Cox Communications Inc. NETBLK-COX-ATLANTA-11 (NET-72-192-0-0-1) 72.192.0.0 - 72.223.255.255 Cox Communications NETBLK-PH-RDC-72-223-0-0 (NET-72-223-0-0-1) 72.223.0.0 - 72.223.127.255