AS10139 121.54.8.0/21 CIDR and IP Range Summary.ASN: 10139 - Smart Broadband Inc.Host Count: 2046Addressable IPs: 2048121.54.8.0/24121.54.9.0/24121.54.10.0/24121.54.11.0/24121.54.12.0/24121.54.13.0/24121.54.14.0/24121.54.15.0/24