AS3257 67.199.136.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204867.199.136.0/2467.199.137.0/2467.199.138.0/2467.199.139.0/2467.199.140.0/2467.199.141.0/2467.199.142.0/2467.199.143.0/24