Comparison of file transfer protocols

This article lists communication protocols that are designed for file transfer over a telecommunications network.

For file sharing software, see Comparison of file sharing applications. For file synchronization software, see Comparison of file synchronization software.

Protocols for shared file systems—such as 9P and the Network File System—are beyond the scope of this article, as are file synchronization protocols.

Protocols for packet-switched networks

A packet-switched network transmits data that is divided into units called packets. A packet comprises a header (which describes the packet) and a payload (the data). The Internet is a packet-switched network, and most of the protocols in this list are designed for its protocol stack, the IP protocol suite.

They use one of two transport layer protocols: the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). In the tables below, the "Transport" column indicates which protocol(s) the transfer protocol uses at the transport layer. Some protocols designed to transmit data over UDP also use a TCP port for oversight.

The "Server port" column indicates the port from which the server transmits data. In the case of FTP, this port differs from the listening port. Some protocols—including FTP, FTP Secure, FASP, and Tsunami—listen on a "control port" or "command port", at which they receive commands from the client.

Similarly, the encryption scheme indicated in the "Encryption" column applies to transmitted data only, and not to the authentication system.

Overview
Color key:     International standard     Internet Standard     Proposed Standard     Internet Draft
ProtocolOriginal authorFirst publishedProtocol suiteStandardRefs
Full nameAbbreviation
BitTorrentBTBram Cohen2001N/ANo[1]
CCSDS File Delivery ProtocolCFDPN/AISO 17355:2007
CCSDS 727.0-B-4
Cross File TransferCFTN/ANo
EForwardN/ANo
Ether File Transfer ProtocolEFTPJohn Shoch1979PARC Universal PacketNo[2][3]
Fast and Secure ProtocolFASPYing Xu, Michelle Munson, Serban Simu2007N/ANo[4]
File Delivery over Unidirectional TransportFLUTEInternet Society2004N/ARFC 6726[5]
File Service ProtocolFSPWen-King Su1991N/ANo[6][7]
File Transfer Access and ManagementFTAMISO 8571-4:1988
File Transfer ProtocolFTPAbhay Bhushan1971Internet protocol suiteRFC 959[8]
FTP SecureFTPSInternet Society1997Internet protocol suiteRFC 2228, 4217[9][10]
HTTP SecureHTTPSTaher Elgamal et al.1995Internet protocol suiteRFC 7230[11][12]
Host Unix Linkage File TransferHULFT?1993N/ANo
Hypertext Transfer ProtocolHTTPTim Berners-Lee et al.1991Internet protocol suiteRFC 7231[13][14]
Micro Transport ProtocolμTPLudvig Strigeus, Greg Hazel, Stanislav Shalunov, Arvid Norberg, Bram Cohen2007N/ANo[15][16]
Multicast Dissemination ProtocolMDPNo
Multicast File Transfer ProtocolMFTPC. Kenneth Miller et al.1995N/AIETF Draft (1998)[17]
NACK-Oriented Reliable Multicast Transport ProtocolNORMRFC 5740
Odette File Transfer ProtocolOFTPOrganisation for Data Exchange by Tele Transmission in Europe1986X.25RFC 6726[18]
Odette File Transfer Protocol 2OFTP2Organisation for Data Exchange by Tele Transmission in Europe2007X.25, Internet protocol suiteRFC 5024 (V1.3)[19]
Reliable Blast UDPRBUDPEric He et al.2002N/ANo[20]
Remote copyrcp?1982Internet protocol suiteNo[21]
Secure copySCPTatu Ylönen?Secure ShellNo[22]
Secure Hypertext Transfer ProtocolS-HTTPIETF Web Transaction Security Working Group1999N/ARFC 2660[23]
Simple Asynchronous File TransferSAFTUlli Horlacher1995N/ANo[24][25]
Simple File Transfer ProtocolSFTPMark K. Lottor1984N/ARFC 913[26]
SSH file transfer protocolSFTPTatu Ylönenc. 1997Secure ShellIETF Draft (2006)[27]
T.127T.127??N/AITU T.127
Trivial File Transfer ProtocolTFTPNoel Chiappa1980Internet protocol suiteRFC 1350[28]
Tsunami UDP ProtocolTsunamiMark Meiss et al.2002N/ANo[29][30]
Tus open protocol for resumable file uploadstusFelix Geisendörfer, Marius Kleidl et al.2014N/ANo[31][32]
UDP-based Data Transfer ProtocolUDTYunhong Gu2004N/ANo
UDP-based File Transfer ProtocolUFTPDennis Bush2001N/ANo[33]
Unix-to-Unix CopyUUCPMike Lesk1979N/ANo
Warp Speed Data TransferWDTLaurent Demailly et al.2015N/ANo[34]

Features

The "Managed" column indicates whether the protocol is designed for managed file transfer (MFT). MFT protocols prioritise secure transmission in industrial applications that require such features as auditable transaction records, monitoring, and end-to-end data security. Such protocols may be preferred for electronic data interchange.[35]

ProtocolEncryption
(data)		Transfer
resuming		Multicast
capable		ManagedRefs
BitTorrentNone[lower-alpha 1]YesPeer-to-peerNo[36][37]
Cross File Transfer (CFT)TLS / SSLYes [38][39]
EForwardProprietaryYes[40]
Ether File Transfer Protocol (EFTP)None?NoNo[41]
Fast and Secure Protocol (FASP)AES-256 / AES-192 / AES-128YesNo[42][43][44]
File Delivery over Unidirectional Transport (FLUTE)Optional/Unspecified[lower-alpha 2]NoYes[45][46][47]
File Service Protocol (FSP)NoneYesNoNo[48][49]
File Transfer Access and Management (FTAM)?[lower-alpha 3][50]
File Transfer Protocol (FTP)NoneYes[lower-alpha 4]NoNo[51][52][53][54][55]
FTP Secure (FTPS)TLS / SSLYesNoNo
HTTP Secure (HTTPS)TLS / SSLYesNoNo[14][56][57]
Host Unix Linkage File Transfer (HULFT)AES?No[58][59][60][61]
Hypertext Transfer Protocol (HTTP)None
(see HTTPS and S-HTTP)		YesNoNo[14][62]
Micro Transport Protocol (μTP)NoneYesPeer-to-peerNo[15]
Multicast Dissemination Protocol (MDP)NoneYesYes[63][64]
Multicast File Transfer Protocol (MFTP)NoneYesYesNo[65][66]
NACK-Oriented Reliable Multicast Transport Protocol (NORM)IPsecYesYes[67][68]
Odette File Transfer Protocol (OFTP)NoneYes[69]
Odette File Transfer Protocol 2 (OFTP2)TLSYes[70]
Reliable Blast UDP (RBUDP)NoneNoNo[20][71][72]
Remote copy (rcp)NoneNoNoNo[73]
Secure copy (SCP)Secure ShellNoNoNo
Secure Hypertext Transfer Protocol (S-HTTP)CMS / MOSS / otherNoNoNo[74]
Simple Asynchronous File Transfer (SAFT)PGP?NoNo[24][25][75]
Simple File Transfer Protocol (SFTP)NoneYesNoNo[76]
SSH file transfer protocol (SFTP)Secure ShellYesNoNo[77]
T.127NoneYesYesNo[78][79][80]
Trivial File Transfer Protocol (TFTP)NoneNoNoNo[81]
Tsunami UDP ProtocolNoneNoNoNo[82][83]
Tus open protocol for resumable file uploads (tus)Optional/Unspecified[lower-alpha 5]YesNoNo[31][32]
UDP-based Data Transfer Protocol (UDT)ExperimentalNoNoNo[83][84][85]
UDP-based File Transfer Protocol (UFTP)AES-256 / AES-128 / 3DES / DES[lower-alpha 6]YesYesNo[83][33][86]
Unix-to-Unix Copy (UUCP)NoneSome[lower-alpha 7]NoNo[87][88]
Warp Speed Data Transfer (WDT)AES-128 (OFB / CTR)YesNoNo[89][90][91]
  1. Some implementations can obfuscate traffic using RC4 et al. See BitTorrent protocol encryption.
  2. RFC 6726 suggests IPSec as one option.
  3. One implementation, Fujitsu openFT, applies AES.
  4. RFC 1123 (1989) extends and corrects the provisions for restart/resume that were published in RFC 959 (1985). RFC 3659 (2007) provides for resuming in stream mode.
  5. It's recommended to use HTTPS provided by a webserver, proxy, or SSL terminator.
  6. These are the options in the reference implementation, which uses OpenSSL.
  7. The BNU implementation of UUCP can resume an interrupted file transfer.

Ports

In the table below, the data port is the network port or range of ports through which the protocol transmits file data. The control port is the port used for the dialogue of commands and status updates between client and server.

The column "Assigned by IANA" indicates whether the port is listed in the Service Name and Transport Protocol Port Number Registry, which is curated by the Internet Assigned Numbers Authority (IANA). IANA devotes each port number in the registry to a specific service with a specific transport protocol. The table below lists the transport protocol in the "Transport" column.

ProtocolData portControl portAssigned
by IANA		AssigneeRefs
ServerClientTransport ServerClientTransport
BitTorrent6881[lower-alpha 1]6881TCP68816881TCPNoN/A[92]
CCSDS File Delivery Protocol (CFDP)
Cross File Transfer (CFT)1761[lower-alpha 2]TCP / X.25[93][94]
EForward2181TCP / UDP[95]
Ether File Transfer Protocol (EFTP)N/AN/ANoneN/AN/ANoneN/AN/A
Fast and Secure Protocol (FASP)≥33001UDP22TCPNoN/A[92]
File Delivery over Unidirectional Transport (FLUTE)4001UDPNoN/A[92]
File Service Protocol (FSP)Chosen by user[lower-alpha 3]UDPNoN/A[92]
File Transfer Access and Management (FTAM)4800 / 102TCP[96]
File Transfer Protocol (FTP)Active mode2020TCP[lower-alpha 4]21≥1024TCPYesJon Postel[92]
Passive mode≥1024[lower-alpha 5]≥1024
FTP Secure (FTPS)989TCP990TCPYesChristopher Allen[92]
HTTP Secure (HTTPS)443TCPTCPYesIESG[92]
Host Unix Linkage File Transfer (HULFT)30000TCPTCPNoN/A[92]
Hypertext Transfer Protocol (HTTP)80TCPTCPYesTim Berners-Lee[92]
Micro Transport Protocol (μTP)UDPNoN/A[92]
Multicast Dissemination Protocol (MDP)Chosen by userUDP[97][98]
Multicast File Transfer Protocol (MFTP)5402UDPYesSteve Bannister[92]
NACK-Oriented Reliable Multicast Transport Protocol (NORM)UDP[99][100]
Odette File Transfer Protocol (OFTP)3305TCP / X.25TCP / X.25[101]
Odette File Transfer Protocol 2 (OFTP2)6619TCP / X.25TCP / X.25[102]
Reliable Blast UDP (RBUDP)Chosen by userUDPNoN/A[92]
Remote copy (rcp)514TCPTCPYes[92]
Secure copy (SCP)22TCPTCPYes[92]
Secure Hypertext Transfer Protocol (S-HTTP)80TCPTCPNoN/A[92]
Simple Asynchronous File Transfer (SAFT)487TCPYesUlli Horlacher[92]
Simple File Transfer Protocol (SFTP)115TCPTCPYesMark Lottor[92]
SSH file transfer protocol (SFTP)22TCPTCPYes[92]
T.1271503TCPTCPYesJim Johnston[92]
Trivial File Transfer Protocol (TFTP)69UDPYesDavid Clark[92]
Tsunami UDP ProtocolChosen by userUDPTCPNoN/A[92]
Tus open protocol for resumable file uploads (tus)80[lower-alpha 6]TCPTCPNoN/A[92]
UDP-based Data Transfer Protocol (UDT)Chosen by serverUDPNoN/A[92]
UDP-based File Transfer Protocol (UFTP)1044UDPNoN/A[92]
Unix-to-Unix Copy (UUCP)540TCPTCPYes[92]
Warp Speed Data Transfer (WDT)Chosen by server or by userTCPTCPNoN/A[92]
  1. Typically, if port 6881 is unavailable as a listening port, the peer incrementally tries 6882–6889. Another port may be specified in software.
  2. 1761 is the default port, but 1761–1768 are allocated by IANA.
  3. UDP port 21 is sometimes chosen for FSP.
  4. FTP was originally designed for NCP, a protocol used on ARPANET before the advent of TCP. The TCP implementation of FTP was standardized in RFC 959.
  5. The server listens on TCP port 21 (the control port), and the client sends commands to this port from a random port above 1023. To transfer data in active mode, the server initiates a connection from port 20 to the client at the randomly selected port number.
    In passive mode, the client uses a random port above 1023 as a control port, and from this initiates file transfer. The server sends or receives data from a randomly selected port above 1023, and the client sends or receives data from one port number above its own randomly selected control port.
  6. Can be chosen by user, but layers on top of HTTP(S) so often 80/443

Serial protocols
A 9-pin to 25-pin RS-232 adapter cable

The following protocols were designed for serial communication, mostly for the RS-232 standard. They are used for uploading and downloading computer files via modem or serial cable (e.g., by null modem or direct cable connection). UUCP is one protocol that can operate with either RS-232 or the Transmission Control Protocol as its transport. The Kermit protocol can operate over any computer-to-computer transport: direct serial, modem, or network (notably TCP/IP, including on connections secured by SSL, SSH, or Kerberos). OBject EXchange is a protocol for binary object wireless transfer via the Bluetooth standard. Bluetooth was conceived as a wireless replacement for RS-232.

Overview
ProtocolAuthorFirst releasedLicenseDescriptionRefs
BiModemErik Labs1989Bi-directional transfers.
BLASTCommunications Research Group?Powerful protocol originating on minicomputers for telemetry purposes. Later found use on micros.[103]
C-MODEMLavio Pareschi1989Packet lengths from 32 to 4096 bytes, optional (but normally used) streaming mode.
B protocolCompuServe1981Offered file transfer as well as a command stream.
JMODEMRichard B. Johnson?XMODEM derivative with blocks from 512 to 8192 bytes and RLE compression.
HS/LinkSamuel H. Smith1991
KermitFrank da Cruz et al.1981Open Source (BSD) as of 2011Transport- and platform-independent transfer of text and binary files across full- or half-duplex connections with conversion of text file formats and character sets.[104]
LeechModemSam Brown?Variations of X and Y that faked failed downloads in order to avoid BBS download quotas.
LynxMatthew Thomas1989Similar to Kermit: 64-byte packets, 2 to 16 packets per window, CRC-32. Little or no support outside the Lynx program itself.
NMODEML. B. Neal1990Essentially XMODEM-CRC with 2048 byte blocks.
OBEX File Transfer Protocol??A synchronous file transfer protocol in the OBject EXchange (OBEX) Bluetooth profile.
OBEX Push??An asynchronous file transfer protocol in the OBject EXchange (OBEX) Bluetooth profile.[105]
PunterSteve Punter?Suite of similar-but-different XMODEM-like protocols for various Commodore machines.
SEAlinkThom Henderson1986A MODEM7/XMODEM-compatible protocol with sliding window support developed to avoid propagation delays in satellite transmissions and packet networks.[106][107][108]
SMODEMArisoft?
TmodemMike Bryeans?
UUCPMike Lesk1979Suite of protocols for copying files between Unix machines, used for many purposes including the distribution of email. Also allows commands to be sent, which led to the first internet worms. The file transfer protocol within UUCP is the "g" protocol.[109]
MODEM7Mark M. Zeigler, James K. Mills1980Slight extension of XMODEM to add filename support and batch transfers.[110]
XMODEMWard Christensen1977Public domainVery simple protocol that saw widespread use and provided the pattern for many following protocols.[111]
WXMODEMPeter Boswell1986Public domainVersion of XMODEM with sliding windows for higher performance.[112][113]
YMODEMChuck Forsberg1985Public domainSeries of optional expansions on XMODEM for higher performance.[112]
ZMaxMike Bryeansc. 1991Modifications to ZMODEM to allow packets up to 32 kB in length.
ZMODEMChuck Forsberg1986Public domainStreaming protocol that forsakes XMODEM compatibility but offers a wide variety of new features and improved performance. Became almost universal on BBS systems in the early 1990s.[112]

Features
ProtocolData block size
(bytes)		Data
compression		Error detectionTransfer
resuming		BidirectionalSliding windowRefs
BiModemYes
BLASTCRCYesYes
C-MODEM32–4096CRCYes
B protocol128–2048CRC32 / CRC16 / 8-bit checksumYesYes
JMODEM64–8192RLE
HS/LinkCRC32YesYes
Kermit≤9024 (negotiated)RLE (run length encoding, negotiated)Checksum or CRC16 (negotiated)Yes (binary files only, negotiated)NoOver full-duplex only (negotiated)[114]
LeechModem
LynxRLECRC32Yes
NMODEM2048
OBject EXchange
Punter
SEAlinkYesYes
SMODEMYes
TmodemNo
UUCP "g"≤4096NoNo[115][116]
MODEM7128NoChecksumStop-and-wait ARQ
XMODEM128NoChecksumStop-and-wait ARQ
WXMODEM≤512Yes
YMODEM1024NoCRC16
ZMax≤~32,768CRC32
ZMODEM256 / 1024NoCRC32YesYes

See also

Notes
  1. Cohen, Bram (2 July 2001). "The BitTorrent Protocol Specification". Yahoo! Finance Groups. Archived from the original on 16 December 2008. Retrieved 23 February 2018.
  2. Shoch, John (1979). EFTP: A PUP-based Ether File Transfer Protocol.
  3. Snodgrass, Richard (December 1982). A Relational Approach to Monitoring Complex Systems. pp. 119, 149. Retrieved 3 March 2018.
  4. United States patent 20090063698, Ying Xu, Michelle Christine Munson, Serban Simu, "Method and system for aggregate bandwith control [sic]", issued 30 May 2017, assigned to Aspera, Inc. and IBM
  5. Paila, Toni; Luby, Michael; Lehtonen, Rami; Roca, Vincent; Walsh, Rod (October 2004). FLUTE - File Delivery over Unidirectional Transport. IETF. doi:10.17487/RFC3926. RFC 3926. Retrieved 7 March 2018.
  6. Petersen, Julie K., ed. (2002). "File Service Protocol". The Telecommunications Illustrated Dictionary (2nd ed.). CRC Press. p. 357. ISBN 978-1-4200-4067-8 – via Google Books.
  7. "File Service Protocol (FSP) Frequently Asked Questions [Part 2/2]". FAQs.org. 21 July 1995. Section: "Who writes and maintains FSP software?". Retrieved 3 March 2018.
  8. Bhushan, Abhay (April 1971). A File Transfer Protocol. IETF. doi:10.17487/RFC0114. RFC 114. Retrieved 24 February 2018.
  9. Horowitz, M.; Lunt, S. (October 1997). FTP Security Extensions. IETF. doi:10.17487/RFC2228. RFC 2228. Retrieved 3 March 2018.
  10. Ford-Hutchinson, Paul (October 2005). Securing FTP with TLS. IETF. doi:10.17487/RFC4217. RFC 4217. Retrieved 3 March 2018.
  11. Sliwa, Carol (31 May 1999). "Secure Sockets Layer". Computerworld. p. 69. Retrieved 1 March 2018 – via Google Books.
  12. Hickman, Kipp E. B. (April 1995). The SSL Protocol. IETF. I-D draft-hickman-netscape-ssl-00. Retrieved 1 March 2018.
  13. Berners-Lee, Tim. "The Original HTTP as defined in 1991". W3.org. Retrieved 3 March 2018.
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  15. Norberg, Arvid (22 June 2009). "uTorrent transport protocol". BitTorrent.org. Retrieved 10 March 2018.
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  17. United States patent 7710961, C. Kenneth Miller, Thomas Andresen, Thomas Gardner, Craig Michelson, Kenneth Cates, Marc White, Kary Robertson, "System and method for sending packets over a computer network", issued 20 December 2011, assigned to Darby and Mohaine LLC
  18. Nash, David (September 1997). ODETTE File Transfer Protocol. IETF. doi:10.17487/RFC2204. RFC 2204. Retrieved 22 February 2018.
  19. Friend, Ieuan (November 2007). ODETTE File Transfer Protocol 2. IETF. doi:10.17487/RFC5024. RFC 5024. Retrieved 22 February 2018.
  20. He, Eric; Leigh, Jason; Yu, Oliver; DeFanti, Thomas A. (September 2002). "Reliable Blast UDP: Predictable High Performance Bulk Data Transfer" (PDF). Proceedings: IEEE International Conference on Cluster Computing, ICCC (January 2002). IEEE Cluster Computing 2002. Chicago. pp. 317–24. ISSN 1552-5244. OCLC 5942572037. Retrieved 2 March 2018.
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  27. Ylönen, Tatu (30 September 2012). "Re: where are SFTP v0 - 2 defined?". secsh (Mailing list). Retrieved 9 March 2018. I designed and implemented the original SFTP protocol for SSH 2.0 back around 1997. Sami Lehtinen did further development on it.
    It was originally a proprietary protocol at SSH Communications Security (www.ssh.com), though source code was publicly available. It took a while [sic] before we wrote the draft and brought it to the IETF for standardization (seems to have been January 2001).
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  42. Pott, Trevor (1 October 2015). "Aspera high speed file transfer: Let the cloud protocol wars begin". The Register. Retrieved 18 February 2018.
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  45. Paila, Toni; Walsh, Rod; Luby, Michael; Roca, Vincent; Lehtonen, Rami (November 2012). FLUTE - File Delivery over Unidirectional Transport. IETF. doi:10.17487/RFC3926. RFC 3926. Retrieved 7 March 2018.
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  70. Friend, Ieuan (November 2007). ODETTE File Transfer Protocol 2. IETF. doi:10.17487/RFC5024. RFC 5024. Retrieved 22 February 2018.
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References

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