AS37963 121.0.16.0/20 CIDR and IP Range Summary.ASN: 37963 - Hangzhou Alibaba Advertising Co. Ltd.Host Count: 4094Addressable IPs: 4096121.0.16.0/24121.0.17.0/24121.0.18.0/24121.0.19.0/24121.0.20.0/24121.0.21.0/24121.0.22.0/24121.0.23.0/24121.0.24.0/24121.0.25.0/24121.0.26.0/24121.0.27.0/24121.0.28.0/24121.0.29.0/24121.0.30.0/24121.0.31.0/24