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.

78 hosts · 481 ms

HostCertsFirst seenLast seenDNS
nisource.com 3 2026-03-18 2026-09-25 ok
CMN1.nisource.com 1 2025-10-27 2025-10-27 —
prodapi1.nisource.com 1 2025-10-08 2025-10-08 nxdomain
stageapi1.nisource.com 1 2025-10-08 2025-10-08 nxdomain
drapi1.nisource.com 1 2025-10-03 2025-10-03 nxdomain
testapi1.nisource.com 1 2025-10-08 2025-10-08 nxdomain
devapi1.nisource.com 1 2025-10-08 2025-10-08 nxdomain
CMN2.nisource.com 1 2025-10-27 2025-10-27 —
mobilemapsqa2.nisource.com 1 2025-12-15 2025-12-15 ok
eftp2.nisource.com 2 2025-07-02 2026-07-28 ok
dev.eftp2.nisource.com 1 2026-04-08 2026-04-08 ok
www.dev.eftp2.nisource.com 1 2026-04-08 2026-04-08 nxdomain
www.eftp2.nisource.com 2 2025-07-02 2026-07-28 nxdomain
tosca.nisource.com 2 2026-02-23 2026-02-23 ok
www.tosca.nisource.com 2 2026-02-23 2026-02-23 nxdomain
vpnmdmcna.nisource.com 2 2025-07-10 2026-07-24 ok
gisazureqa.nisource.com 2 2025-06-10 2026-07-07 ok
wamqa.nisource.com 2 2025-10-10 2025-10-10 nxdomain
mobilemapsqa.nisource.com 1 2025-12-15 2025-12-15 ok
gistestdata.nisource.com 1 2025-06-10 2025-06-10 ok
www.gistestdata.nisource.com 1 2025-06-10 2025-06-10 nxdomain
awac.nisource.com 1 2026-07-31 2026-07-31 nxdomain
gisazurenonprod.nisource.com 2 2025-06-10 2026-07-07 ok
mobilemapsnonprod.nisource.com 1 2025-12-15 2025-12-15 nxdomain
password.nisource.com 1 2025-12-22 2025-12-22 nxdomain
mypassword.nisource.com 1 2025-12-22 2025-12-22 ok
www.mypassword.nisource.com 1 2025-12-22 2025-12-22 nxdomain
workspace.nisource.com 1 2025-09-26 2025-09-26 ok
www.workspace.nisource.com 1 2025-09-26 2025-09-26 nxdomain
awac-stage.nisource.com 1 2026-07-31 2026-07-31 nxdomain
customerapis-stage.nisource.com 1 2026-06-30 2026-06-30 ok
gisazurestage.nisource.com 2 2025-06-10 2026-07-07 ok
ssostage.nisource.com 4 2026-03-13 2026-09-24 ok
www.ssostage.nisource.com 4 2026-03-13 2026-09-24 nxdomain
cdrstage.nisource.com 2 2026-03-31 2026-08-26 ok
gisazure.nisource.com 2 2025-06-10 2026-07-07 ok
iunite.nisource.com 1 2025-11-12 2025-11-12 ok
api.nisource.com 3 2026-03-16 2026-09-24 ok
stageapi.nisource.com 3 2026-03-11 2026-09-18 ok
testapi.nisource.com 1 2025-11-21 2025-11-21 ok
devapi.nisource.com 3 2026-03-09 2026-09-18 ok
vpnmdmham.nisource.com 2 2025-07-10 2026-07-24 ok
srm.nisource.com 1 2026-06-24 2026-06-24 nxdomain
gisazuretrain.nisource.com 2 2025-06-10 2026-07-07 ok
cloud.notification.nisource.com 1 2026-09-30 2026-09-30 ok
image.notification.nisource.com 9 2026-08-27 2026-09-29 ok
click.notification.nisource.com 2 2026-08-27 2026-08-27 ok
view.notification.nisource.com 2 2026-08-26 2026-08-26 ok
gpvpn.nisource.com 2 2025-07-01 2026-07-21 ok
sso.nisource.com 3 2026-04-02 2026-09-24 ok
www.sso.nisource.com 3 2026-04-02 2026-09-24 nxdomain
cnasupgp.nisource.com 2 2026-03-12 2026-10-01 ok
hamsupgp.nisource.com 3 2026-03-12 2026-10-01 ok
filetransfer.nisource.com 3 2026-03-06 2026-09-16 ok
www.filetransfer.nisource.com 3 2026-03-06 2026-09-16 nxdomain
qr.nisource.com 2 2025-08-21 2026-09-10 ok
cis.nisource.com 1 2026-04-07 2026-04-07 ok
test.cis.nisource.com 1 2025-11-21 2025-11-21 ok
www.test.cis.nisource.com 1 2025-11-21 2025-11-21 nxdomain
www.cis.nisource.com 1 2026-04-07 2026-04-07 ok
customerapis.nisource.com 1 2026-07-07 2026-07-07 nxdomain
mobilemaps.nisource.com 1 2025-12-15 2025-12-15 ok
careers.nisource.com 1 2025-12-30 2025-12-30 ok
investors.nisource.com 16 2026-05-28 2026-09-24 ok
jaws.nisource.com 1 2026-05-06 2026-05-06 ok
support.nisource.com 3 2025-09-10 2026-09-29 ok
awac-test.nisource.com 1 2026-07-31 2026-07-31 nxdomain
customerapis-test.nisource.com 1 2026-06-30 2026-06-30 ok
toscatest.nisource.com 2 2026-03-06 2026-09-21 ok
www.toscatest.nisource.com 2 2026-03-06 2026-09-21 nxdomain
niguest.nisource.com 1 2025-12-03 2025-12-03 ok
awac-dev.nisource.com 1 2026-07-31 2026-07-31 ok
customerapis-dev.nisource.com 1 2026-05-20 2026-05-20 ok
gisazuredev.nisource.com 2 2025-06-10 2026-07-07 ok
ssodev.nisource.com 4 2026-04-01 2026-09-24 ok
www.ssodev.nisource.com 4 2026-04-01 2026-09-24 nxdomain
mobilemapsdev.nisource.com 1 2025-12-15 2025-12-15 ok
www.nisource.com 3 2026-03-18 2026-09-25 ok

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