UAN or Universal Account Number is a unique identification number allotted to each and every member of EPFO. It is issued by the Ministry of Labour and Employment. A member can have only one UAN during his service period where all EPF accounts are linked with his UAN.
When an employee changes his job, his EPF account number and member ID changes but UAN remains the same. In the event of allotment of two UANs, the member should inform his employer as well as EPFO instantly so that old UAN can be deactivated and the previous EPF corpus is transferred to the new PF account.