| 100 | Codes The requested action is being taken. Expect a reply before proceeding with a new command. |
| 110 | Restart marker reply. |
| 120 | Service ready in (n) minutes. |
| 125 | Data connection already open, transfer starting. |
| 150 | File status okay, about to open data connection. |
| 200 | Codes The requested action has been successfully completed. Command okay. |
| 202 | Command not implemented |
| 211 | System status, or system help reply. |
| 212 | Directory status. |
| 213 | File status. |
| 214 | Help message. |
| 215 | NAME system type. (NAME is an official system name from the list in the Assigned Numbers document.) |
| 220 | Service ready for new user. |
| 221 | Service closing control connection. (Logged out if appropriate.) |
| 225 | Data connection open, no transfer in progress. |
| 226 | Closing data connection. Requested file action successful (file transfer, abort, etc.). |
| 227 | Entering Passive Mode |
| 230 | User logged in, proceed. |
| 250 | Requested file action okay, completed. |
| 257 | "PATHNAME" created. |
| 300 | Codes The command has been accepted, but the requested action is being held pending receipt of further information. |
| 331 | User name okay, need password. |
| 332 | Need account for login. |
| 350 | Requested file action pending further information. |
| 400 | Codes The command was not accepted and the requested action did not take place. The error condition is temporary, however, and the action may be requested again. |
| 421 | Service not available, closing control connection. (May be a reply to any command if the service knows it must shut down.) |
| 425 | Can't open data connection. |
| 426 | Connection closed, transfer aborted. |
| 450 | Requested file action not taken. File unavailable (e.g., file busy). |
| 451 | Requested action aborted, local error in processing. |
| 452 | Requested action not taken. Insufficient storage space in system. |
| 500 | Codes The command was not accepted and the requested action did not take place. Syntax error, command unrecognized. This may include errors such as command line too long. |
| 501 | Syntax error in parameters or arguments. |
| 502 | Command not implemented. |
| 503 | Bad sequence of commands. |
| 504 | Command not implemented for that parameter. |
| 530 | User not logged in. |
| 532 | Need account for storing files. |
| 550 | Requested action not taken. File unavailable (e.g., file not found, no access). |
| 552 | Requested file action aborted, storage allocation exceeded |
| 553 | Requested action not taken. Illegal file name. |
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