| Port number |
Service name |
Transport protocol |
Description |
| 7 |
Echo |
TCP, UDP |
Echo service |
| 19 |
CHARGEN |
TCP, UDP |
Character Generator Protocol, has severe vulnerabilities and thus is rarely used nowadays |
| 20 |
FTP-data |
TCP, SCTP |
File Transfer Protocol data transfer |
| 21 |
FTP |
TCP, UDP, SCTP |
File Transfer Protocol command control |
| 22 |
SSH/SCP/SFTP |
TCP, UDP, SCTP |
Secure Shell, secure logins, file transfers (scp, sftp), and port forwarding |
| 23 |
Telnet |
TCP |
Telnet protocol, for unencrypted text communications |
| 25 |
SMTP |
TCP |
Simple Mail Transfer Protocol, used for email routing between mail servers |
| 42 |
WINS Replication |
TCP, UDP |
Microsoft Windows Internet Name Service, vulnerable to attacks on a local network |
| 43 |
WHOIS |
TCP, UDP |
Whois service, provides domain-level information |
| 49 |
TACACS |
UDP; can also use TCP but not necessarily on port 49 |
Terminal Access Controller Access-Control System, provides remote authentication and related services for network access |
| 53 |
DNS |
TCP, UDP |
Domain Name System name resolver |
| 67 |
DHCP/BOOTP |
UDP |
Dynamic Host Configuration Protocol and its predecessor Bootstrap Protocol Server; server port |
| 68 |
DHCP/BOOTP |
UDP |
Dynamic Host Configuration Protocol and its predecessor Bootstrap Protocol Server; client port |
| 69 |
TFTP |
UDP |
Trivial File Transfer Protocol |
| 70 |
Gopher |
TCP |
Gopher is a communication protocol for distributing, searching, and retrieving documents in Internet Protocol (IP) networks |
| 79 |
Finger |
TCP |
Name/Finger protocol and Finger user information protocol, for retrieving and manipulating user information |
| 80 |
HTTP |
TCP, UDP, SCTP |
Hypertext Transfer Protocol (HTTP) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP |
| 88 |
Kerberos |
TCP, UDP |
Network authentication system |
| 102 |
Microsoft Exchange ISO-TSAP |
TCP |
Microsoft Exchange ISO Transport Service Access Point (TSAP) Class 0 protocol |
| 110 |
POP3 |
TCP |
Post Office Protocol, version 3 (POP3) |
| 113 |
Ident |
TCP |
Identification Protocol, for identifying the user of a particular TCP connection |
| 119 |
NNTP (Usenet) |
TCP |
Network News Transfer Protocol |
| 123 |
NTP |
UDP |
Network Time Protocol |
| 135 |
Microsoft RPC EPMAP |
TCP, UDP |
Microsoft Remote Procedure Call (RPC) Endpoint Mapper (EPMAP) service, for remote system access and management |
| 137 |
NetBIOS-ns |
TCP, UDP |
NetBIOS Name Service, used for name registration and resolution |
| 138 |
NetBIOS-dgm |
TCP, UDP |
NetBIOS Datagram Service, used for providing access to shared resources |
| 139 |
NetBIOS-ssn |
TCP, UDP |
NetBIOS Session Service |
| 143 |
IMAP |
TCP, UDP |
Internet Message Access Protocol (IMAP), management of electronic mail messages on a server |
| 161 |
SNMP-agents (unencrypted) |
UDP |
Simple network management protocol; agents communicate on this port |
| 162 |
SNMP-trap (unencrypted) |
UDP |
Simple network management protocol; listens for asynchronous traps |
| 177 |
XDMCP |
UDP |
X Display Manager Control Protocol |
| 179 |
BGP |
TCP |
Border Gateway Protocol |
| 194 |
IRC |
UDP |
Internet Relay Chat |
| 201 |
AppleTalk |
TCP, UDP |
AppleTalk Routing Maintenance. Trojan horses and computer viruses have used UDP port 201. |
| 264 |
BGMP |
TCP, UDP |
Border Gateway Multicast Protocol |
| 318 |
TSP |
TCP, UDP |
Time Stamp Protocol |
| 381 |
HP Openview |
TCP, UDP |
HP performance data collector |
| 383 |
HP Openview |
TCP, UDP |
HP data alarm manager |
| 389 |
LDAP |
TCP, UDP |
Lightweight directory access protocol |
| 411 |
(Multiple uses) |
TCP, UDP |
Direct Connect Hub, Remote MT Protocol |
| 412 |
(Multiple uses) |
TCP, UDP |
Direct Connect Client-to-Client, Trap Convention Port |
| 427 |
SLP |
TCP |
Service Location Protocol |
| 443 |
HTTPS (HTTP over SSL) |
TCP, UDP, SCTP |
Hypertext Transfer Protocol Secure (HTTPS) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP. |
| 445 |
Microsoft DS SMB |
TCP, UDP |
Microsoft Directory Services: TCP for Active Directory, Windows shares; UDP for Server Message Block (SMB) file-sharing |
| 464 |
Kerberos |
TCP, UDP |
For password settings on Kerberos |
| 465 |
SMTP over TLS/SSL, SSM |
TCP |
Authenticated SMTP over TLS/SSL (SMTPS), URL Rendezvous Directory for Cisco’s Source Specific Multicast protocol (SSM) |
| 497 |
Dantz Retrospect |
TCP, UDP |
A software suite for backing up operating systems |
| 500 |
IPSec / ISAKMP / IKE |
UDP |
Internet Protocol Security / Internet Security Association and Key Management Protocol / Internet Key Exchange |
| 512 |
rexec |
TCP |
Remote Process Execution |
| 513 |
rlogin |
TCP |
The Unix program rlogin allows users to log in on another host using a network. |
| 514 |
syslog |
UDP |
Syslog Protocol, for collecting and organizing all of the log files sent from the various devices on a network |
| 515 |
LPD/LPR |
TCP |
Line Printer Daemon protocol, or Line Printer Remote protocol |
| 520 |
RIP |
UDP |
Routing Information Protocol, used to find the optimal path between source and destination networks |
| 521 |
RIPng (IPv6) |
UDP |
Routing Information Protocol next generation, the IPv6 compatible version of RIP |
| 540 |
UUCP |
TCP |
Unix-to-Unix Copy Protocol |
| 548 |
AFP |
TCP |
Apple Filing Protocol |
| 554 |
RTSP |
TCP, UDP |
Real Time Streaming Protocol |
| 546 |
DHCPv6 |
TCP, UDP |
Dynamic Host Configuration Protocol version 6. DHCPv6 Clients listen for DHCPv6 messages on UDP port 546. |
| 547 |
DHCPv6 |
TCP, UDP |
DHCPv6 Servers and DHCPv6 Relay Agents listen for DHCPv6 messages on UDP port 547. |
| 560 |
rmonitor |
UDP |
Remote Monitor |
| 563 |
NNTP over TLS/SSL |
TCP, UDP |
Network News Transfer Protocol with encryption and verification |
| 587 |
SMTP |
TCP |
For email message submission via SMTP |
| 591 |
FileMaker |
TCP |
FileMaker Web Companion, the web publishing technology available in FileMaker versions 4-6 |
| 593 |
Microsoft DCOM |
TCP, UDP |
Distributed Component Object Model (DCOM) |
| 596 |
SMSD |
TCP, UDP |
SysMan Station daemon |
| 631 |
IPP |
TCP |
Internet Printing Protocol |
| 636 |
LDAP over TLS/SSL |
TCP, UDP |
Lightweight Directory Access Protocol over TLS/SSL |
| 639 |
MSDP (PIM) |
TCP |
Multicast Source Discovery Protocol, which is part of the Protocol Independent Multicast (PIM) family |
| 646 |
LDP (MPLS) |
TCP, UDP |
Label Distribution Protocol, applies to routers capable of Multiprotocol Label Switching (MPLS) |
| 691 |
Microsoft Exchange |
TCP |
Microsoft Exchange Routing |
| 860 |
iSCSI |
TCP |
Internet Small Computer Systems Interface |
| 873 |
rsync |
TCP |
The rsync file synchronization protocol efficiently transfers and synchronizes files between devices and networked computers. |
| 902 |
VMware Server |
TCP, UDP |
VMware ESXi, a hypervisor |
| 989 |
FTPS |
TCP |
File Transfer Protocol (data) over TLS/SSL |
| 990 |
FTPS |
TCP |
File Transfer Protocol (control) over TLS/SSL |
| 993 |
IMAP over SSL (IMAPS) |
TCP |
Internet Message Access Protocol over TLS/SSL |
| 995 |
POP3 over SSL (POP3S) |
TCP, UDP |
Post Office Protocol 3 over TLS/SSL |
| 3389 |
Microsoft RDP |
TCP, UDP |
Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft Corporation which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software |
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