AS7018 12.10.136.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.10.136.0/2412.10.137.0/2412.10.138.0/2412.10.139.0/2412.10.140.0/2412.10.141.0/2412.10.142.0/2412.10.143.0/24