AT&T Services, Inc. ATT (NET-12-0-0-0-1) 12.0.0.0 - 12.255.255.255 AT&T Services, Inc. ATTWORLD-MIS-11-80 (NET-12-11-80-0-1) 12.11.80.0 - 12.11.87.255 ACC-INTERACTIVE CLASSIFIEDS ACC-INTE42-82 (NET-12-11-82-0-1) 12.11.82.0 - 12.11.83.255