A Brief Explanation of TCP/IP Ports

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A Brief Explanation of TCP/IP Ports

There are many standardized ports in computer systems, which are dedicated to various tasks. TCP/IP ports are used in data transfer from one computer to another, mainly for Internet services. This article provides an explanation regarding different types of these ports.

Data transfer between computers requires certain set of rules. TCP/IP protocol suite is a collection of commands that are used for the Internet services. TCP and IP were the two protocols that were standardized at first, and after this, the standardization of the other protocols was started. Internet is a huge connection of computers and network devices, and all of them have an IP address. This address has a number of TCP ports that initiate and receive connections. The receiver ports are more important than the initiating ones.


The following table will briefly tell you everything about these ports:

Ports Service Name Description
0 Reserved Reserved
1 TCP MUX TCP Port Service Multiplexer
7 Echo Echo
21 FTP File Transfer Protocol is used to send large files.
22 SSH Secure Shell
23 Telnet Telnet is a network protocol and uses the command line interface on the remote computer. It is an interactive session based on protocol and uses a connection based protocol.
25 SMTP Simple Mail Transfer Protocol uses commands for interaction and can send large files from one device to another.
38 RAP Route Access Protocol
41 Graphics Graphics
44 MPM-flags MPM FLAGS Protocol
45 MPM Message Processing Module
49 TACACS Local Host Protocol (TACACS)
50 Re-Mail-Ck Remote Mail Checking Protocol
52 XNS Xerox Network Systems
53 Domain Domain Name Server uses UPD for interaction and TCP for relatively large files.
57 MTP Mail Transfer Protocol
67 (only UDP) BOOTPS Bootstrap Protocol Server
68 (only UDP) BOOTPC Bootstrap Protocol Client
69 TFTP Trivial File Transfer Protocol
80 HTTP World Wide Web HTTP (Hypertext transfer Protocol) is a TCP based messaging protocol.
93 (only TCP) DCP Device Control Protocol
109 (only TCP) POP2 Post Office Protocol 2
110 (only TCP) POP3 Post Office Protocol 3
143 IMAP Internet Message Access Protocol
153 SGMP Simple Gateway Monitoring Protocol
161 (only TCP) SNMP Simple Network Management Protocol
179 (only TCP) BGP Border Gateway Protocol
389 LDAP Lightweight Directory Access Protocol
427 SLP Service Location Protocol
444 SNPP Simple Network Paging Protocol
631 IPP Internet Printing Protocol

The transport layer of the Internet protocol suite uses the TCP and UDP. In addition, some of the other protocols use numerical identifiers for the host-to-host communication. These identifiers are known as port numbers, and these endpoints are known as ports. The port numbers are assigned by IANA (Internet Assigned Numbers Authority), and on most of the systems, they are used as processes (programs) only. These ports are named by logical connections, and are connected to carry long-term conversations. A port number is always assigned to the receiver endpoint so that the transmitter endpoint must know the port number (in turn, the receiver endpoint), to which the connection should be made to start the conversation. Initially, when this concept came into existence, there were only 0-255 ports. Later, 0-1023 ports were introduced, and the range was expanded.

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