AS3257 216.138.120.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048216.138.120.0/24216.138.121.0/24216.138.122.0/24216.138.123.0/24216.138.124.0/24216.138.125.0/24216.138.126.0/24216.138.127.0/24