AS12255 138.133.224.0/21 CIDR and IP Range Summary.ASN: 12255 - Amgen Inc.Host Count: 2046Addressable IPs: 2048138.133.224.0/24138.133.225.0/24138.133.226.0/24138.133.227.0/24138.133.228.0/24138.133.229.0/24138.133.230.0/24138.133.231.0/24