AS3257 74.1.56.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204874.1.56.0/2474.1.57.0/2474.1.58.0/2474.1.59.0/2474.1.60.0/2474.1.61.0/2474.1.62.0/2474.1.63.0/24