AS3257 72.245.72.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204872.245.72.0/2472.245.73.0/2472.245.74.0/2472.245.75.0/2472.245.76.0/2472.245.77.0/2472.245.78.0/2472.245.79.0/24