| 1 | 500 - Command not found |
| 2 | 501 - Wrong number of arguments |
| 3 | 502 - Unauthorized request |
| 4 | 503 - Already logged in |
| 5 | 504 - Could not convert to character set |
| 6 | 505 - Internal error |
| 7 | 506 - Authentication error |
| 8 | 507 - Command not expected |
| 9 | 508 - No such authentication mechanism |
| 10 | 509 - Malformed argument |
| 11 | 510 - No such fnetnode |
| 12 | 511 - No such fnet |
| 13 | 512 - No such transfer |
| 14 | 513 - Not supported for this fnet |
| 15 | 514 - No such search |
| 16 | 515 - Quota exceeded |
| 17 | 516 - Duplicate recipient |
| 18 | 517 - No such recipient |
| 19 | 518 - Recipient not listening |
| 20 | |
| 21 | 600 - Chat receipt |
| 22 | 601 - FN state change |
| 23 | 602 - FN name change |
| 24 | 603 - FN destroy |
| 25 | 604 - FN create |
| 26 | 605 - FN num peers change |
| 27 | 610 - Transfer create |
| 28 | 611 - Transfer state change |
| 29 | 612 - Transfer nick change |
| 30 | 613 - Transfer size change |
| 31 | 614 - Transfer error update |
| 32 | 615 - Transfer progress |
| 33 | 616 - Transfer path change |
| 34 | 617 - Transfer destroy |
| 35 | 618 - Transfer hash update |
| 36 | 620 - Search ETA change |
| 37 | 621 - Search commit |
| 38 | 622 - Search result |
| 39 | 630 - Peer create |
| 40 | 631 - Peer delete |
| 41 | 632 - Peer change |
| 42 | 640 - Client-to-client message |