AT&T Services, Inc. ATT (NET-12-0-0-0-1) 12.0.0.0 - 12.255.255.255 AT&T Services, Inc. ATTSVCM-12-179-176-0 (NET-12-179-176-0-1) 12.179.176.0 - 12.179.191.255 AMATEUR ATHLETIC UNION AMATEUR647-190-128 (NET-12-179-190-128-1) 12.179.190.128 - 12.179.190.255