AS7018 12.28.136.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.28.136.0/2412.28.137.0/2412.28.138.0/2412.28.139.0/2412.28.140.0/2412.28.141.0/2412.28.142.0/2412.28.143.0/24