CSC
CSC Holdings Inc.,
Data as of 2026-08-09
GLEIF verified
Complete entity footprint
2 linked clusters ·
213 netblocks ·
5,238,647 IPv4 addresses ·
23 IPv6 prefixes
This organisation's clusters combined by evidence —
shared operating domain cv.net
— not name similarity, so genuinely different organisations that share a name are excluded.
LEI
969500TZOAK84E3BDC75
Registered name
CSC
Jurisdiction
Ultimate parent
No parent on file in GLEIF
Cluster stats
| Netblocks | 91 · 34,672 IPv4 addresses |
| IPv6 | 5 prefixes (largest 2620:0:50a0::/48) |
| Registered in | United Kingdom (44) · KZ (11) · United States (5) · KW (4) · China (4) · Italy (4) |
| All fragments | 397 blocks across 111 clusters |
| Cluster ID | 217894108 |
| Registry | APNIC |
| Owner jurisdiction | FR |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | GLEIF legal-entity match |
| Legal identity | LEI 969500TZOAK84E3BDC75 |
| 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 · report an issue | |
Footprint over time
7 weekly snapshots · JSON
91
+2 netblocks since 2026-07-05
2026-07-05
peak 91
2026-08-09
IP Ranges (91)
showing 50 of 91 — see all — ⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 24.157.0.0/20 | CSC Holdings Inc., | ARIN | ASSIGNMENT | ● high |
| 64.15.0.0/20 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● high |
| 65.19.96.0/19 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● high |
| 67.59.224.0/19 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● high |
| 123.127.189.112/28 | CSC | APNIC | ASSIGNED NON-PORTABLE | ● high |
| 148.76.224.0/19 | CSC Holdings Inc., | ARIN | ALLOCATION | ● high |
| 180.168.65.16/30 | CSC | APNIC | ASSIGNED NON-PORTABLE | ● high |
| 2620:0:50a0::/48 | CSC Holdings Inc., | ARIN | DIRECT ALLOCATION | ● high |
| 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 |
| 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 |
IPv6 ranges (5)
Domains hosted in this network
what's this?Network trust
what's this?
RPKI hygiene: B
how networks compare →
84.6%
of checked blocks have valid RPKI ROA coverage
(77 of 91)
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