AT&T Corp. SBCIS-SBIS-6BLK (NET-99-151-192-0-1) 99.151.192.0 - 99.156.191.255 Private Customer - AT&T Internet Services SBC-99-154-130-0-27-1703070456 (NET-99-154-130-0-1) 99.154.130.0 - 99.154.130.31