AS17421 221.120.72.0/21 CIDR and IP Range Summary.ASN: 17421 - Mobile Business GroupHost Count: 2046Addressable IPs: 2048221.120.72.0/24221.120.73.0/24221.120.74.0/24221.120.75.0/24221.120.76.0/24221.120.77.0/24221.120.78.0/24221.120.79.0/24