NATIONAL GRID PLC

National Grid

GLEIF verified

LEI

8R95QZMKZLJX5Q2XR704

Registered name

NATIONAL GRID PLC

Jurisdiction

Ultimate parent

No parent on file in GLEIF

Cluster stats

Netblocks	9 · 133,155 IPv4 addresses
Registered in	United States (3) · United Kingdom (2)
All fragments	14 blocks across 5 clusters
Cluster ID	208812964
Registry	ARIN
Owner jurisdiction	GB
Customers	find customers using this network →

Evidence & provenance ?

Attribution	GLEIF legal-entity match
Legal identity	LEI 8R95QZMKZLJX5Q2XR704
Shared handles	clustered on 12 shared RIR contact/maintainer handles
Registry names	2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

Footprint over time

5 weekly snapshots · JSON

10 0 netblocks since 2026-07-05

2026-07-05 peak 10 2026-07-19

IP Ranges (9)

⬇ export CSV

CIDR	Org name	Registry	Status	Confidence
31.121.73.160/29	NATIONAL-GRID	RIPE	ASSIGNED PA	● low
148.183.0.0/16	National Grid	ARIN	DIRECT ALLOCATION	● low
159.74.0.0/16	National Grid	ARIN	DIRECT ALLOCATION	● low
195.27.189.64/27	NATIONAL-GRID	RIPE	ASSIGNED PA	● low
198.74.8.0/21	National Grid	ARIN	DIRECT ALLOCATION	● low
2a00:2381:888::/48	NATIONAL-GRID	RIPE	AGGREGATED-BY-LIR	● low
2a00:2381:888::/56	NATIONAL-GRID	RIPE	ASSIGNED	● low
2a00:2381:d653::/56	NATIONAL-GRID	RIPE	ASSIGNED	● low
2a00:2381:d653::/48	NATIONAL-GRID	RIPE	AGGREGATED-BY-LIR	● low

Possibly related to this organisation

what's this?

Same name family

Separately-registered clusters whose names share “National Grid” — often per-country or per-system registrations of the same brand, occasionally a different organisation sharing the name. Not counted in this organisation's own footprint.

Sub-allocations under carriers

IP blocks an ISP reassigned to a similarly-named customer — decoded from the ISP's own naming convention, not a direct registration.

NATIONAL-GRID-WIRELESS via Virgin Media Limited sub-allocation
NEXENT_CUSTA360_NATIONALGRID via Pulsant (Scotland) Ltd sub-allocation
NATIONALGRID via Vodafone Group PLC sub-allocation
National Grid Co Globelynx via COLT Technology Services Group Limited sub-allocation
State Grid International Development Belgium Ltd via COLT Technology Services Group Limited sub-allocation

Network trust

what's this?

RPKI hygiene: C how networks compare →

66.7% of checked blocks have valid RPKI ROA coverage (6 of 9)

Possible discrepancies (4)

These blocks are registered to National Grid but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a00:2381:888::/48 /48	authorized for AS2856 — British Telecommunications Limited
2a00:2381:d653::/48 /48	authorized for AS2856 — British Telecommunications Limited
2a00:2381:888::/56 /56	authorized for AS2856 — British Telecommunications Limited
2a00:2381:d653::/56 /56	authorized for AS2856 — British Telecommunications Limited

NIC Handles

BTNET-MNT CHAMP121-ARIN DP1276-ARIN DP1276-ARIN DP1276-ARIN DUMY-RIPE DUMY-RIPE NGUS NGUS-Z VODAFONE-WORLDWIDE-MNTNER WILHE66-ARIN WILHE66-ARIN