AS7018 12.172.168.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.172.168.0/2412.172.169.0/2412.172.170.0/2412.172.171.0/2412.172.172.0/2412.172.173.0/2412.172.174.0/2412.172.175.0/24