AS3257 213.228.192.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048213.228.192.0/24213.228.193.0/24213.228.194.0/24213.228.195.0/24213.228.196.0/24213.228.197.0/24213.228.198.0/24213.228.199.0/24