AS17621 58.247.240.0/21 CIDR and IP Range Summary.ASN: 17621 - China Unicom Shanghai NetworkHost Count: 2046Addressable IPs: 204858.247.240.0/2458.247.241.0/2458.247.242.0/2458.247.243.0/2458.247.244.0/2458.247.245.0/2458.247.246.0/2458.247.247.0/24