AS3257 206.217.64.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048206.217.64.0/24206.217.65.0/24206.217.66.0/24206.217.67.0/24206.217.68.0/24206.217.69.0/24206.217.70.0/24206.217.71.0/24