AS7018 12.156.128.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.156.128.0/2412.156.129.0/2412.156.130.0/2412.156.131.0/2412.156.132.0/2412.156.133.0/2412.156.134.0/2412.156.135.0/24