AS1281 154.63.40.0/21 CIDR and IP Range Summary.ASN: 1281 - PSINet Inc.Host Count: 2046Addressable IPs: 2048154.63.40.0/24154.63.41.0/24154.63.42.0/24154.63.43.0/24154.63.44.0/24154.63.45.0/24154.63.46.0/24154.63.47.0/24