AS13 155.20.136.0/21 CIDR and IP Range Summary.ASN: 13 - Headquarters USAISCHost Count: 2046Addressable IPs: 2048155.20.136.0/24155.20.137.0/24155.20.138.0/24155.20.139.0/24155.20.140.0/24155.20.141.0/24155.20.142.0/24155.20.143.0/24