Transport Layer Port (TCP/IP and UDP Ports)

Transport Layer port or ports are application or process specific software built which are used to serve as communication endpoint between the operating system's of host computers. The main purpose of these ports is to identify uniquely different processes and applications which are running on a computer and enable them to share one physical connection of a packet switched network such as internet. In the them of Internet Protocol each ports is linked with IP address of the host and the protocol which is used for communication.

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The protocols which basically use ports are transport layer protocols like TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) which belongs to suit of Internet Protocol. For each address and protocol port is identified by a number which consists of 16 bits and also known as port number. To complete the destination address for communication session port number is added to the ip address of computer.

Ports are categorized into three types

• Official
• Unofficial
• Multiple Use

Official Transport Layer Port

Ports which are registered by IANA for the application are known as official ports.

Unofficial Transport Layer Port

Ports which are not registered by IANA for the application are known as unofficial ports.

Multiple Use Transport Layer Port

A single ports which is used by multiple application is known as multiple ports.

Ports

Number of ports ranges from 0 to 1023. In the below table there are some port number,  port type (TCP or UDP), port description and status (Official or Unofficial) of port is mentioned.

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Port Number	TCP	UDP	Description	Status
0	TCP		Programming Technique for specific system allocation ports	Unofficial
0		UDP	Reserved	Official
1	TCP	UDP	TCPMUX (TCP port service multiplexer	Official
2	TCP	UDP	CompressNET Management Utility	Official
3	TCP	UDP	CompressNET Compression Process	Official
4	TCP	UDP	Unassigned	Official
5	TCP	UDP	Remote Job Entry	Official
6	TCP	UDP	Unassigned	Official
7	TCP	UDP	Echo Protocol	Official
8	TCP	UDP	Unassigned	Official
9	TCP	UDP	Discard Port	Official
9		UDP	Wake on LAN	Unofficial
10	TCP	UDP	Unassigned	Official
11	TCP	UDP	Active User (Systat Service)	Official
12	TCP	UDP	Unassigned	Official
13	TCP	UDP	Day time protocol (RFC 867)	Official
14	TCP	UDP	Unassigned	Official
15	TCP	UDP	Previously Netstat Service	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 Hpst (SSH)	Official
23	TCP	UDP	Telnet Protocol	Official
24	TCP	UDP	Pri mail	Official
25	TCP		Simple Mail Transfer Protocol (SMTP)	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 Protocl (RLP)	Official
40	TCP	UDP	Unassigned	Official
42	TCP	UDP	ARPA Host name server protocol	Official
42	TCP	UDP	Window internet name service	unofficial
43	TCP		WHOIS protocol	Official
47	TCP	UDP	NI FTP	Official
49	TCP	UDP	TACACS Login Host Protocol	Official
50	TCP	UDP	Remote mail checking protocol	Official
51	TCP	UDP	IMP logical address maintenance	Official
53	TCP	UDP	Domain Name Server (DNS)	Official
69		UDP	Trivial File Transfer Protocol (TFTP)	Official
80	TCP		Hpyertext Transfer Protocol (HTTP)	Official
443	TCP		Hpyertext Transfer Protocol Secure (HTTPS)	Official
465	TCP		Simple Mail Transfer Protocol Secure (SMTPS)	Unofficial
520		UDP	Routing Information Protocol (RIP)	Official
521		UDP	Routing Information Protocol Next Generation (RIPng)	Official
546	TCP	UDP	DHCPv6 Client	Official
547	TCP	UDP	DHCPv6 Server	Official

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