AS3257 206.135.144.0/20 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 4094Addressable IPs: 4096206.135.144.0/24206.135.145.0/24206.135.146.0/24206.135.147.0/24206.135.148.0/24206.135.149.0/24206.135.150.0/24206.135.151.0/24206.135.152.0/24206.135.153.0/24206.135.154.0/24206.135.155.0/24206.135.156.0/24206.135.157.0/24206.135.158.0/24206.135.159.0/24