AS23397 164.74.144.0/20 CIDR and IP Range Summary.ASN: 23397 - Chicago Board of TradeHost Count: 4094Addressable IPs: 4096164.74.144.0/24164.74.145.0/24164.74.146.0/24164.74.147.0/24164.74.148.0/24164.74.149.0/24164.74.150.0/24164.74.151.0/24164.74.152.0/24164.74.153.0/24164.74.154.0/24164.74.155.0/24164.74.156.0/24164.74.157.0/24164.74.158.0/24164.74.159.0/24