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Top 1000 Well Known Ports
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
Port
TCP
UDP
IANA status
Description
SCTP
0
Reserved
Reserved
Official
N/A
N/A
Unofficial
In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port
1
Yes
Assigned
Official
TCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been assigned to TCPMUX by IANA, but by design only TCP is specified.
5
Assigned
Assigned
Official
Remote Job Entry was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5 and IANA has assigned both TCP and UDP 5 to it.
7
Yes
Yes
Official
9
Yes
Yes
Official
Yes
No
Yes
Unofficial
11
Yes
Yes
Official
Active Users (systat service)
13
Yes
Yes
Official
15
Yes
No
Unofficial
Previously netstat servic
17
Yes
Yes
Official
18
Yes
Yes
Official
19
Yes
Yes
Official
20
Yes
Assigned
Official
File Transfer Protocol (FTP) data transfer
Yes
21
Yes
Assigned
Official
File Transfer Protocol (FTP) control (command)
Yes
22
Yes
Assigned
Official
Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding
Yes
23
Yes
Assigned
Official
Telnet protocol—unencrypted text communications
25
Yes
Assigned
Official
Simple Mail Transfer Protocol (SMTP), used for email routing between mail servers
37
Yes
Yes
Official
42
Assigned
Yes
Official
43
Yes
Assigned
Official
WHOIS protocol
47
Reserved
Reserved
Official
49
Yes
Yes
Official
TACACS Login Host protocol. TACACS+, still in draft which is an improved but distinct version of TACACS, only uses TCP 49.
51
Reserved
Reserved
Official
Historically used for Interface Message Processor logical address management, entry has been removed by IANA on 2013-05-25
52
Assigned
Assigned
Official
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.
53
Yes
Yes
Official
54
Assigned
Assigned
Official
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.
56
Assigned
Assigned
Official
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.
58
Assigned
Assigned
Official
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.
61
Reserved
Reserved
Official
Historically assigned to the NIFTP-Based Mail protocol, but was never documented in the related IEN. The port number entry was removed from IANA's registry on 2017-05-18.
67
Assigned
Yes
Official
Bootstrap Protocol (BOOTP) server; also used by Dynamic Host Configuration Protocol (DHCP)
68
Assigned
Yes
Official
Bootstrap Protocol (BOOTP) client; also used by Dynamic Host Configuration Protocol (DHCP)
69
Assigned
Yes
Official
70
Yes
Assigned
Official
Gopher protocol
71–74
Yes
Yes
Official
NETRJS protocol
79
Yes
Assigned
Official
80
Yes
Assigned
Official
Yes
No
Yes
Unofficial
QUIC, a transport protocol over UDP (still in draft as of April 2020), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2. QUIC has been renamed to HTTP/3, which is currently an Internet Draft.
82
Yes
Unofficial
TorPark control
83
Yes
Assigned
Official
MIT ML Device, networking file system
88
Yes
Assigned
Official
Kerberos authentication system
90
Yes
Yes
Unofficial
95
Yes
Assigned
Official
SUPDUP, terminal-independent remote login
101
Yes
Assigned
Official
102
Yes
Assigned
Official
ISO Transport Service Access Point (TSAP) Class 0 protocol
104
Yes
Yes
Official
105
Yes
Yes
Official
107
Yes
Yes
Official
108
Yes
Yes
Official
IBM Systems Network Architecture (SNA) gateway access server
109
Yes
Assigned
Official
Post Office Protocol, version 2 (POP2)
110
Yes
Assigned
Official
Post Office Protocol, version 3 (POP3)
111
Yes
Yes
Official
Open Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC)
113
Yes
No
Official
Ident, authentication service/identification protocol, used by IRC servers to identify users
Yes
Assigned
Official
Authentication Service (auth), the predecessor to identification protocol. Used to determine a user's identity of a particular TCP connection.
115
Yes
Assigned
Official
117
Yes
Yes
Official
UUCP Mapping Project (path service)
118
Yes
Yes
Official
Structured Query Language (SQL) Services
119
Yes
Assigned
Official
Network News Transfer Protocol (NNTP), retrieval of newsgroup messages
123
Assigned
Yes
Official
Network Time Protocol (NTP), used for time synchronization
126
Yes
Yes
Official
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
135
Yes
Yes
Official
DCE endpoint resolution
Yes
Yes
Official
Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[67] used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM
137
Yes
Yes
Official
NetBIOS Name Service, used for name registration and resolution
138
Assigned
Yes
Official
NetBIOS Datagram Service
139
Yes
Assigned
Official
NetBIOS Session Service
143
Yes
Assigned
Official
Internet Message Access Protocol (IMAP),management of electronic mail messages on a server
152
Yes
Yes
Official
153
Yes
Yes
Official
Simple Gateway Monitoring Protocol (SGMP), a protocol for remote inspection and alteration of gateway management information
156
Yes
Yes
Official
Structured Query Language (SQL) Service
158
Yes
Yes
Official
Distributed Mail System Protocol (DMSP, sometimes referred to as Pcmail)
161
Assigned
Yes
Official
162
Yes
Yes
Official
170
Yes
Yes
Official
177
Yes
Yes
Official
X Display Manager Control Protocol (XDMCP), used for remote logins to an X Display Manager server
179
Yes
Assigned
Official
Border Gateway Protocol (BGP),[77] used to exchange routing and reachability information among autonomous systems (AS) on the Internet
Yes
194
Yes
Yes
Official
199
Yes
Yes
Official
SNMP Unix Multiplexer (SMUX)
201
Yes
Yes
Official
AppleTalk Routing Maintenance
209
Yes
Assigned
Official
210
Yes
Yes
Official
ANSI Z39.50
213
Yes
Yes
Official
218
Yes
Yes
Official
Message posting protocol (MPP)
220
Yes
Yes
Official
225–241
Reserved
Reserved
Official
249–255
Reserved
Reserved
Official
259
Yes
Yes
Official
Efficient Short Remote Operations (ESRO)
262
Yes
Yes
Official
Arcisdms
264
Yes
Yes
Official
280
Yes
Yes
Official
http-mgmt
300
Yes
Unofficial
ThinLinc Web Access
308
Yes
Official
Novastor Online Backup
311
Yes
Assigned
Official
Mac OS X Server Admin (officially AppleShare IP Web administration)
318
Yes
Yes
Official
319
Yes
Official
Precision Time Protocol (PTP) event messages
320
Yes
Official
Precision Time Protocol (PTP) general messages
350
Yes
Yes
Official
351
Yes
Yes
Official
MATIP type B
356
Yes
Yes
Official
cloanto-net-1 (used by Cloanto Amiga Explorer and VMs)
366
Yes
Yes
Official
On-Demand Mail Relay (ODMR)
369
Yes
Yes
Official
Rpc2portmap
370
Yes
Yes
Official
codaauth2, Coda authentication server
Yes
Official
securecast1, outgoing packets to NAI's SecureCast servers. As of 2000
371
Yes
Yes
Official
ClearCase albd
383
Yes
Yes
Official
HP data alarm manager
384
Yes
Yes
Official
A Remote Network Server System
387
Yes
Yes
Official
AURP (AppleTalk Update-based Routing Protocol)
388
Yes
Assigned
Official
Unidata LDM near real-time data distribution protocol
389
Yes
Assigned
Official
399
Yes
Yes
Official
Digital Equipment Corporation DECnet+ (Phase V) over TCP/IP (RFC1859)
401
Yes
Yes
Official
427
Yes
Yes
Official
433
Yes
Yes
Official
434
Yes
Yes
Official
Mobile IP Agent (RFC 5944)
443
Yes
Assigned
Official
Yes
No
Yes
Unofficial
Quick UDP Internet Connections (QUIC), a transport protocol over UDP (still in draft as of July 2018), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2.
444
Yes
Yes
Official
445
Yes
Yes
Official
Microsoft-DS (Directory Services) Active Directory, Windows shares
Yes
Assigned
Official
Microsoft-DS (Directory Services) SMB file sharing
464
Yes
Yes
Official
Kerberos Change/Set password
465
Yes
No
Official
URL Rendezvous Directory for SSM (Cisco protocol)[importance?]
Yes
No
Official
Authenticated SMTP over TLS/SSL (SMTPS)
475
Yes
Yes
Official
tcpnethaspsrv, Aladdin Knowledge Systems Hasp services
497
Yes
Yes
Official
502
Yes
Yes
Official
Modbus Protocol
504
Yes
Yes
Official
Citadel, multiservice protocol for dedicated clients for the Citadel groupware system
510
Yes
Yes
Official
FirstClass Protocol (FCP), used by FirstClass client/server groupware system
512
Yes
Official
Rexec, Remote Process Execution
Yes
Official
comsat, together with biff
513
Yes
Official
rlogin
Yes
Official
Who
514
Yes
Unofficial
Remote Shell, used to execute non-interactive commands on a remote system (Remote Shell, rsh, remsh)
No
Yes
Official
Syslog, used for system logging
515
Yes
Assigned
Official
Line Printer Daemon (LPD),[10] print service
517
Yes
Official
Talk
518
Yes
Official
NTalk
520
Yes
Official
efs, extended file name server
Yes
Official
521
Yes
Official
524
Yes
Yes
Official
NetWare Core Protocol (NCP) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc.
525
Yes
Official
Timed, Timeserver
530
Yes
Yes
Official
532
Yes
Assigned
Official
netnews
533
Yes
Official
netwall, For Emergency Broadcasts
540
Yes
Official
Unix-to-Unix Copy Protocol (UUCP)
542
Yes
Yes
Official
commerce (Commerce Applications)
543
Yes
Official
klogin, Kerberos login
544
Yes
Official
kshell, Kerberos Remote shell
546
Yes
Yes
Official
DHCPv6 client
547
Yes
Yes
Official
DHCPv6 server
548
Yes
Assigned
Official
Apple Filing Protocol (AFP) over TCP
550
Yes
Yes
Official
new-rwho, new-who
554
Yes
Yes
Official
556
Yes
Official
Remotefs, RFS, rfs_server
560
Yes
Official
rmonitor, Remote Monitor
561
Yes
Official
monitor
563
Yes
Yes
Official
NNTP over TLS/SSL (NNTPS)
564
Yes
Unofficial
9P (Plan 9)
585
Port 993
?
Unofficial
Legacy use of Internet Message Access Protocol over TLS/SSL (IMAPS), now in use at port 993.
587
Yes
Assigned
Official
591
Yes
Official
FileMaker 6.0 (and later) Web Sharing (HTTP Alternate, also see port 80)
593
Yes
Yes
Official
601
Yes
Official
Reliable Syslog Service — used for system logging
604
Yes
Official
TUNNEL profile, a protocol for BEEP peers to form an application layer tunnel
623
Yes
Official
ASF Remote Management and Control Protocol (ASF-RMCP) & IPMI Remote Management Protocol
625
Yes
No
Unofficial
Open Directory Proxy (ODProxy)
631
Yes
Yes
Official
Yes
Yes
Unofficial
Common Unix Printing System (CUPS) administration console (extension to IPP)
635
Yes
Yes
Official
RLZ DBase
636
Yes
Assigned
Official
639
Yes
Yes
Official
641
Yes
Yes
Official
SupportSoft Nexus Remote Command (control/listening), a proxy gateway connecting remote control traffic
643
Yes
Yes
Official
SANity
646
Yes
Yes
Official
Label Distribution Protocol (LDP), a routing protocol used in MPLS networks
647
Yes
Official
DHCP Failover protocol
648
Yes
Official
Registry Registrar Protocol (RRP)
651
Yes
Yes
Official
IEEE-MMS
653
Yes
Yes
Official
SupportSoft Nexus Remote Command (data), a proxy gateway connecting remote control traffic
654
Yes
Official
Media Management System (MMS) Media Management Protocol (MMP)
655
Yes
Yes
Official
Tinc VPN daemon
657
Yes
Yes
Official
IBM RMC (Remote monitoring and Control) protocol, used by System p5 AIX Integrated Virtualization Manager (IVM) and Hardware Management Console to connect managed logical partitions (LPAR) to enable dynamic partition reconfiguration
660
Yes
Assigned
Official
Mac OS X Server administration, version 10.4 and earlier
666
Yes
Yes
Official
Doom, first online first-person shooter
Yes
Unofficial
airserv-ng, aircrack-ng's server for remote-controlling wireless devices
674
Yes
Official
688
Yes
Yes
Official
REALM-RUSD (ApplianceWare Server Appliance Management Protocol)
690
Yes
Yes
Official
Velneo Application Transfer Protocol (VATP)
691
Yes
Official
MS Exchange Routing
694