The Employer Identification Number or EIN is a unique nine digit number assigned by the Internal Revenue Service to business entities operating in the United States for the purposes of identification. Employment Identification numbers do not expire.
Once an EIN has been issued to an entity, it will not be reissued. If your company needs to find out the employment identification numbers for other companies then there are services available that can facilitate this. For example, one such service that might be of interest to you or your company is supplied by a company called EIN Finder. You would be recommended to take a look at there web site www.einfinder.com if you want to find out more about there service and how the service they offer works. There site is quite small and designed with a very user friendly format. It is easy to find out everything you need to know, and they even offer you a free trial. 
