AS3257 66.17.144.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204866.17.144.0/2466.17.145.0/2466.17.146.0/2466.17.147.0/2466.17.148.0/2466.17.149.0/2466.17.150.0/2466.17.151.0/24