AS17621 112.64.176.0/21 CIDR and IP Range Summary.ASN: 17621 - China Unicom Shanghai NetworkHost Count: 2046Addressable IPs: 2048112.64.176.0/24112.64.177.0/24112.64.178.0/24112.64.179.0/24112.64.180.0/24112.64.181.0/24112.64.182.0/24112.64.183.0/24