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| CIDR range | Maintainer | Description | Source |
|---|---|---|---|
| 204.228.64.0/24 | MNT-ITHAK-Z | Ithaka | ARIN |
| 204.228.64.0/24 | MAINT-AS27506 | ITHAKA Harbors | RADB |
| 216.27.103.0/24 | MAINT-UPENN | Prefix from MAGPI IPv4 direct allocation announced by member network, Ithaka | RADB |