AS17228 12.129.120.0/21 CIDR and IP Range Summary.ASN: 17228 - AT&T Enhanced Network ServicesHost Count: 2046Addressable IPs: 204812.129.120.0/2412.129.121.0/2412.129.122.0/2412.129.123.0/2412.129.124.0/2412.129.125.0/2412.129.126.0/2412.129.127.0/24