AS3257 216.133.128.0/20 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 4094Addressable IPs: 4096216.133.128.0/24216.133.129.0/24216.133.130.0/24216.133.131.0/24216.133.132.0/24216.133.133.0/24216.133.134.0/24216.133.135.0/24216.133.136.0/24216.133.137.0/24216.133.138.0/24216.133.139.0/24216.133.140.0/24216.133.141.0/24216.133.142.0/24216.133.143.0/24