List of TCP and UDP port numbers

Port

TCP

UDP

Description

Status

0

TCP

 

Programming technique for specifying system-allocated (dynamic) ports[3]

Unofficial

0

 

UDP

Reserved

Official

1

TCP

UDP

TCP Port Service Multiplexer (TCPMUX)

Official

2

TCP

UDP

CompressNET[4] Management Utility[5]

Official

3

TCP

UDP

CompressNET[4] Compression Process[6]

Official

4

TCP

UDP

Unassigned

Official

5

TCP

UDP

Remote Job Entry

Official

6

TCP

UDP

Unassigned

Official

7

TCP

UDP

Echo Protocol/ Ping/ ICMP

Official

8

TCP

UDP

Unassigned

Official

9

TCP

UDP

Discard Protocol

Official

9

 

UDP

Wake-on-LAN

Unofficial

10

TCP

UDP

Unassigned

Official

11

TCP

UDP

Active Users (systat service)[7][8]

Official

12

TCP

UDP

Unassigned

Official

13

TCP

UDP

Daytime Protocol (RFC 867)

Official

14

TCP

UDP

Unassigned

Official

15

TCP

UDP

Previously netstat service[7]

Unofficial

16

TCP

UDP

Unassigned

Official

17

TCP

UDP

Quote of the Day

Official

18

TCP

UDP

Message Send Protocol

Official

19

TCP

UDP

Character Generator Protocol (CHARGEN)

Official

20

TCP

UDP

FTP data transfer

Official

21

TCP

 

FTP control (command)

Official

22

TCP

UDP

Secure Shell (SSH)—used for secure logins, file transfers (scp, sftp) and port forwarding

Official

23

TCP

UDP

Telnet protocol—unencrypted text communications

Official

24

TCP

UDP

Priv-mail : any private mail system.

Official

25

TCP

 

Simple Mail Transfer Protocol (SMTP)—used for e-mail routing between mail servers

Official

26

TCP

UDP

encrypted SMTP

Official

27

TCP

UDP

NSW User System FE

Official

29

TCP

UDP

MSG ICP

Official

33

TCP

UDP

Display Support Protocol

Official

35

TCP

UDP

Any private printer server protocol

Official

37

TCP

UDP

TIME protocol

Official

39

TCP

UDP

Resource Location Protocol[9] (RLP)—used for determining the location of higher levelservices from hosts on a network

Official

40

TCP

UDP

Unassigned

Official

42

TCP

UDP

ARPA Host Name Server Protocol

Official

42

TCP

UDP

Windows Internet Name Service

Unofficial

43

TCP

 

WHOIS protocol

Official

47

TCP

UDP

NI FTP[9]

Official

49

TCP

UDP

TACACS Login Host protocol

Official

50

TCP

UDP

Remote Mail Checking Protocol[10]

Official

51

TCP

UDP

IMP Logical Address Maintenance

Official

52

TCP

UDP

XNS (Xerox Network Systems) Time Protocol

Official

53

TCP

UDP

Domain Name System (DNS)

Official

54

TCP

UDP

XNS (Xerox Network Systems) Clearinghouse

Official

55

TCP

UDP

ISI Graphics Language (ISI-GL)

Official

56

TCP

UDP

XNS (Xerox Network Systems) Authentication

Official

56

TCP

UDP

Route Access Protocol (RAP)[11]

Unofficial

57

TCP

 

Mail Transfer Protocol (RFC 780)

Official

58

TCP

UDP

XNS (Xerox Network Systems) Mail

Official

64

TCP

UDP

CI (Travelport) (formerly Covia) Comms Integrator

Official

67

 

UDP

Bootstrap Protocol (BOOTP) Server; also used by Dynamic Host Configuration Protocol(DHCP)

Official

68

 

UDP

Bootstrap Protocol (BOOTP) Client; also used by Dynamic Host Configuration Protocol(DHCP)

Official

69

 

UDP

Trivial File Transfer Protocol (TFTP)

Official

70

TCP

 

Gopher protocol

Official

71

TCP

 

NETRJS protocol

Official

72

TCP

 

NETRJS protocol

Official

73

TCP

 

NETRJS protocol

Official

74

TCP

 

NETRJS protocol

Official

77

TCP

UDP

Any private Remote Job Entry

Official

79

TCP

 

Finger protocol

Official

80

TCP

 

Hypertext Transfer Protocol (HTTP)[12]

Official

80

 

UDP

QUIC (from Chromium) for HTTP

Unofficial

81

TCP

 

Torpark—Onion routing

Unofficial

82

 

UDP

Torpark—Control

Unofficial

88

TCP

UDP

Kerberos—authentication system

Official

90

TCP

UDP

dnsix (DoD Network Security for Information Exchange) Securit Attribute Token Map

Official

90

TCP

UDP

PointCast (dotcom)

Unofficial

99

TCP

 

WIP Message protocol

Unofficial

100

 

UDP

CyberGate RAT protocol

Unofficial

101

TCP

 

NIC host name

Official

102

TCP

 

ISO-TSAP (Transport Service Access Point) Class 0 protocol;[13] also used by Digital Equipment Corporation DECnet (Phase V+) over TCP/IP

Official

104

TCP

UDP

ACR/NEMA Digital Imaging and Communications in Medicine (DICOM)

Official

105

TCP

UDP

CCSO Nameserver Protocol (Qi/Ph)

Official

107

TCP

 

Remote TELNET Service[14] protocol

Official

108

TCP

UDP

SNA Gateway Access Server[1]

Official

109

TCP

 

Post Office Protocol v2 (POP2)

Official

110

TCP

 

Post Office Protocol v3 (POP3)

Official

111

TCP

UDP

ONC RPC (Sun RPC)

Official

113

TCP

 

Ident—Authentication Service/Identification Protocol,[15] used by IRC servers to identify users

Official

113

 

UDP

Authentication Service[15] (auth)

Official

115

TCP

 

Simple File Transfer Protocol (SFTP)

Official

117

STD

 

UUCP Path Service

Official

118

TCP

UDP

SQL (Structured Query Language) Services

Official

119

TCP

 

Network News Transfer Protocol (NNTP)—retrieval of newsgroup messages

Official

123

 

UDP

Network Time Protocol (NTP)—used for time synchronization

Official

126

TCP

UDP

Formerly 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

135

TCP

UDP

DCE endpoint resolution

Official

135

TCP

UDP

Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[16]used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM

Unofficial

137

TCP

UDP

NetBIOS NetBIOS Name Service

Official

138

TCP

UDP

NetBIOS NetBIOS Datagram Service

Official

139

TCP

UDP

NetBIOS NetBIOS Session Service

Official

143

TCP

 

Internet Message Access Protocol (IMAP)—management of email messages

Official

152

TCP

UDP

Background File Transfer Program (BFTP)[17]

Official

153

TCP

UDP

SGMP, Simple Gateway Monitoring Protocol

Official

156

TCP

UDP

SQL Service

Official

158

TCP

UDP

DMSP, Distributed Mail Service Protocol[18]

Unofficial

161

 

UDP

Simple Network Management Protocol (SNMP)

Official

162

TCP

UDP

Simple Network Management Protocol Trap (SNMPTRAP)[19]

Official

170

TCP

 

Print-srv, Network PostScript

Official

175

TCP

 

VMNET (IBM z/VM, z/OS & z/VSE—Network Job Entry (NJE))

Official

177

TCP

UDP

X Display Manager Control Protocol (XDMCP)

Official

179

TCP

 

BGP (Border Gateway Protocol)

Official

194

TCP

UDP

Internet Relay Chat (IRC)

Official

199

TCP

UDP

SMUX, SNMP Unix Multiplexer

Official

201

TCP

UDP

AppleTalk Routing Maintenance

Official

209

TCP

UDP

The Quick Mail Transfer Protocol

Official

210

TCP

UDP

ANSI Z39.50

Official

213

TCP

UDP

Internetwork Packet Exchange (IPX)

Official

218

TCP

UDP

Message posting protocol (MPP)

Official

220

TCP

UDP

Internet Message Access Protocol (IMAP), version 3

Official

259

TCP

UDP

ESRO, Efficient Short Remote Operations

Official

264

TCP

UDP

BGMP, Border Gateway Multicast Protocol

Official

280

TCP

UDP

http-mgmt

Official

300

TCP

 

ThinLinc Web Access

Unofficial

308

TCP

 

Novastor Online Backup

Official

311

TCP

 

Mac OS X Server Admin (officially AppleShare IP Web administration)

Official

318

TCP

UDP

PKIX TSP, Time Stamp Protocol

Official

319

 

UDP

Precision Time Protocol event messages

Official

320

 

UDP

Precision Time Protocol general messages

Official

350

TCP

UDP

MATIP-Type A, Mapping of Airline Traffic over Internet Protocol

Official

351

TCP

UDP

MATIP-Type B, Mapping of Airline Traffic over Internet Protocol

Official

366

TCP

UDP

ODMR, On-Demand Mail Relay

Official

369

TCP

UDP

Rpc2portmap

Official

370

TCP

 

codaauth2—Coda authentication server

Official

370

 

UDP

codaauth2—Coda authentication server

Official

370

 

UDP

securecast1—Outgoing packets to NAI's SecureCast servers[20]As of 2000

Unofficial

371

TCP

UDP

ClearCase albd

Official

383

TCP

UDP

HP data alarm manager

Official

384

TCP

UDP

A Remote Network Server System

Official

387

TCP

UDP

AURP, AppleTalk Update-based Routing Protocol[21]

Official

389

TCP

UDP

Lightweight Directory Access Protocol (LDAP)

Official

399

TCP

UDP

Digital Equipment Corporation DECnet (Phase V+) over TCP/IP

Official

401

TCP

UDP

UPS Uninterruptible Power Supply

Official

427

TCP

UDP

Service Location Protocol (SLP)

Official

433

TCP

UDP

NNSP, part of Network News Transfer Protocol

Official

443

TCP

 

Hypertext Transfer Protocol over TLS/SSL (HTTPS)

Official

443

 

UDP

QUIC (from Chromium) for HTTPS

Unofficial

444

TCP

UDP

SNPP, Simple Network Paging Protocol (RFC 1568)

Official

445

TCP

 

Microsoft-DS Active Directory, Windows shares

Official

445

TCP

 

Microsoft-DS SMB file sharing

Official

464

TCP

UDP

Kerberos Change/Set password

Official

465

TCP

 

URL Rendezvous Directory for SSM (Cisco protocol)

Official

465

TCP

 

Simple Mail Transfer Protocol over TLS/SSL (SMTPS)

Unofficial

475

TCP

UDP

tcpnethaspsrv (Aladdin Knowledge Systems Hasp services, TCP/IP version)

Official

491

TCP

 

GO-Global remote access and application publishing software

Unofficial

497

TCP

 

Dantz Retrospect

Official

500

TCP

UDP

Internet Security Association and Key Management Protocol (ISAKMP)

Official

502

TCP

UDP

Modbus, Protocol

Official

504

TCP

UDP

Citadel—multiservice protocol for dedicated clients for the Citadel groupware system

Official

512

TCP

 

Rexec, Remote Process Execution

Official

512

 

UDP

comsat, together with biff

Official

513

TCP

 

rlogin

Official

513

 

UDP

Who[22]

Official

514

TCP

 

Shell—used to execute non-interactive commands on a remote system (Remote Shell, rsh, remsh)

Official

514

 

UDP

Syslog—used for system logging

Official

515

TCP

 

Line Printer Daemon—print service

Official

517

 

UDP

Talk

Official

518

 

UDP

NTalk

Official

520

TCP

 

efs, extended file name server

Official

520

 

UDP

Routing Information Protocol (RIP)

Official

521

 

UDP

Routing Information Protocol Next Generation (RIPng)

Official

524

TCP

UDP

NetWare Core Protocol (NCP) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc.

Official

525

 

UDP

Timed, Timeserver

Official

530

TCP

UDP

RPC

Official

531

TCP

UDP

AOL Instant Messenger

Unofficial

532

TCP

 

netnews

Official

533

 

UDP

netwall, For Emergency Broadcasts

Official

540

TCP

 

UUCP (Unix-to-Unix Copy Protocol)

Official

542

TCP

UDP

commerce (Commerce Applications)

Official

543

TCP

 

klogin, Kerberos login

Official

544

TCP

 

kshell, Kerberos Remote shell

Official

545

TCP

 

OSIsoft PI (VMS), OSISoft PI Server Client Access

Unofficial

546

TCP

UDP

DHCPv6 client

Official

547

TCP

UDP

DHCPv6 server

Official

548

TCP

 

Apple Filing Protocol (AFP) over TCP

Official

550

TCP

UDP

new-rwho, new-who[22]

Official

554

TCP

UDP

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