AS51964 57.83.80.0/21 CIDR and IP Range Summary.ASN: 51964 - Orange Business Services U.S. Inc.Host Count: 2046Addressable IPs: 204857.83.80.0/2457.83.81.0/2457.83.82.0/2457.83.83.0/2457.83.84.0/2457.83.85.0/2457.83.86.0/2457.83.87.0/24