AS7018 12.15.56.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.15.56.0/2412.15.57.0/2412.15.58.0/2412.15.59.0/2412.15.60.0/2412.15.61.0/2412.15.62.0/2412.15.63.0/24