CSC HOLDINGS, LLC
CSC Holdings Inc.,
GLEIF verified
LEI
3HG2WD2W22M120IUNG49
Registered name
CSC HOLDINGS, LLC
Jurisdiction
Ultimate parent
No parent on file in GLEIF
Cluster stats
| Netblocks | 90 · 34,586 IPv4 addresses |
| Registered in | United Kingdom (44) · KZ (11) · United States (5) · KW (4) · China (4) · Italy (4) |
| All fragments | 396 blocks across 111 clusters |
| Cluster ID | 208810397 |
| Registry | APNIC |
| Owner jurisdiction | US-DE |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | GLEIF legal-entity match |
| Legal identity | LEI 3HG2WD2W22M120IUNG49 |
| Shared handles | clustered on 35 shared RIR contact/maintainer handles |
| Registry names | 7 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works | |
Footprint over time
5 weekly snapshots · JSON
89
0 netblocks since 2026-07-05
2026-07-05
peak 89
2026-07-19
IP Ranges (90)
showing 50 of 90 — see all — ⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 123.127.189.112/28 | CSC | APNIC | ASSIGNED NON-PORTABLE | ● high |
| 180.168.65.16/30 | CSC | APNIC | ASSIGNED NON-PORTABLE | ● high |
| 24.157.0.0/20 | CSC Holdings Inc., | ARIN | ASSIGNMENT | ● low |
| 59.154.52.128/25 | CSC | APNIC | ASSIGNED NON-PORTABLE | ● low |
| 62.172.148.136/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 62.252.201.224/28 | CSC | RIPE | ASSIGNED PA | ● low |
| 64.15.0.0/20 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● low |
| 65.19.96.0/19 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● low |
| 67.59.224.0/19 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● low |
| 80.207.50.120/29 | CSC-SRL | RIPE | ASSIGNED PA | ● low |
| 81.131.249.176/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.131.249.184/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.131.249.192/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.131.249.200/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.131.249.208/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.131.249.216/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.34.128/28 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.96.208/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.119.104/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.119.232/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.119.240/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.120.136/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.123.32/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.126.56/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.127.136/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.182.200/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.184.40/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.184.232/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.138.188.40/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.179.112/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.188.168/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.189.32/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.195.72/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.200.88/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.200.224/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.142.201.112/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.143.10.136/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.143.44.80/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.143.50.112/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.143.101.96/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.150.207.48/28 | CSC | RIPE | ASSIGNED PA | ● low |
| 81.150.213.128/28 | CSC | RIPE | ASSIGNED PA | ● low |
| 83.145.123.112/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 85.125.80.128/29 | CSC-GmbH | RIPE | ASSIGNED PA | ● low |
| 86.188.198.192/26 | CSC | RIPE | ASSIGNED PA | ● low |
| 88.204.128.8/29 | CSC | RIPE | ASSIGNED PA | ● low |
| 88.204.154.124/30 | CSC | RIPE | ASSIGNED PA | ● low |
| 88.204.237.128/30 | CSC | RIPE | ASSIGNED PA | ● low |
| 89.106.234.0/28 | CSC | RIPE | ASSIGNED PA | ● low |
| 89.218.230.192/26 | CSC | RIPE | ASSIGNED PA | ● low |
Possibly related to this organisation
what's this?Same name family
Separately-registered clusters whose names share “CSC” — 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.
- CSC - Tieteen tietotekniikan keskus Oy 48 blocks
- CSC Telecom, UAB 30 blocks
- CSC Administrative Services Limited 17 blocks
- CSC-IAAS-NET 16 blocks
- CSC Computer Sciences Ltd 14 blocks
- CSC/Funet 11 blocks
- CSC Telecom SIA 10 blocks
- CSC-DCNET-INFRA 6 blocks
Network trust
what's this?
RPKI hygiene: B
how networks compare →
84.4%
of checked blocks have valid RPKI ROA coverage
(76 of 90)
Possible discrepancies (5)
These blocks are registered to CSC Holdings Inc., but cryptographically authorized for a different, unrelated network (2 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.
| 2a00:2381:373::/48 /48 | authorized for AS2856 — British Telecommunications Limited |
| 2a00:2381:fe27:200::/56 /56 | authorized for AS2856 — British Telecommunications Limited |
| 2a00:2381:373::/56 /56 | authorized for AS2856 — British Telecommunications Limited |
| 2a00:2381:373:300::/56 /56 | authorized for AS2856 — British Telecommunications Limited |
| 148.76.224.0/19 /19 | authorized for AS6128 — Cablevision Systems Corp. |
NIC Handles
AC2530-AP
AS1764-MNT
AS5089-MNT
AS6730-MNT
AS9150-MNT
BTNET-MNT
CH-UNISOURCE-MNT
CIO1-ARIN
COMPLETEL-MNT
CSCHO
DUMY-RIPE
DUMY-RIPE
+23 more