AS1281 154.63.16.0/21 CIDR and IP Range Summary.ASN: 1281 - PSINet Inc.Host Count: 2046Addressable IPs: 2048154.63.16.0/24154.63.17.0/24154.63.18.0/24154.63.19.0/24154.63.20.0/24154.63.21.0/24154.63.22.0/24154.63.23.0/24