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| CIDR range | Maintainer | Description | Source |
|---|---|---|---|
| 24.52.50.0/23 | MAINT-PHONOSCOPE | SMART-CITY-PREFIX-3 | NTTCOM |
| 24.56.128.0/24 | MNT-SCNC-1 | Smart City Networks | ARIN |
| 24.56.128.0/24 | MAINT-PSLIGHTWAVE | SmartCity-GRB-Net-5 | NTTCOM |
| 24.75.224.0/22 | MNT-SCNC-1 | Smart City Networks | ARIN |
| 24.75.224.0/22 | MAINT-PHONOSCOPE | SmartCity-GRB-Net-4 | NTTCOM |
| 65.90.100.0/22 | LEVEL3-MNT | Proxy-registered route object | LEVEL3 |
| 65.90.100.0/22 | MAINT-PHONOSCOPE | SmartCity-GRB-Net-1 | NTTCOM |
| 65.115.206.0/24 | LEVEL3-MNT | route update via web | LEVEL3 |
| 66.78.228.0/22 | MNT-SCNC-1 | Smart City Networks | ARIN |
| 66.78.228.0/22 | LEVEL3-MNT | Proxy-registered route object | LEVEL3 |
| 66.78.228.0/22 | MAINT-PHONOSCOPE | SmartCity-GRB-Net-2 | NTTCOM |
| 66.78.248.0/24 | LEVEL3-MNT | route update via web | LEVEL3 |
| 67.110.78.0/23 | MAINT-PHONOSCOPE | SmartCity-GRB-Net-3 | NTTCOM |
| 67.110.78.0/23 | LEVEL3-MNT | Proxy-registered route object | LEVEL3 |
| 74.117.108.0/22 | MAINT-AS7922 | Comcast Cable Communications, Inc. | RADB |
| 216.207.58.0/24 | LEVEL3-MNT | route update via web | LEVEL3 |
| 2604:b180:10::/44 | MAINT-PSLIGHTWAVE | SmartCity-GRB-Net-IPv6-1 | NTTCOM |