AS3257 66.54.139.128/29 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 6Addressable IPs: 8 66.54.139.12966.54.139.13066.54.139.13166.54.139.13266.54.139.13366.54.139.13466.54.139.13566.54.139.136