AS3257 66.54.176.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204866.54.176.0/2466.54.177.0/2466.54.178.0/2466.54.179.0/2466.54.180.0/2466.54.181.0/2466.54.182.0/2466.54.183.0/24