AS7018 12.21.232.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.21.232.0/2412.21.233.0/2412.21.234.0/2412.21.235.0/2412.21.236.0/2412.21.237.0/2412.21.238.0/2412.21.239.0/24