MFN can help with common code queries.
A common code is nine-digit identification code issued jointly by CEDEL and Euroclear. As of January 1991 common codes replaced the earlier separate CEDEL and Euroclear codes.
A commom code is Issued in Luxembourg, replaces CEDEL and Euroclear codes.
Many others exclusively use ISIN number codes to identify their securities.
Bonds, Stocks and Financial Instruments, usually have one or more identifier codes, issued by various clearing houses or other agencies. The purpose of these identifiers is to prevent confusion when discussing a particular security, particularly a bond (because a company will usually only have one class of stock, but can have many different bond issues). This is a list of what the various securities codes stand for, who issues them, and what their structure is.