AS3257 213.228.232.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048213.228.232.0/24213.228.233.0/24213.228.234.0/24213.228.235.0/24213.228.236.0/24213.228.237.0/24213.228.238.0/24213.228.239.0/24