AS3257 72.29.216.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204872.29.216.0/2472.29.217.0/2472.29.218.0/2472.29.219.0/2472.29.220.0/2472.29.221.0/2472.29.222.0/2472.29.223.0/24