199.68.0.0 - 199.68.5.0 Care Network Inc. (NETBLK-CARENETWORK) 199.68.8.0 - 199.68.13.0 Dukane Corporation (NETBLK-TBLK-DUKANE) 199.68.16.0 - 199.68.25.0 Medimmune, Inc. (NETBLK-TBLK-MEDIMMUNE) 199.68.32.0 - 199.68.52.0 Erie Insurance Group (NETBLK-BLK-ERIEINS ) 199.68.64.0 - 199.68.101.0 GMAC Mortgage Corp (NETBLK-TBLK-GMACM)