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.

32 hosts · 234 ms

HostCertsFirst seenLast seen
stu.edu 17 2025-12-09 2026-10-08
*.stu.edu 4 2025-12-09 2026-10-08
careered.stu.edu 5 2026-05-28 2026-10-07
x-careered.stu.edu 5 2026-05-28 2026-10-07
online.stu.edu 29 2026-04-26 2026-09-29
*.online.stu.edu 7 2026-05-19 2026-09-29
b.online.stu.edu 9 2026-04-20 2026-10-08
*.b.online.stu.edu 4 2026-04-20 2026-06-18
cloud.e.online.stu.edu 1 2026-01-17 2026-01-17
image.e.online.stu.edu 4 2026-02-27 2026-09-09
click.e.online.stu.edu 1 2026-01-17 2026-01-17
view.e.online.stu.edu 1 2026-01-17 2026-01-17
mi.online.stu.edu 1 2026-01-26 2026-01-26
track.s.online.stu.edu 9 2026-05-11 2026-09-30
*.track.s.online.stu.edu 9 2026-05-11 2026-09-30
donate.stu.edu 2 2026-03-11 2026-07-27
*.donate.stu.edu 3 2026-05-13 2026-10-08
oitblog.stu.edu 6 2026-04-20 2026-10-01
exploreglobal.stu.edu 2 2026-08-17 2026-08-17
go.exploreglobal.stu.edu 1 2026-08-18 2026-08-18
ps.exploreglobal.stu.edu 2 2026-08-17 2026-08-17
www.exploreglobal.stu.edu 2 2026-08-17 2026-08-17
stuglobal.stu.edu 5 2026-04-14 2026-06-12
applyglobal.stu.edu 5 2026-06-05 2026-09-30
*.nam.stu.edu 3 2026-05-13 2026-10-08
learn.stu.edu 1 2026-06-02 2026-06-02
scholarship.stu.edu 7 2026-05-19 2026-09-17
nursinghelp.stu.edu 5 2026-04-27 2026-08-25
www.stu.edu 10 2026-05-21 2026-09-16
apply.stu.edu 4 2026-06-04 2026-09-30
library.stu.edu 6 2026-06-01 2026-09-14
lawlibrary.stu.edu 6 2026-06-01 2026-09-14

Programmatic access: API GET /v1/hosts/stu.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/stu.edu.