AS17621 58.247.216.0/21 CIDR and IP Range Summary.ASN: 17621 - China Unicom Shanghai NetworkHost Count: 2046Addressable IPs: 204858.247.216.0/2458.247.217.0/2458.247.218.0/2458.247.219.0/2458.247.220.0/2458.247.221.0/2458.247.222.0/2458.247.223.0/24