AS3257 64.81.144.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204864.81.144.0/2464.81.145.0/2464.81.146.0/2464.81.147.0/2464.81.148.0/2464.81.149.0/2464.81.150.0/2464.81.151.0/24