Call dbms_utility.db_version to get the version and its compatible version : dbms_utility « System Packages « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. System Packages
3. dbms_utility

SQL>
SQL> set echo on
SQL>
SQL> declare
  2      l_version        varchar2(255);
  3      l_compatibility varchar2(255);
  4  begin
  5      dbms_utility.db_version( l_version, l_compatibility );
  6      dbms_output.put_line( l_version );
  7      dbms_output.put_line( l_compatibility );
  8  end;
  9  /
10.2.0.1.0
10.2.0.1.0

PL/SQL procedure successfully completed.

SQL>
SQL> select dbms_utility.port_string from dual;

PORT_STRING
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IBMPC/WIN_NT-8.1.0