AS3257 66.54.136.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204866.54.136.0/2466.54.137.0/2466.54.138.0/2466.54.139.0/2466.54.140.0/2466.54.141.0/2466.54.142.0/2466.54.143.0/24