AS7018 12.5.136.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.5.136.0/2412.5.137.0/2412.5.138.0/2412.5.139.0/2412.5.140.0/2412.5.141.0/2412.5.142.0/2412.5.143.0/24