AS7018 12.221.240.0/20 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 4094Addressable IPs: 409612.221.240.0/2412.221.241.0/2412.221.242.0/2412.221.243.0/2412.221.244.0/2412.221.245.0/2412.221.246.0/2412.221.247.0/2412.221.248.0/2412.221.249.0/2412.221.250.0/2412.221.251.0/2412.221.252.0/2412.221.253.0/2412.221.254.0/2412.221.255.0/24