AS7018 12.31.16.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.31.16.0/2412.31.17.0/2412.31.18.0/2412.31.19.0/2412.31.20.0/2412.31.21.0/2412.31.22.0/2412.31.23.0/24