Charles River Operation
Data as of 2026-07-26
BGP inherited
Cluster stats
| Netblocks | 73 · 24,392 IPv4 addresses |
| IPv6 | 7 prefixes (largest 2607:5840::/32) |
| Registered in | United States (58) · United Kingdom (5) · Germany (2) · SC (1) · Sweden (1) |
| All fragments | 84 blocks across 6 clusters |
| Cluster ID | 213234139 |
| Registry | BGP |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | BGP parent (inherited) |
| Shared handles | clustered on 21 shared RIR contact/maintainer handles |
| Registry names | 9 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works · report an issue | |
Footprint over time
6 weekly snapshots · JSON
74
-8 netblocks since 2026-07-05
2026-07-05
peak 82
2026-07-26
IP Ranges (73)
showing 50 of 73 — see all — ⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 5.182.51.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 5.182.199.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 31.132.54.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.124.1.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.146.55.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.242.7.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.242.12.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.242.18.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 38.242.24.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 44.32.53.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 44.104.110.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 45.10.23.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 45.58.211.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 45.67.142.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 45.67.143.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 45.67.144.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 52.124.20.0/23 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 63.246.128.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 63.246.156.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 63.246.157.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 63.251.142.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 66.150.192.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 66.150.196.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 66.150.198.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 67.22.61.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 67.22.62.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 74.118.68.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 74.118.69.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 74.118.70.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 74.118.71.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 79.98.181.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 79.98.182.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 80.239.139.244/30 | Charles River Labs | RIPE | ASSIGNED PA | ● high |
| 83.143.107.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 92.249.28.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 94.154.168.0/23 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 94.154.176.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 94.154.179.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 144.86.187.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 147.189.137.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.3.45.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.3.129.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.3.222.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.3.236.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.3.237.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.9.0.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.9.154.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.12.2.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.12.6.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.13.0.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
IPv6 ranges (7)
Network trust
what's this?
RPKI hygiene: D
how networks compare →
48.6%
of checked blocks have valid RPKI ROA coverage
(36 of 74)
Possible discrepancies (2)
These blocks are registered to Charles River Operation 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:f4eb::/48 /48 | authorized for AS2856 — British Telecommunications Limited |
| 2a00:2381:f4eb::/56 /56 | authorized for AS2856 — British Telecommunications Limited |
NIC Handles
ALAXONA
AS40834
AS64249
AS8426-MNT
BTNET-MNT
COPSO-ARIN
COPSO-ARIN
COPSO-ARIN
COPSO-ARIN
DUMY-RIPE
DUMY-RIPE
JC-328
+9 more