Dear Vikram,
Now ESIC Entered in Oline 17 Degits Code. The Code 00-00-000000-000-0000
The First Two Degits Shows - Region Code of the Establishment
Second Two Degits Shows - Sub Region Code of the Establishment
Third Six Degits Shows - Estabishment Number
Fourth Three Degits Shows - Sub Code of the Branches
You may apply an application from your establishment where your branches located in india (where esic coverage area). You may contact your Concered ESIC Regional Office for Furture Correspondance. They will help to you How to allot Sub Region Code / Sub Branches Code of your establishment and more details you may contact esic Help Line for furture.
thank you