AS3257 66.17.176.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204866.17.176.0/2466.17.177.0/2466.17.178.0/2466.17.179.0/2466.17.180.0/2466.17.181.0/2466.17.182.0/2466.17.183.0/24