AS3257 74.121.80.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 204874.121.80.0/2474.121.81.0/2474.121.82.0/2474.121.83.0/2474.121.84.0/2474.121.85.0/2474.121.86.0/2474.121.87.0/24