AT&T Corp. SBCIS-SBIS (NET-99-10-64-0-1) 99.10.64.0 - 99.75.191.255 Private Customer - AT&T Internet Services SBC-99-30-228-176-28-1801102421 (NET-99-30-228-176-1) 99.30.228.176 - 99.30.228.191