AS20404 158.81.136.0/21 CIDR and IP Range Summary.ASN: 20404 - NRG Energy Inc.Host Count: 2046Addressable IPs: 2048158.81.136.0/24158.81.137.0/24158.81.138.0/24158.81.139.0/24158.81.140.0/24158.81.141.0/24158.81.142.0/24158.81.143.0/24