There are numberous ‘EIN searching services’ that one can find online. One of the main ones is FEINSearch.com. This site offers EIN lookup and verification service for professionals and companies that need tax id information. They have a database of over 12 million EINs, which gives one the best chance of finding the company’s EIN of their choice. They offer a free trial of five searches, but after that, they have various subscription options that one can find on their ‘subscription options’ page.