AS7018 12.129.136.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.129.136.0/2412.129.137.0/2412.129.138.0/2412.129.139.0/2412.129.140.0/2412.129.141.0/2412.129.142.0/2412.129.143.0/24