{"data":{"id":"us/33-cfr-174.23","jurisdiction":"us","citation":"33 CFR 174.23","heading":"Form of number.","body":"(a) Each number must consist of two capital letters denoting the State of the issuing authority, as specified in appendix A of part 173 of this chapter, followed by—\n(1) Not more than four numerals followed by not more than two capital letters (example: NH 1234 BD); or\n(2) Not more than three numerals followed by not more than three capital letters (example: WN 567 EFG).\n(b) A number suffix must not include the letters “I”, “O”, or “Q,” which may be mistaken for numerals.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER S—BOATING SAFETY","PART 174—STATE NUMBERING AND CASUALTY REPORTING SYSTEMS","Subpart B—Numbering System Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"ffe531cc8db3ae09bb6af03b077f756dafcceb23c4433c1a6ef868d3053974b3","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-174.21","next":"us/33-cfr-174.25"},"notice":"GroundRules: Original legal text. Not legal advice."}