AS51964 57.66.72.0/21 CIDR and IP Range Summary.ASN: 51964 - Orange Business Services U.S. Inc.Host Count: 2046Addressable IPs: 204857.66.72.0/2457.66.73.0/2457.66.74.0/2457.66.75.0/2457.66.76.0/2457.66.77.0/2457.66.78.0/2457.66.79.0/24