AT&T Services, Inc. ATT (NET-12-0-0-0-1) 12.0.0.0 - 12.255.255.255 AT&T Services, Inc. ATTSVCM-12-171-80-0 (NET-12-171-80-0-1) 12.171.80.0 - 12.171.95.255 EMERGENCY 24 EMERGENC44-94 (NET-12-171-94-0-1) 12.171.94.0 - 12.171.94.255