Charles River Operation
Data as of 2026-09-27
BGP inherited
This organisation
| Netblocks | 74 · 24,648 IPv4 addresses |
| IPv6 | 7 prefixes (largest 2607:5840::/32) |
| Registered in | United States (60) · United Kingdom (5) · Germany (2) · SC (1) · Sweden (1) |
| Also registered under this name | 86 netblocks across 6 separate records |
| Record ID | 245504570 |
| Registry | BGP |
| Customers | see who runs inside this network → |
Evidence & provenance ?
| Attribution | BGP parent (inherited) |
| Shared handles | clustered on 29 shared RIR contact/maintainer handles |
| Registry names | 11 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works · report an issue | |
IP Ranges (74)
⬇ 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 | ARIN | ALLOCATION | ● high |
| 154.39.0.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 154.39.2.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 192.65.136.0/24 | Charles River Data Systems | ARIN | DIRECT ALLOCATION | ● high |
| 192.203.175.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 193.148.94.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 198.145.141.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 198.145.142.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 198.145.143.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 206.197.231.0/24 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 207.32.128.0/19 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 208.89.252.0/22 | Charles River Laboratories, Inc. | BGP | ANNOUNCED | ● high |
| 2001:4830:c210::/48 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 2001:4830:c900::/40 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 2602:fe6d::/36 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 2606:6680:13::/48 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 2607:5840::/32 | Charles River Operation | BGP | ANNOUNCED | ● high |
| 80.168.2.64/28 | CHARLES-RIVER-DEVELOPMENT | RIPE | ASSIGNED PA | ● low |
| 80.168.4.112/28 | CHARLES-RIVER-DEVELOPMENT | RIPE | ASSIGNED PA | ● low |
| 185.212.53.176/29 | CHARLES-RIVER-NET | RIPE | ASSIGNED PA | ● low |
| 194.72.157.224/28 | CHARLES-RIVER-ASSOCIATES | RIPE | ASSIGNED PA | ● low |
| 195.11.179.132/30 | CHARLES-RIVER-LABORATORIES-LTD | RIPE | ASSIGNED PA | ● low |
| 213.137.180.248/29 | charles_river_laboratories | RIPE | ASSIGNED PA | ● low |
| 2a00:2381:f4eb::/56 | CHARLES-RIVER-ASSOCIATES | RIPE | ASSIGNED | ● low |
| 2a00:2381:f4eb::/48 | CHARLES-RIVER-ASSOCIATES | RIPE | AGGREGATED-BY-LIR | ● low |
IPv6 ranges (7)
Footprint over time
14 weekly snapshots · JSON
76
-6 netblocks since 2026-07-05
2026-07-05
peak 82
2026-09-27
Network trust
what's this?
RPKI hygiene: D
how networks compare →
47.4%
of checked blocks have valid RPKI ROA coverage
(36 of 76)
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
CRDS-1
CRL-48
CRL-NOC-ARIN
+17 more