ORA-00000 to ORA-00899 Seem to be init parameter/configuration
ORA-00900 to ORA-01499 Loosely related to syntax problems
ORA-01500 to ORA-02099 Loosely related to syntax problems
ORA-02100 to ORA-04099 OS related/syntax problems
ORA-04100 to ORA-07499
ORA-04100 - ORA-06423 Network/connection related
ORA-06430 - ORA-06449 OS related
ORA-06500 - ORA-06593 PL/SQL related
ORA-06600 - ORA-06979 Driver/TNS related
ORA-07200 - ORA-09989 OS related
ORA-10560 - ORA-12097 Database problems/syntax problems
ORA-12150 - ORA-12299 TNS network problems
ORA-12300 - ORA-12399 Syntax problems
ORA-12400 - ORA-12497 Database problems/syntax problems
ORA-12500 - ORA-12699 TNS network problems
ORA-12700 - ORA-36960 Database problems/syntax problems