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| CIDR range | Maintainer | Description | Source |
|---|---|---|---|
| 76.72.240.0/20 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 164.42.0.0/16 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 204.15.144.0/21 | LEVEL3-MNT | Proxy-registered route object | LEVEL3 |
| 206.61.224.0/21 | LEVEL3-MNT | Proxy-registered route object | LEVEL3 |
| 208.81.168.0/21 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 208.81.168.0/24 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 208.81.171.0/24 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 208.81.174.0/24 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |
| 2604:f180::/32 | MAINT-AS23520 | COLUMBUS NETWORKS TRANSIT CUSTOMERS | RADB |