AS15917 217.31.0.0/21 CIDR and IP Range Summary.ASN: 15917 - CSC Computer Sciences LtdHost Count: 2046Addressable IPs: 2048217.31.0.0/24217.31.1.0/24217.31.2.0/24217.31.3.0/24217.31.4.0/24217.31.5.0/24217.31.6.0/24217.31.7.0/24