List of TCP and UDP port numbers. This is a list of Internet socketport numbers used by protocols of the transport layer of the Internet Protocol Suite for the establishment of host- to- host connectivity. Originally, port numbers were used by the Network Control Program (NCP) in the ARPANET for which two ports were required for half- duplex transmission. Later, the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full- duplex, bidirectional traffic.
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The even- numbered ports were not used, and this resulted in some even numbers in the well- known port number range being unassigned. The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.[1] However, many unofficial uses of both well- known and registered port numbers occur in practice. Table legend[edit] Official: Port is registered with IANA for the application.[1] Unofficial: Port is not registered with IANA for the application. Multiple use: Multiple applications are known to use this port. Well- known ports[edit]The port numbers in the range from 0 to 1.
They are used by system processes that provide widely used types of network services. On Unix- like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well- known ports. Port. TCPUDPDescription. Status. 0N/AN/AIn programming APIs (not in communication between hosts), requests a system- allocated (dynamic) port[3][4]N/A0. UDPReserved. Official. TCPUDPTCP Port Service Multiplexer (TCPMUX)Official.
TCPUDPCompress. NET[5] Management Utility[6]Official. TCPUDPCompress. NET[5] Compression Process[7]Official.
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TCPUDPUnassigned. Official. 5TCPUDPRemote job entry. Official. 6TCPUDPUnassigned. Official. 7TCPUDPEcho Protocol. Official. 8TCPUDPUnassigned.
Official. 9TCPUDPDiscard Protocol. Official. 9UDPWake- on- LANUnofficial.
TCPUDPUnassigned. Official. 11. TCPUDPActive Users (systat service)[8][9]Official. TCPUDPUnassigned. Official. 13. TCPUDPDaytime Protocol (RFC 8.
Official. 14. TCPUDPUnassigned. Official. 15. TCPUDPPreviously netstat service[8]Unofficial. TCPUDPUnassigned.
Official. 17. TCPUDPQuote Of The Day. Official. 18. TCPUDPMessage Send Protocol. Unofficial. 20. TCPUDPFTP data transfer. Official. 21. UDPFTP control (command)Official. UDPSecure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding.
Official. 23. TCPUDPTelnet protocol—unencrypted text communications. Official. 24. TCPUDPPriv- mail, any private mail system. Official. 25. TCPUDPSimple Mail Transfer Protocol (SMTP), used for e- mail routing between mail servers. Official. 26. TCPUDPUnassigned. Official. 27. TCPUDPNSW User System FEOfficial. TCPUDPMSG ICPOfficial.
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TCPUDPDisplay Support Protocol. Official. 35. TCPUDPAny private printer server protocol. Official. 37. TCPUDPTime Protocol. Official. 39. TCPUDPResource Location Protocol[1. RLP)—used for determining the location of higher level services from hosts on a network.
Official. 40. TCPUDPUnassigned. Official. 42. TCPUDPARPA Host Name Server Protocol. Official. 42. TCPUDPWindows Internet Name Service. Unofficial. 43. TCPUDPWHOIS protocol.
Official. 47. TCPUDPNI FTPOfficial. TCPUDPTACACS+ Login Host protocol. Official. 50. TCPUDPESP[1. Official. 51. TCPUDPIMP Logical Address Maintenance. Official. 52. TCPUDPXNS (Xerox Network Systems) Time Protocol.
Official. 53. TCPUDPDomain Name System (DNS)Official. TCPUDPXerox Network Systems (XNS) clearinghouse. Official. 55. TCPUDPISI Graphics Language (ISI- GL)Official. TCPUDPXerox Network Systems (XNS) authentication. Official. 56. TCPUDPRoute Access Protocol (RAP)[1. Unofficial. 57. TCPUDPAny private terminal access.
Official. 58. TCPUDPXerox Network Systems (XNS) Mail. Official. 64. TCPUDPCI (Travelport) (formerly Covia) Comms Integrator.
Official. 67. TCPUDPBootstrap Protocol (BOOTP) server; also used by Dynamic Host Configuration Protocol (DHCP)Official. TCPUDPBootstrap Protocol (BOOTP) client; also used by Dynamic Host Configuration Protocol (DHCP)Official. TCPUDPTrivial File Transfer Protocol (TFTP)Official.
TCPUDPGopher protocol. Official. 71–7. TCPUDPNETRJS protocol. Official. 77. TCPUDPAny private Remote job entry. Official. 79. TCPUDPFinger protocol. Official. 80. UDPHypertext Transfer Protocol (HTTP)[1. Official. 80. UDPQUIC (from Chromium) for HTTPUnofficial.
TCPTorparkonion routing. Unofficial. 82. UDPTorpark control.
Unofficial. 88. TCPUDPKerberos authentication system. Official. 90. TCPUDPdnsix (Do.
D Network Security for Information Exchange) Security Attribute Token Map. Official. 90. TCPUDPPoint. Cast (dotcom)Unofficial. TCPWIP Message protocol.
Unofficial. 10. 0UDPCyber. Gate RAT protocol. Unofficial. 10. 1TCPUDPNIChost name. Official. 10. 2TCPUDPISO Transport Service Access Point (TSAP) Class 0 protocol; [1.
Digital Equipment Corporation. DECnet (Phase V+) over TCP/IPOfficial. TCPUDPACR/NEMADigital Imaging and Communications in Medicine (DICOM)Official.
TCPUDPCCSO Nameserver Protocol (Qi/Ph)Official. TCPUDPRemote Telnet Service[1. Official. 10. 8TCPUDPSNA Gateway Access Server[1]Official.
TCPUDPPost Office Protocol v. POP2)Official. 11. TCPUDPPost Office Protocol v.
POP3)Official. 11. TCPUDPONC RPC (Sun. RPC)Official. 11.
TCPIdent, authentication service/identification protocol,[1. IRC servers to identify users. Official. 11. 3UDPAuthentication Service[1. Official. 11. 5TCPSimple File Transfer Protocol.
Official. 11. 7STDUUCPPath Service. Official. 11. 8TCPUDPStructured Query Language (SQL) Services. Official. 11. 9TCPNetwork News Transfer Protocol (NNTP), retrieval of newsgroup messages. Official. 12. 3TCPUDPNetwork Time Protocol (NTP), used for time synchronization. Official. 12. 6TCPUDPFormerly Unisys Unitary Login, renamed by Unisys to NXEdit. Used by Unisys Programmer's Workbench for Clearpath MCP, an IDE for Unisys MCP software development.
Official. 13. 5TCPUDPDCEendpoint resolution. Official. 13. 5TCPUDPMicrosoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[1. DHCP server, DNS server and WINS. Also used by DCOMUnofficial.
TCPUDPNet. BIOS Name Service. Official. 13. 8TCPUDPNet. BIOS Datagram Service. Official. 13. 9TCPUDPNet. BIOS Session Service. Official. 14. 3TCPInternet Message Access Protocol (IMAP), management of email messages.
Official. 15. 2TCPUDPBackground File Transfer Program (BFTP)[1. Official. 15. 3TCPUDPSimple Gateway Monitoring Protocol (SGMP)Official. TCPUDPSQL Service.
Official. 15. 8TCPUDPDistributed Mail Service Protocol (DMSP)[1. Unofficial. 16. 1UDPSimple Network Management Protocol (SNMP)Official. TCPUDPSimple Network Management Protocol Trap (SNMPTRAP)[2. Official. 17. 0TCPPrint- srv, Network Post.
Script. Official. TCPVMNET (IBM z/VM, z/OS & z/VSE—Network Job Entry (NJE))Official. TCPUDPX Display Manager Control Protocol (XDMCP)Official. TCPBorder Gateway Protocol (BGP)Official. TCPUDPInternet Relay Chat (IRC)Official. TCPUDPSMUX, SNMP Unix Multiplexer. Official. 20. 1TCPUDPApple.
Talk Routing Maintenance. Official. 20. 9TCPUDPQuick Mail Transfer Protocol.
Official. 21. 0TCPUDPANSIZ3. Official. 21. 3TCPUDPInternetwork Packet Exchange (IPX)Official. TCPUDPMessage posting protocol (MPP)Official.
TCPUDPInternet Message Access Protocol (IMAP), version 3. Official. 25. 9TCPUDPEfficient Short Remote Operations (ESRO)Official.
TCPUDPArcisdms. Official. TCPUDPBorder Gateway Multicast Protocol (BGMP)Official. TCPUDPhttp- mgmt. Official. 30. 0TCPThin. Linc Web Access. Unofficial.
TCPNovastor Online Backup. Official. 31. 1TCPMac OS X Server Admin (officially Apple.
Share IP Web administration)Official. TCPUDPPKIX Time Stamp Protocol (TSP)Official. UDPPrecision Time Protocol (PTP) event messages. Official. 32. 0UDPPrecision Time Protocol (PTP) general messages. Official. 35. 0TCPUDPMapping of Airline Traffic over Internet Protocol (MATIP) type AOfficial.
TCPUDPMATIP type BOfficial. TCPUDPcloanto- net- 1 (used by Cloanto Amiga Explorer and VMs)Official. TCPUDPOn- Demand Mail Relay (ODMR)Official.
TCPUDPRpc. 2portmap. Official. 37. 0TCPcodaauth. Coda authentication server. Official. 37. 0UDPcodaauth.
Coda authentication server. Official. 37. 0UDPsecurecast.
NAI's Secure. Cast servers[2. As of 2. 00. 0[update]Unofficial.
TCPUDPClear. Case albd. Official. 38. 3TCPUDPHP data alarm manager. Official. 38. 4TCPUDPA Remote Network Server System. Official. 38. 7TCPUDPAURP (Apple. Talk Update- based Routing Protocol)[2. Official. 38. 9TCPUDPLightweight Directory Access Protocol (LDAP)Official. TCPUDPDigital Equipment Corporation.
DECnet (Phase V+) over TCP/IPOfficial. TCPUDPUninterruptible power supply (UPS)Official. TCPUDPService Location Protocol (SLP)Official. TCPUDPNNSP, part of Network News Transfer Protocol. Official. 43. 4TCPUDPMobile IP Agent (RFC 5.
Official. 44. 3UDPHypertext Transfer Protocol over TLS/SSL (HTTPS)Official. UDPQUIC (from Chromium) for HTTPSUnofficial. TCPUDPSimple Network Paging Protocol (SNPP), RFC 1. Official. 44. 5TCPMicrosoft- DS Active Directory, Windows shares. Official. 44. 5TCPMicrosoft- DS SMB file sharing.
Official. 46. 4TCPUDPKerberos Change/Set password. Official. 46. 5TCPURL Rendezvous Directory for SSM (Cisco protocol)Official. TCPSimple Mail Transfer Protocol over TLS/SSL (SMTPS)Unofficial. TCPUDPtcpnethaspsrv, Aladdin Knowledge Systems Hasp services. Official. 49. 1TCPGO- Global remote access and application publishing software.
Unofficial. 49. 7TCPDantz Retrospect. Official. 50. 0TCPUDPInternet Security Association and Key Management Protocol (ISAKMP) / Internet Key Exchange (IKE)Official. TCPUDPModbus Protocol. Official. 50. 4TCPUDPCitadel, multiservice protocol for dedicated clients for the Citadel groupware system. Official. 51. 0TCPUDPFirst. Class Protocol (FCP), used by First. Class client/server groupware system.