Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

21 hosts · 352 ms

HostCertsFirst seenLast seenDNS
collegeadvisor.com 10 2025-09-17 2026-08-28 ok
*.collegeadvisor.com 10 2025-06-28 2026-09-12 —
media.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
here.collegeadvisor.com 3 2026-06-10 2026-08-18 ok
api.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
admin.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
go.collegeadvisor.com 6 2026-04-29 2026-08-25 ok
app.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
sms.collegeadvisor.com 14 2026-05-23 2026-09-19 ok
*.partners.collegeadvisor.com 8 2025-07-27 2026-06-28 —
api-uat44.partners.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
api-stag.partners.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
api.partners.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
api-uat.partners.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
advisors.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
cloud.students.collegeadvisor.com 16 2025-08-25 2026-08-25 ok
image.students.collegeadvisor.com 4 2025-08-11 2026-07-20 ok
click.students.collegeadvisor.com 12 2025-08-25 2026-08-25 ok
view.students.collegeadvisor.com 12 2025-08-26 2026-08-25 ok
api-uat.collegeadvisor.com 5 2026-05-12 2026-08-04 ok
www.collegeadvisor.com 16 2026-04-22 2026-08-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/collegeadvisor.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/collegeadvisor.com.