AS7018 12.17.128.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.17.128.0/2412.17.129.0/2412.17.130.0/2412.17.131.0/2412.17.132.0/2412.17.133.0/2412.17.134.0/2412.17.135.0/24