The ATF has stringent rules about what the numbers and letter in an FFL number represent. This guide will help you verify that you have a valid FFL.
An FFL Number MUST be 15 digits long, not counting the dashes.
-- Example FFL Number: 4-65-934-01-3M-01768
1st set must be a 1 digit number (Part of the RDS Key). This number represents one of the 7 regions of the country where the FFL is located.
6. North Atlantic
2nd set must be a 2 digit number (Part of the RDS Key). This number represents the IRS district where the FFL is located.
3rd set must be a 3 digit number (Geographical Location). This number represents the Federal Information Processing Standards (FIPS) code where the FFL is located.
4th set must be a 2 digit number. This number represents the FFL Type.
5th set must be a single number 0 through 9 and a single letter A through M except I (FFL Expiration Date)
The number refers to the last number of the year of expiration. (For example, 1 could mean 2011 or 2021)
The letter refers to the month of expiration. The letters go A through M, skipping “I.”
A – January
B – February
C – March
D – April
E – May
F – June
G – July
H – August
J – September
K – October
L – November
M – December
(Example: An FFL with an expiration of 3M means the license expires on 12/1/23.)
6th set must be a 5 digit number (Part of the RDS Key). This number is the unique code for each FFL.