AS3257 216.133.80.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048216.133.80.0/24216.133.81.0/24216.133.82.0/24216.133.83.0/24216.133.84.0/24216.133.85.0/24216.133.86.0/24216.133.87.0/24