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.

36 hosts · 223 ms

HostCertsFirst seenLast seen
coloradomtn.edu 10 2025-08-08 2026-10-04
*.coloradomtn.edu 2 2025-08-08 2026-08-28
commencement2020.coloradomtn.edu 5 2026-06-01 2026-08-05
live-ec2.coloradomtn.edu 4 2025-07-02 2026-09-27
www.live-ec2.coloradomtn.edu 4 2025-07-02 2026-09-27
rds2.coloradomtn.edu 5 2026-05-01 2026-08-28
stage-t4.coloradomtn.edu 1 2026-06-22 2026-06-22
ctwhub.coloradomtn.edu 3 2026-08-21 2026-08-21
selfservice.coloradomtn.edu 3 2026-06-24 2026-08-23
testselfservice.coloradomtn.edu 3 2026-06-16 2026-08-16
online.coloradomtn.edu 7 2026-06-01 2026-10-04
enews.archive.coloradomtn.edu 4 2026-04-13 2026-08-11
catalog.coloradomtn.edu 2 2025-08-08 2026-08-28
m.catalog.coloradomtn.edu 2 2025-08-08 2026-08-28
wapi.coloradomtn.edu 1 2026-09-04 2026-09-04
coll18fa-ui.coloradomtn.edu 1 2026-09-02 2026-09-02
coll18prod-ui.coloradomtn.edu 1 2026-09-03 2026-09-03
coll18training-ui.coloradomtn.edu 1 2026-09-02 2026-09-02
coll18dev-ui.coloradomtn.edu 1 2026-09-02 2026-09-02
webmail.coloradomtn.edu 5 2026-04-22 2026-08-19
community-education.coloradomtn.edu 9 2026-05-01 2026-10-04
go.coloradomtn.edu 8 2026-04-21 2026-08-17
help.coloradomtn.edu 3 2026-06-29 2026-09-18
basecamp.coloradomtn.edu 1 2026-09-09 2026-09-09
autodiscover.coloradomtn.edu 5 2026-04-22 2026-08-19
bas.coloradomtn.edu 1 2026-08-24 2026-08-24
cmcptstaffjobs.coloradomtn.edu 4 2026-06-09 2026-10-09
coursedogrequests.coloradomtn.edu 3 2026-01-23 2026-09-07
joinus.coloradomtn.edu 1 2025-12-05 2025-12-05
alertus.coloradomtn.edu 6 2026-05-20 2026-09-14
enews.coloradomtn.edu 4 2026-04-14 2026-08-14
connect.coloradomtn.edu 5 2026-04-22 2026-08-18
commencement.coloradomtn.edu 4 2026-04-13 2026-08-11
wapi-dev.coloradomtn.edu 1 2026-09-03 2026-09-03
www.coloradomtn.edu 3 2026-08-05 2026-10-04
library.coloradomtn.edu 7 2026-05-08 2026-09-23

Programmatic access: API GET /v1/hosts/coloradomtn.edu (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/coloradomtn.edu.