AS3257 77.77.136.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204877.77.136.0/2477.77.137.0/2477.77.138.0/2477.77.139.0/2477.77.140.0/2477.77.141.0/2477.77.142.0/2477.77.143.0/24