(Direct link to the ICAO document.
Lists in different languages) This is a list of aircraft registration prefixes used by civil aircraft: The 1928 prefixes have been amended and added to over the years, with the current markings being: 9H-111 to 9H-99999 a group of three to five characters, which characters can be a combination of capital letters in Romancharacter and/or Arabic numbers Some post-1928 prefixes have been retired due to various reasons, including decolonization and the dissolution of sovereign states.
Note: in the suffix pattern, n represents a number, x represents a letter