AS7018 12.156.0.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.156.0.0/2412.156.1.0/2412.156.2.0/2412.156.3.0/2412.156.4.0/2412.156.5.0/2412.156.6.0/2412.156.7.0/24