AS3257 67.220.128.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204867.220.128.0/2467.220.129.0/2467.220.130.0/2467.220.131.0/2467.220.132.0/2467.220.133.0/2467.220.134.0/2467.220.135.0/24