AS3257 216.193.240.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048216.193.240.0/24216.193.241.0/24216.193.242.0/24216.193.243.0/24216.193.244.0/24216.193.245.0/24216.193.246.0/24216.193.247.0/24