AS3257 194.64.136.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048194.64.136.0/24194.64.137.0/24194.64.138.0/24194.64.139.0/24194.64.140.0/24194.64.141.0/24194.64.142.0/24194.64.143.0/24