounts.sectionai.com 10 2026-04-14 2026-08-14
sys.sectionai.com 2 2026-09-21 2026-09-21
t.sectionai.com 12 2026-05-03 2026-08-29
proficiencytest.sectionai.com 10 2026-04-30 2026-08-26
www.sectionai.com 11 2026-06-01 2026-09-27

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