AS3257 217.145.112.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 2048217.145.112.0/24217.145.113.0/24217.145.114.0/24217.145.115.0/24217.145.116.0/24217.145.117.0/24217.145.118.0/24217.145.119.0/24