Are EIN number owner's details public record?

EINs end up being used in a lot of different ways and can often be found by searching through publicly-available information. For example, companies required to file with the SEC will put their EIN on their filings. Services such as LexisNexis and Westlaw have searchable databases for EINs. No guarantee that those databases contain every EIN, but they should have a substantial number of them.