AS3257 72.245.128.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204872.245.128.0/2472.245.129.0/2472.245.130.0/2472.245.131.0/2472.245.132.0/2472.245.133.0/2472.245.134.0/2472.245.135.0/24