AS17638 123.151.80.0/21 CIDR and IP Range Summary.ASN: 17638 - ASN for TIANJIN Provincial Net of CTHost Count: 2046Addressable IPs: 2048123.151.80.0/24123.151.81.0/24123.151.82.0/24123.151.83.0/24123.151.84.0/24123.151.85.0/24123.151.86.0/24123.151.87.0/24