AS3491 63.221.136.0/21 CIDR and IP Range Summary.ASN: 3491 - PCCW Global Inc.Host Count: 2046Addressable IPs: 204863.221.136.0/2463.221.137.0/2463.221.138.0/2463.221.139.0/2463.221.140.0/2463.221.141.0/2463.221.142.0/2463.221.143.0/24