AS7018 12.139.48.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.139.48.0/2412.139.49.0/2412.139.50.0/2412.139.51.0/2412.139.52.0/2412.139.53.0/2412.139.54.0/2412.139.55.0/24