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.

69 hosts · 462 ms

HostCertsFirst seenLast seenDNS
nationalgrid.co.uk 10 2026-04-25 2026-08-21 ok
dataportal2.nationalgrid.co.uk 8 2026-04-20 2026-08-16 ok
m365a.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
connecteddata.nationalgrid.co.uk 15 2026-04-20 2026-09-23 ok
planningdata.nationalgrid.co.uk 10 2026-04-27 2026-08-23 ok
m365b.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
winterhub.nationalgrid.co.uk 4 2026-10-02 2026-10-02 ok
careershub.nationalgrid.co.uk 11 2026-05-16 2026-09-11 ok
engagementhub.nationalgrid.co.uk 12 2026-04-25 2026-08-22 ok
m365c.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
m365d.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
planned.nationalgrid.co.uk 8 2026-04-20 2026-08-16 ok
hybrid.nationalgrid.co.uk 4 2026-09-10 2026-09-18 ok
mygrid.nationalgrid.co.uk 3 2026-09-11 2026-09-29 nodata
esomwd.nationalgrid.co.uk 12 2026-05-01 2026-08-27 ok
autodiscover.datascience.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
pensionsbridge.nationalgrid.co.uk 8 2026-04-16 2026-08-12 ok
powerdiscoveryzone.nationalgrid.co.uk 12 2026-04-20 2026-08-17 ok
yourpowerfuture.nationalgrid.co.uk 10 2026-04-19 2026-08-15 ok
link.nationalgrid.co.uk 6 2026-06-02 2026-09-30 ok
vendorrisk.nationalgrid.co.uk 2 2025-09-03 2026-08-04 ok
commercial.nationalgrid.co.uk 11 2026-05-23 2026-09-18 ok
pensionsportal.nationalgrid.co.uk 12 2026-04-12 2026-10-07 ok
gbcmn.nationalgrid.co.uk 24 2026-05-24 2026-07-24 nodata
monitoring01.gbcmn.nationalgrid.co.uk 3 2026-04-12 2026-06-12 nodata
admin.gbcmn.nationalgrid.co.uk 5 2026-05-06 2026-09-03 nodata
www.gbcmn.nationalgrid.co.uk 24 2026-05-24 2026-07-24 nodata
generation.nationalgrid.co.uk 10 2026-04-21 2026-08-18 ok
fieldinfo.nationalgrid.co.uk 8 2026-04-21 2026-08-17 ok
dso.nationalgrid.co.uk 12 2026-05-05 2026-09-01 ok
ewmspp.nationalgrid.co.uk 10 2026-05-07 2026-09-03 ok
customerengagementgroup.nationalgrid.co.uk 10 2026-04-19 2026-08-16 ok
vmsxp.nationalgrid.co.uk 12 2026-05-04 2026-08-30 ok
cbtxp.nationalgrid.co.uk 8 2026-05-02 2026-08-29 ok
carbontracer.nationalgrid.co.uk 8 2026-04-19 2026-08-15 ok
supplier.nationalgrid.co.uk 10 2026-04-20 2026-08-16 ok
customer.nationalgrid.co.uk 11 2026-05-24 2026-09-20 ok
autodiscover.nationalgrid.co.uk 4 2026-09-11 2026-09-18 nxdomain
airpower.nationalgrid.co.uk 6 2026-04-11 2026-04-11 ok
trades.nationalgrid.co.uk 4 2026-06-06 2026-10-05 ok
telecoms.nationalgrid.co.uk 8 2026-04-19 2026-08-15 ok
ewms.nationalgrid.co.uk 6 2026-05-05 2026-08-31 ok
connections.nationalgrid.co.uk 8 2026-04-20 2026-08-16 ok
subscriptions.nationalgrid.co.uk 10 2026-05-09 2026-09-05 ok
safetyvideos.nationalgrid.co.uk 8 2026-05-27 2026-09-22 ok
autodiscover.pensionspayslips.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
subscribers.nationalgrid.co.uk 12 2026-04-10 2026-10-05 ok
careers.nationalgrid.co.uk 12 2026-04-19 2026-08-15 ok
autodiscover.careers.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
lvnetworkinsights.nationalgrid.co.uk 8 2026-05-14 2026-09-10 ok
payments.nationalgrid.co.uk 10 2026-04-21 2026-08-18 ok
powercuts.nationalgrid.co.uk 10 2026-04-20 2026-08-16 ok
ews.nationalgrid.co.uk 9 2026-09-11 2026-09-20 nxdomain
mygrid-uat.nationalgrid.co.uk 4 2026-09-23 2026-09-29 nodata
powerconnect-uat.nationalgrid.co.uk 11 2026-04-16 2026-09-16 ok
curtailment-uat.nationalgrid.co.uk 10 2026-03-18 2026-08-18 ok
contact.nationalgrid.co.uk 15 2026-06-02 2026-09-29 ok
autodiscover.contact.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
powerconnect.nationalgrid.co.uk 13 2026-04-16 2026-09-16 ok
curtailment.nationalgrid.co.uk 16 2026-03-18 2026-10-06 ok
wintersupport.nationalgrid.co.uk 9 2026-05-27 2026-09-23 ok
autodiscover.mail-test.nationalgrid.co.uk 2 2026-09-11 2026-09-18 nxdomain
vmsxu.nationalgrid.co.uk 6 2026-05-03 2026-08-29 ok
cbtxu.nationalgrid.co.uk 10 2026-04-21 2026-08-17 ok
esomwddev.nationalgrid.co.uk 10 2026-05-01 2026-08-28 ok
subscriptionsdev.nationalgrid.co.uk 10 2026-05-09 2026-09-05 ok
myview.nationalgrid.co.uk 12 2026-04-18 2026-08-14 ok
www.nationalgrid.co.uk 11 2026-05-31 2026-09-26 ok
marketgateway.nationalgrid.co.uk 11 2026-05-21 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/nationalgrid.co.uk (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/nationalgrid.co.uk.