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.

100 hosts (first page) · 455 ms

HostCertsFirst seenLast seenDNS
nationalgrid.com 28 2025-09-11 2026-09-30 ok
*.nationalgrid.com 52 2025-08-21 2026-04-24 —
api-prod-uk-01.nationalgrid.com 6 2026-05-19 2026-08-16 ok
api-fof-uk-01.nationalgrid.com 7 2026-05-22 2026-09-17 ok
api-dr-uk-01.nationalgrid.com 11 2026-06-01 2026-09-27 ok
api-uat-uk-01.nationalgrid.com 12 2026-05-23 2026-09-19 ok
api-sit-uk-01.nationalgrid.com 15 2026-05-22 2026-09-17 ok
api-prod-int-uk-01.nationalgrid.com 1 2025-10-16 2025-10-16 nxdomain
api-fof-int-uk-01.nationalgrid.com 2 2025-10-24 2025-11-05 nxdomain
api-uat-int-uk-01.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-sit-int-uk-01.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-dev-int-uk-01.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-dev-uk-01.nationalgrid.com 12 2026-05-21 2026-09-17 ok
mqfa001.nationalgrid.com 2 2026-08-18 2026-08-18 nxdomain
GDN1US-ASHBN-AIMS-SBC01.nationalgrid.com 1 2026-03-06 2026-03-06 —
gdn1uk-milha-uxwe01.nationalgrid.com 1 2026-09-04 2026-09-04 nxdomain
gdn1us-bilrc-uxwe01.nationalgrid.com 2 2026-06-09 2026-06-09 nxdomain
gdn1uk-felhm-uxwe01.nationalgrid.com 2 2026-05-07 2026-05-13 nxdomain
gdn1us-ashbn-uxwe01.nationalgrid.com 2 2026-03-19 2026-09-30 nxdomain
cmgng01.nationalgrid.com 1 2025-11-21 2025-11-21 ok
azuse-matpr01.nationalgrid.com 12 2025-10-14 2026-10-01 nxdomain
api-qa-us01.nationalgrid.com 9 2025-12-10 2026-09-01 ok
www.api-qa-us01.nationalgrid.com 1 2025-12-10 2025-12-10 nxdomain
api-preprod-us01.nationalgrid.com 11 2025-12-10 2026-09-29 ok
www.api-preprod-us01.nationalgrid.com 3 2025-12-10 2026-09-29 nxdomain
api-us01.nationalgrid.com 12 2025-12-10 2026-09-29 ok
www.api-us01.nationalgrid.com 3 2025-12-10 2026-09-29 nxdomain
api-uat-us01.nationalgrid.com 17 2025-12-10 2026-10-05 ok
www.api-uat-us01.nationalgrid.com 3 2025-12-10 2026-09-29 nxdomain
api-dev-us01.nationalgrid.com 1 2026-02-02 2026-02-02 nxdomain
hza-c1.nationalgrid.com 1 2026-03-13 2026-03-13 ok
hza-broker-c1.nationalgrid.com 1 2026-03-13 2026-03-13 nxdomain
hza-e1.nationalgrid.com 1 2026-03-13 2026-03-13 ok
hza-broker-e1.nationalgrid.com 1 2026-03-13 2026-03-13 nxdomain
hza-uks1.nationalgrid.com 1 2026-04-28 2026-04-28 ok
hza-broker-uks1.nationalgrid.com 1 2026-04-28 2026-04-28 nxdomain
hza-ukw1.nationalgrid.com 1 2026-04-28 2026-04-28 ok
hza-broker-ukw1.nationalgrid.com 1 2026-04-28 2026-04-28 nxdomain
api-prod-uk-02.nationalgrid.com 4 2026-05-19 2026-05-19 ok
api-fof-uk-02.nationalgrid.com 5 2026-05-21 2026-06-19 ok
api-dr-uk-02.nationalgrid.com 9 2026-06-01 2026-09-27 ok
api-uat-uk-02.nationalgrid.com 3 2026-05-23 2026-06-19 ok
api-sit-uk-02.nationalgrid.com 3 2026-05-21 2026-06-19 ok
api-prod-int-uk-02.nationalgrid.com 1 2025-10-16 2025-10-16 nxdomain
api-fof-int-uk-02.nationalgrid.com 2 2025-10-24 2025-11-05 nxdomain
api-uat-int-uk-02.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-sit-int-uk-02.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-dev-int-uk-02.nationalgrid.com 2 2025-10-24 2025-11-06 nxdomain
api-dev-uk-02.nationalgrid.com 3 2026-05-22 2026-06-19 ok
azuse-matpr02.nationalgrid.com 12 2025-10-14 2026-10-01 nxdomain
api-qa-us02.nationalgrid.com 12 2026-02-24 2026-08-28 ok
api-preprod-us02.nationalgrid.com 12 2026-02-02 2026-09-16 ok
api-us02.nationalgrid.com 12 2026-02-24 2026-09-17 ok
api-uat-us02.nationalgrid.com 14 2026-02-24 2026-09-16 ok
api-dev-us02.nationalgrid.com 1 2026-02-02 2026-02-02 nxdomain
hza-e2.nationalgrid.com 1 2025-07-28 2025-07-28 ok
slab-cm-api-fof2.nationalgrid.com 12 2026-05-05 2026-09-01 ok
ecm2.nationalgrid.com 1 2026-04-16 2026-04-16 ok
www.ecm2.nationalgrid.com 1 2026-04-16 2026-04-16 nxdomain
matillion2.nationalgrid.com 3 2026-01-29 2026-01-29 nxdomain
cxp-uwp2-prod-eus2.nationalgrid.com 2 2025-11-19 2026-05-14 nxdomain
cxp-uwp2-prf-eus2.nationalgrid.com 2 2025-11-21 2026-05-15 nxdomain
cxp-uwp2-uat-eus2.nationalgrid.com 2 2026-05-14 2026-05-15 nxdomain
chat2.nationalgrid.com 11 2026-05-29 2026-09-25 ok
matillion-dev2.nationalgrid.com 8 2025-08-15 2026-09-03 nxdomain
api-fof-uk-03.nationalgrid.com 1 2026-06-19 2026-06-19 nxdomain
api-uat-uk-03.nationalgrid.com 3 2026-05-23 2026-06-19 ok
api-sit-uk-03.nationalgrid.com 3 2026-05-22 2026-06-19 ok
api-uat-int-uk-03.nationalgrid.com 1 2025-11-06 2025-11-06 nxdomain
api-sit-int-uk-03.nationalgrid.com 1 2025-11-06 2025-11-06 nxdomain
api-dev-int-uk-03.nationalgrid.com 1 2025-11-06 2025-11-06 nxdomain
api-dev-uk-03.nationalgrid.com 13 2026-05-21 2026-09-16 ok
matillion3.nationalgrid.com 2 2026-02-19 2026-02-19 nxdomain
riiot3.nationalgrid.com 8 2026-05-20 2026-09-15 ok
www.riiot3.nationalgrid.com 6 2026-05-21 2026-09-17 ok
SF-ECP-ISP.nationalgrid.com 3 2025-09-03 2026-08-17 —
SF-ECP-ISQ.nationalgrid.com 3 2026-03-04 2026-09-15 —
SF-ECP-IST.nationalgrid.com 1 2025-07-11 2025-07-11 —
cxp-mba.nationalgrid.com 3 2025-11-06 2026-08-20 nxdomain
dev-mba.nationalgrid.com 2 2026-02-26 2026-07-15 ok
fleetadvisoryma.nationalgrid.com 18 2025-11-25 2026-09-20 ok
clcpa.nationalgrid.com 2 2026-05-05 2026-05-05 nodata
etsupporthub-qa.nationalgrid.com 8 2026-05-04 2026-08-30 ok
designspatial-qa.nationalgrid.com 2 2025-10-13 2026-02-24 nxdomain
tescomm-qa.nationalgrid.com 1 2026-02-04 2026-02-04 nxdomain
gis-qa.nationalgrid.com 1 2026-02-04 2026-02-04 ok
connectnowus-qa.nationalgrid.com 10 2026-04-29 2026-08-26 ok
admin.connectnowus-qa.nationalgrid.com 10 2025-09-08 2026-09-14 ok
registration.connectnowus-qa.nationalgrid.com 10 2025-09-08 2026-09-14 ok
ng-mft-qa.nationalgrid.com 1 2026-05-29 2026-05-29 nxdomain
gridnow-qa.nationalgrid.com 12 2026-05-07 2026-09-02 ok
cleanenergy-qa.nationalgrid.com 8 2026-04-20 2026-08-16 ok
cisfoagextwebqa.nationalgrid.com 10 2026-04-19 2026-08-15 ok
apiqa.nationalgrid.com 14 2025-11-26 2026-09-28 ok
dsqa.nationalgrid.com 2 2025-08-19 2026-07-28 ok
dmsqa.nationalgrid.com 2 2025-08-19 2026-07-28 nxdomain
ngetdata.nationalgrid.com 14 2026-05-23 2026-09-19 ok
vkls-acc-beta.nationalgrid.com 1 2026-06-02 2026-06-02 nxdomain
vkls-acc-async-beta.nationalgrid.com 1 2026-06-02 2026-06-02 nxdomain
vkls-async-beta.nationalgrid.com 2 2025-08-08 2026-08-10 nxdomain

Showing the first 100 hostnames — sign in with GitHub or Google to page the full list, or use the API with an API key: GET /v1/hosts/nationalgrid.com.

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/nationalgrid.com.