AS7018 12.203.128.0/20 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 4094Addressable IPs: 409612.203.128.0/2412.203.129.0/2412.203.130.0/2412.203.131.0/2412.203.132.0/2412.203.133.0/2412.203.134.0/2412.203.135.0/2412.203.136.0/2412.203.137.0/2412.203.138.0/2412.203.139.0/2412.203.140.0/2412.203.141.0/2412.203.142.0/2412.203.143.0/24