AS3257 66.166.56.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204866.166.56.0/2466.166.57.0/2466.166.58.0/2466.166.59.0/2466.166.60.0/2466.166.61.0/2466.166.62.0/2466.166.63.0/24