AS3257 209.87.72.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048209.87.72.0/24209.87.73.0/24209.87.74.0/24209.87.75.0/24209.87.76.0/24209.87.77.0/24209.87.78.0/24209.87.79.0/24