AS7018 12.203.16.0/20 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 4094Addressable IPs: 409612.203.16.0/2412.203.17.0/2412.203.18.0/2412.203.19.0/2412.203.20.0/2412.203.21.0/2412.203.22.0/2412.203.23.0/2412.203.24.0/2412.203.25.0/2412.203.26.0/2412.203.27.0/2412.203.28.0/2412.203.29.0/2412.203.30.0/2412.203.31.0/24