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.

31 hosts · 246 ms

HostCertsFirst seenLast seen
nctm.org 32 2025-10-20 2026-09-30
*.nctm.org 32 2025-10-20 2026-10-03
r710.nctm.org 4 2026-05-03 2026-07-05
ds1.nctm.org 5 2026-05-25 2026-09-20
rs1.nctm.org 4 2026-04-16 2026-08-13
ds2.nctm.org 5 2026-05-25 2026-09-20
dev2.nctm.org 6 2026-04-20 2026-09-18
ds3.nctm.org 3 2026-06-11 2026-09-26
soa.nctm.org 5 2026-05-04 2026-09-02
aptifyweb.nctm.org 6 2026-04-14 2026-09-11
learninghub.nctm.org 1 2026-02-04 2026-02-04
bod.nctm.org 3 2026-05-29 2026-09-16
board.nctm.org 5 2026-04-20 2026-09-28
drive.nctm.org 4 2026-04-16 2026-08-13
api.nctm.org 5 2026-04-30 2026-08-29
um.nctm.org 2 2026-04-22 2026-04-22
sso.nctm.org 9 2026-04-23 2026-09-19
files.nctm.org 4 2026-04-16 2026-08-13
lms.nctm.org 4 2026-04-16 2026-08-13
members.nctm.org 5 2026-05-07 2026-09-05
stats.nctm.org 1 2026-04-21 2026-04-21
mta-sts.nctm.org 2 2026-04-30 2026-04-30
status.nctm.org 5 2026-05-14 2026-09-10
fthr-content.nctm.org 5 2026-05-27 2026-09-24
support.nctm.org 8 2026-04-17 2026-08-16
dev.nctm.org 7 2026-04-20 2026-09-16
apidev.nctm.org 6 2026-04-21 2026-09-17
ssodev.nctm.org 3 2026-07-10 2026-09-09
www.nctm.org 5 2026-05-02 2026-08-29
xpbx.nctm.org 6 2026-04-20 2026-09-18
my.nctm.org 5 2026-05-01 2026-08-29

Programmatic access: API GET /v1/hosts/nctm.org (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/nctm.org.