This website gives you the ability to list your iKnights code for free and add any of the members to your guild. You can resubmit your code to put it to the top once every hour. The top submitters list shows the top 10 most submitted codes.
Currently there are 1352 iKnight codes in the database.
152-760-978 (13596)
163-050-666 (13593)
224-262-157 (5132)
618-133-533 (3819)
424-282-901 (3294)
225-576-439 (2507)
639-916-519 (1957)
192-728-241 (1942)
344-598-319 (1917)
390-332-585 (1642)
163-050-666
390-283-545
220-153-042
377-511-905
639-916-519
637-608-123
641-054-793
640-547-156
618-133-533
224-262-157
640-216-306
637-189-191
639-616-519
640-590-918
417-527-041
635-750-813
573-514-719
636-254-958
159-965-854
637-660-452
Complete list