AS3257 67.220.144.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204867.220.144.0/2467.220.145.0/2467.220.146.0/2467.220.147.0/2467.220.148.0/2467.220.149.0/2467.220.150.0/2467.220.151.0/24