AS7018 12.172.232.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.172.232.0/2412.172.233.0/2412.172.234.0/2412.172.235.0/2412.172.236.0/2412.172.237.0/2412.172.238.0/2412.172.239.0/24