In ESIC, IP number refers to the Insured Person number. It is a unique identification number assigned to each employee who is registered under the Employees State Insurance Scheme (ESIC) . An employee shall have only one ESI Insurance Number in his/her lifetime irrespective of the number of changes of employment. The IP number is linked to the employees Aadhaar card, which is a unique identification number issued by the Indian government. The IP number is generated when an employee is registered under the ESIC scheme, and it is used to identify the employee and provide them with benefits under the scheme.