List of FTP server return codes

Code	Explanation
100	Series: The requested action is being initiated, expect another reply before proceeding with a new command.
110	Restart marker replay . In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").
120	Service ready in nnn minutes.
125	Data connection already open; transfer starting.
150	File status okay; about to open data connection.
200	Command okay.
202	Command not implemented, superfluous at this site.
211	System status, or system help reply.
212	Directory status.
213	File status.
214	Help message.On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.
215	NAME system type. Where 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.
225	Data connection open; no transfer in progress.
226	Closing data connection. Requested file action successful (for example, file transfer or file abort).
227	Entering Passive Mode (h1,h2,h3,h4,p1,p2).
228	Entering Long Passive Mode (long address, port).
229	Entering Extended Passive Mode (|||port|).
230	User logged in, proceed. Logged out if appropriate.
231	User logged out; service terminated.
232	Logout command noted, will complete when transfer done.
250	Requested file action okay, completed.
257	"PATHNAME" created.
331	User name okay, need password.
332	Need account for login.
350	Requested file action pending further information
421	Service not available, closing control connection. This 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.
434	Requested host unavailable.
450	Requested file action not taken.
451	Requested action aborted. Local error in processing.
452	Requested action not taken. Insufficient storage space in system.File unavailable (e.g., file busy).
500	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	Not logged in.
532	Need account for storing files.
550	Requested action not taken. File unavailable (e.g., file not found, no access).
551	Requested action aborted. Page type unknown.
552	Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553	Requested action not taken. File name not allowed.

List of FTP commands

Below is a list of FTP commands that may be sent to an FTP host, including all commands that are standardized in RFC 959 by the IETF. All commands below are RFC 959 based unless stated otherwise. These commands differ in use between clients. For example, GET is used instead of RETR, but most clients parse this into the proper command. In this, GET is the user command and RETR is the raw command.

* ABOR - Abort an active file transfer.
* ACCT - Account information.
* ADAT - Authentication/Security Data (RFC 2228)
* ALLO - Allocate sufficient disk space to receive a file.
* APPE - Append.
* AUTH - Authentication/Security Mechanism (RFC 2228)
* CCC - Clear Command Channel (RFC 2228)
* CDUP - Change to Parent Directory.
* CONF - Confidentiality Protection Command (RFC 697)
* CWD - Change working directory.
* DELE - Delete file.
* ENC - Privacy Protected Channel (RFC 2228)
* EPRT - Specifies an extended address and port to which the server should connect. (RFC 2428)
* EPSV - Enter extended passive mode. (RFC 2428)
* FEAT - Get the feature list implemented by the server. (RFC 2389)
* HELP - Returns usage documentation on a command if specified, else a general help document is returned.
* LAND - Language Negotiation (RFC 2640)
* LIST - Returns information of a file or directory if specified, else information of the current working directory is returned.
* LPRT - Specifies a long address and port to which the server should connect. (RFC 1639)
* LPSV - Enter long passive mode. (RFC 1639)
* MDTM - Return the last-modified time of a specified file. (RFC 3659)
* MIC - Integrity Protected Command (RFC 2228)
* MKD - Make directory.
* MLSD - Provides data about exactly the object named on its command line, and no others. (RFC 3659)
* MLST - Lists the contents of a directory if a directory is named. (RFC 3659)
* MODE - Sets the transfer mode (Stream, Block, or Compressed).
* NLST - Returns a list of file names in a specified directory.
* NOOP - No operation (dummy packet; used mostly on keepalives).
* OPTS - Select options for a feature. (RFC 2389)
* PASS - Authentication password.
* PASV - Enter passive mode.
* PBSZ - Protection Buffer Size (RFC 2228)
* PORT - Specifies an address and port to which the server should connect.
* PWD - Print working directory. Returns the current directory of the host.
* QUIT - Disconnect.
* REIN - Re initializes the connection.
* REST - Restart transfer from the specified point.
* RETR - Retrieve (download) a remote file.
* RMD - Remove a directory.
* RNFR - Rename from.
* RNTO - Rename to.
* SITE - Sends site specific commands to remote server.
* SIZE - Return the size of a file. (RFC 3659)
* SMNT - Mount file structure.
* STAT - Returns the current status.
* STOR - Store (upload) a file.
* STOU - Store file uniquely.
* STRU - Set file transfer structure.
* SYST - Return system type.
* TYPE - Sets the transfer mode (ASCII/Binary).
* USER - Authentication username.