46 U.S.C. § 12308
Providing vessel numbering and registration information
A person may request from an authority issuing a number under this chapter the numbering and registration information of a vessel that is retrievable from vessel numbering system records of the issuing authority. When the issuing authority is satisfied that the request is reasonable and related to a boating safety purpose, the information shall be provided on paying the cost of retrieving and providing the information requested.