AS1281 154.52.136.0/21 CIDR and IP Range Summary.ASN: 1281 - PSINet Inc.Host Count: 2046Addressable IPs: 2048154.52.136.0/24154.52.137.0/24154.52.138.0/24154.52.139.0/24154.52.140.0/24154.52.141.0/24154.52.142.0/24154.52.143.0/24