NATIONAL GRID PLC

National Grid
Data as of 2026-10-18
GLEIF verified
Complete entity footprint
2 linked clusters · 13 netblocks · 133,416 IPv4 addresses · 7 IPv6 prefixes
This organisation's clusters combined by evidence — shared GLEIF corporate family — not name similarity, so genuinely different organisations that share a name are excluded.
View the full entity page →
LEI
8R95QZMKZLJX5Q2XR704
Registered name
NATIONAL GRID PLC
Jurisdiction
GB
Ultimate parent
No parent on file in GLEIF
This organisation
Netblocks12 · 133,416 IPv4 addresses
IPv6 6 prefixes (largest 2602:272::/36)
Registered in United States (4) · United Kingdom (2)
Also registered under this name 17 netblocks across 5 separate records
Record ID250344225
RegistryARIN
Owner jurisdictionGB
Customerssee who runs inside this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 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 · report an issue

IP Ranges (12)

⬇ export CSV
CIDR Org name Registry Status Confidence
148.183.0.0/16 National Grid ARIN DIRECT ALLOCATION ● high
159.74.0.0/16 National Grid ARIN DIRECT ALLOCATION ● high
192.146.145.0/24 National Grid ARIN DIRECT ALLOCATION ● high
198.74.8.0/21 National Grid ARIN DIRECT ALLOCATION ● high
2602:272::/36 National Grid ARIN DIRECT ALLOCATION ● high
2620:a5:e000::/48 National Grid ARIN DIRECT ALLOCATION ● high
31.121.73.160/29 NATIONAL-GRID RIPE ASSIGNED PA ● low
195.27.189.64/27 NATIONAL-GRID RIPE ASSIGNED PA ● low
2a00:2381:888::/48 NATIONAL-GRID RIPE AGGREGATED-BY-LIR ● low
2a00:2381:888::/56 NATIONAL-GRID RIPE ASSIGNED ● low
2a00:2381:d653::/48 NATIONAL-GRID RIPE AGGREGATED-BY-LIR ● low
2a00:2381:d653::/56 NATIONAL-GRID RIPE ASSIGNED ● low

IPv6 ranges (6)

CIDR
2602:272::/36
2620:a5:e000::/48
2a00:2381:888::/48
2a00:2381:d653::/48
2a00:2381:888::/56
2a00:2381:d653::/56

Footprint over time

17 weekly snapshots · JSON
12 +2 netblocks since 2026-07-05
2026-07-05 peak 12 2026-10-18

Corporate group (2 confirmed entities)

+2 additional unconfirmed candidates not shown — full list (JSON)

Network trust

what's this?
RPKI hygiene: C how networks compare →
50.0% of checked blocks have valid RPKI ROA coverage (6 of 12)
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