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This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. 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. Similarly, many of the official assignments refer to protocols that were never or are no longer in common use. This article lists port numbers and their associated protocols that have experienced significant uptake.

Table legend

Legend of TCP and UDP protocol table cells for port numbers

Cell	Description
Yes	Described protocol is assigned by IANA for this port, and is: standardized, specified, or widely used for such.
Unofficial	Described protocol is not assigned by IANA for this port, but is: standardized, specified, or widely used for such.
Assigned	Described protocol is assigned by IANA for this port,[2] but is not: standardized, specified, or widely used for such.
No	Described protocol is not: assigned by IANA for this port, standardized, specified, or widely used for such.
Reserved	Port is reserved by IANA,[2] generally to prevent collision having its previous use removed.[3][4] The port number may be available for assignment upon request to IANA.[3]

Well-known ports

The port numbers in the range from 0 to 1023 (0 to 2¹⁰ − 1) are the well-known ports or system ports.^[3] 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.^[5]

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Well-known ports

Port	TCP	UDP	SCTP	DCCP	Description
0	Reserved				In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port[6]
1	Yes	Assigned			TCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been assigned to TCPMUX by IANA,[2] but by design only TCP is specified.[7]
2	Assigned				compressnet (Management Utility)[3]
3	Assigned				compressnet (Compression Process)[3]
5	Assigned				Remote Job Entry[8] was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5[9] and IANA has assigned both TCP and UDP 5 to it.
7	Yes				Echo Protocol[10][11]
9	Yes		Yes[12]	Assigned	Discard Protocol[13]
	No	Unofficial			Wake-on-LAN[14]
11	Yes				Active Users (systat service)[15][16]
13	Yes				Daytime Protocol[17]
15	Unofficial	No			Previously netstat service[2][15]
17	Yes				Quote of the Day (QOTD)[18]
18	Yes				Message Send Protocol[19][20]
19	Yes				Character Generator Protocol (CHARGEN)[21]
20	Yes	Assigned	Yes[12]		File Transfer Protocol (FTP) data transfer[11]
21	Yes	Assigned	Yes[12]		File Transfer Protocol (FTP) control (command)[11][12][22][23]
22	Yes	Assigned	Yes[12]		Secure Shell (SSH),[11] secure logins, file transfers (scp, sftp) and port forwarding
23	Yes	Assigned			Telnet protocol—unencrypted text communications[11][24]
25	Yes	Assigned			Simple Mail Transfer Protocol (SMTP),[11][25] used for email routing between mail servers
27	Assigned				nsw-fe (NSW User System FE)[3]
28	Unofficial				Palo Alto Networks' Panorama High Availability (HA) sync encrypted port.[26]
29	Assigned				msg-icp (MSG ICP)[3]
31	Assigned				msg-auth (MSG Authentication)[3]
33	Assigned				dsp (Display Support Protocol)[3]
37	Yes				Time Protocol[27]
38	Assigned				rap (Route Access Protocol)[3]
39	Assigned				rlp (Resource Location Protocol)[3]
41	Assigned				graphics (Graphics)[3]
42	Assigned	Yes			Host Name Server Protocol[28]
43	Yes	Assigned			WHOIS protocol[29][30][31]
44	Assigned				mpm-flags (MPM FLAGS Protocol)[3]
45	Assigned				mpm (Message Processing Module )[3]
46	Assigned				mpm-snd (MPM )[3]
47	Reserved
48	Assigned				auditd (Digital Audit Daemon)[3]
49	Yes				TACACS Login Host protocol.[32] TACACS+, still in draft which is an improved but distinct version of TACACS, only uses TCP 49.[33]
50	Assigned				re-mail-ck (Remote Mail Checking Protocol)[3]
51	Reserved				Historically used for Interface Message Processor logical address management,[34] entry has been removed by IANA on 2013-05-25
52	Assigned				Xerox Network Systems (XNS) Time Protocol. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[35]
53	Yes				Domain Name System (DNS)[36][11]
54	Assigned				Xerox Network Systems (XNS) Clearinghouse (Name Server). Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[35]
55	Assigned				isi-gl (ISI Graphics Language)[3]
56	Assigned				Xerox Network Systems (XNS) Authentication Protocol. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[35]
58	Assigned				Xerox Network Systems (XNS) Mail. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[35]
61	Reserved				Historically assigned to the NIFTP-Based Mail protocol,[37] but was never documented in the related IEN.[38] The port number entry was removed from IANA's registry on 2017-05-18.[2]
62	Assigned				acas (ACA Services)[3]
63	Assigned				whoispp (whois++)[3]
64	Assigned				covia (Communications Integrator (CI))[3]
65	Assigned				tacacs-ds (TACACS-Database Service)[3]
66	Assigned				sql-net (Oracle SQL*NET)[3]
67	Assigned	Yes			Bootstrap Protocol (BOOTP) server;[11] also used by Dynamic Host Configuration Protocol (DHCP)
68	Assigned	Yes			Bootstrap Protocol (BOOTP) client;[11] also used by Dynamic Host Configuration Protocol (DHCP)
69	Assigned	Yes			Trivial File Transfer Protocol (TFTP)[11][39][40][41]
70	Yes	Assigned			Gopher protocol[42]
71–74	Yes				NETRJS protocol[43][44][45]
76	Assigned				deos (Distributed External Object Store)[3]
78	Assigned				vettcp (vettcp)[3]
79	Yes	Assigned			Finger protocol[11][46][47]
80	Yes		Yes[12]		Hypertext Transfer Protocol (HTTP)[48][49] uses TCP in versions 1.x and 2. HTTP/3 uses QUIC,[50] a transport protocol on top of UDP.
81	Unofficial				TorPark onion routing[verification needed]
82	Assigned				xfer (XFER Utility)[3]
82		Unofficial			TorPark control[verification needed]
83	Assigned				mit-ml-dev (MIT ML Device)[3]
84	Assigned				ctf (Common Trace Facility)[3]
85	Assigned				mit-ml-dev (MIT ML Device)[3]
86	Assigned				mfcobol (Micro Focus Cobol)[3]
88	Yes				Kerberos[11][51][52] authentication system
89	Assigned				su-mit-tg (SU/MIT Telnet Gateway)[3]
90	Assigned				dnsix (DNSIX Security Attribute Token Map)[3]
90	Unofficial				PointCast (dotcom)[2]
91	Assigned				mit-dov (MIT Dover Spooler)[3]
92	Assigned				npp (Network Printing Protocol)[3]
93	Assigned				dcp (Device Control Protocol)[3]
94	Assigned				objcall (Tivoli Object Dispatcher)[3]
95	Yes	Assigned			SUPDUP, terminal-independent remote login[53]
96	Assigned				dixie (DIXIE Protocol Specification)[3]
97	Assigned				swift-rvf (Swift Remote Virtual File Protocol)[3]
98	Assigned				tacnews (TAC News)[3]
99	Assigned				metagram (Metagram Relay)[3]
101	Yes	Assigned			NIC host name[54]
102	Yes	Assigned			ISO Transport Service Access Point (TSAP) Class 0 protocol;[55][56]
104	Yes				Digital Imaging and Communications in Medicine (DICOM; also port 11112)
105	Yes				CCSO Nameserver[57]
106	Unofficial	No			macOS Server, (macOS) password server[11]
107	Yes