AS3257 217.204.72.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048217.204.72.0/24217.204.73.0/24217.204.74.0/24217.204.75.0/24217.204.76.0/24217.204.77.0/24217.204.78.0/24217.204.79.0/24