AS51964 57.83.16.0/21 CIDR and IP Range Summary.ASN: 51964 - Orange Business Services U.S. Inc.Host Count: 2046Addressable IPs: 204857.83.16.0/2457.83.17.0/2457.83.18.0/2457.83.19.0/2457.83.20.0/2457.83.21.0/2457.83.22.0/2457.83.23.0/24