Employee registration and insurance number rules govern portal entry, contribution filing, and benefit access under social security law. Employer registration of employees requires entry of the employee's name, Aadhaar number and other particulars on the specified portal before or on the date of employment, unless already registered under Chapter IV of the Code. An insurance number is automatically allotted for thirty days, after which the employer must update the declaration form particulars and the Corporation must provide an Aadhaar-linked identity card to the insured person and dependent family members. The employer is responsible for employee particulars, the insured person for family particulars, and the insurance number is used for contributions and benefit access under the Code.