AS3257 72.37.144.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204872.37.144.0/2472.37.145.0/2472.37.146.0/2472.37.147.0/2472.37.148.0/2472.37.149.0/2472.37.150.0/2472.37.151.0/24