AS7018 12.31.128.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.31.128.0/2412.31.129.0/2412.31.130.0/2412.31.131.0/2412.31.132.0/2412.31.133.0/2412.31.134.0/2412.31.135.0/24