§ 174.23. Form of number.
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/us/cfr/t33/s§ 174.23·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(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---
(1)Not more than four numerals followed by not more than two capital letters (example: NH 1234 BD); or
(2)Not more than three numerals followed by not more than three capital letters (example: WN 567 EFG).
(b)A number suffix must not include the letters "I", "O", or "Q," which may be mistaken for numerals.