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 1310 iKnight codes in the database.
152-760-978 (5542)
163-050-666 (5539)
224-262-157 (2897)
424-282-901 (2663)
225-576-439 (2260)
192-728-241 (1942)
344-598-319 (1917)
390-332-585 (1642)
291-117-431 (1623)
281-654-268 (1615)
224-262-157
262-330-689
424-282-901
524-569-863
163-050-666
530-005-487
474-383-158
390-283-545
467-002-189
238-464-233
508-034-364
562-044-687
530-584-513
442-352-600
225-890-940
395-841-103
550-476-759
201-462-609
286-015-565
536-222-027
Complete list