internet assigned numbers authority port list

Internet Assigned Numbers Authority (IANA)

The IANA assigns a lot of different numbers (and the like) related to network protocols. Widely known are the well known TCP / UDP port assignments (see PortReference ), such as the assignment of TCP port 80 as the standard port for HTTP traffic. In addition to this, the IANA has made a number of other assignments:

Protocol numbers for protocols running on top of IP

Media types used in HTTP , SIP , e-mail, WSP , MMSE and many other protocols

The assigned numbers (including the port numbers) were once reported using RFC documents. Several of such obsoleted RFCs exists (1700, 1340, 1060, 1010, 990, 960, 943, 923, 900, 870, 820, 790, 776, 770, 762, 758,755, 750, 739, 604, 503, 433, 349). Today, the IANA keeps "living documents" of assigned numbers on their webpage.

External Links

RFC1700 : Last RFC containing assigned numbers (obsoleted by IANA list).

RFC3232 : States that RFC1700 is obsoleted by the IANA list.

IANA list of assigned numbers : Official lists of assigned numbers and the like.

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1.9 Standards Assignments

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This protocol uses standard Internet Assigned Numbers Authority (IANA) port assignments for HTTP and Secure Sockets Layer (SSL) . These standard port assignments use IANA-assigned ports, as listed in the following table.

Additional resources

Port Number Lookup

If you are not sure that Port Numbers you are going to use has been assignned for what purpose. You can lookup our TCP ports database and find details related to assignment Port or Protocol assigned by IANA (Internet Assigned Numbers Authority).

Port Numbers and Protocols

TCP and UDP are two different protocols that are used for transmitting data over a network. TCP (Transmission Control Protocol) is a connection-oriented protocol that ensures that data is delivered reliably and in the correct order. UDP (User Datagram Protocol) is a connectionless protocol that does not guarantee the delivery of data or the order in which it is delivered.

Here are some common port numbers that are used by TCP and UDP:

TCP port numbers:

• Port 80: HTTP (Hypertext Transfer Protocol)
• Port 443: HTTPS (HTTP Secure)
• Port 21: FTP (File Transfer Protocol)
• Port 22: SSH (Secure Shell)
• Port 25: SMTP (Simple Mail Transfer Protocol)
• Port 155: NETSC

UDP port numbers:

• Port : DNS (Domain Name System)
• Port 67: DHCP (Dynamic Host Configuration Protocol)
• Port 69: TFTP (Trivial File Transfer Protocol)
• Port 123: NTP (Network Time Protocol)

Note that these are just a few examples, and there are many other port numbers that are used for various purposes.

For port numbers lookup, the official database of ports and protocols from IANA (Internet Assigned Numbers Authority) is used. IANA is an organization that manages Internet protocol parameters, as well as IP address spaces and top-level domains.

Diffrent Port Number Ranges?

The entire range of port numbers (from 0 to 65535) is divided into three categories.

0 - 1023  Well-Known Ports The  numbers are reserved by IANA for system processes or network programs with administrative rights. Ports from this category should not be used without registering with IANA.

1024 - 49151  Registered Ports  Ports registered for use by conventional programs and application layer protocols. This category of ports is most popular for commercial software. Registration is also required to use any port.

49152 - 65535  Dynamic ports  Designed for free but temporary use. Registration of ports in this category is not possible.

Our Port checker tool allows you to test open ports in your system. You can easily verify if any port is opened or not not by typing your IP address or domain name and desired port number.

This topic lists the well-known port assignments for transport protocols TCP and UDP, and includes port number, keyword, and a description of the reserved port assignment. You can also find a list of these well-known port numbers in the hlq .ETC.SERVICES data set. The official assignment of port numbers is managed by the Internet Assigned Numbers Authority. The current list can be viewed at http://www.iana.org/assignments/port-numbers .

Table 1 lists the well-known port assignments for TCP.

• Well-known UDP port assignments

How Does Internet Work

Tcp and udp port numbers – complete list.

This is a list of Internet socket port numbers used by application communication with TCP and UDP on the Transport Layer of the Internet Protocol Suite for the host-to-host communications.

Let’s see who makes it possible? The Internet Assigned Numbers Authority (IANA) assigns all port numbers except Dynamic or Private ports. IANA is a standards organization in the world that is responsible for assigning various addressing standards.

There are different types of port numbers: Well Known Ports (Numbers 0 to 1023), Registered Ports (Numbers 1024 to 49151) and Dynamic or Private Ports (Numbers 49152 to 65535). The last porn number type  Dynamic or Private Ports  will not appear on our list because they are cannot be registered with IANA. This range is used for custom or temporary purposes and for automatic allocation of ephemeral ports. They are usually assigned dynamically to client applications when initiating a connection. It is not very common for a client to connect to a service using a Dynamic or Private Port, sometimes some peer-to-peer file sharing programs do.

We will introduce the list of the ports with short description of different port types.

Using both TCP and UDP is also normal sometime. Some applications may use both TCP and UDP. For example, the low overhead of UDP with his short header enables DNS to serve many client requests very quickly. However, sending the requested information sometimes may require the reliability of TCP. In that case, the port number of 53 that is a well known port number is used by both protocols with this service.

Let’s see the list of port numbers:

• Well-known ports
• Registered Ports

Well Known Ports (Numbers 0 to 1023) – These numbers are reserved for services and applications. They are commonly used for applications such as HTTP (web server) POP3/SMTP (e-mail server) and Telnet. By defining these well-known ports for server applications, client applications can be programmed to request a connection to that specific port and its associated service.

Registered Ports >> Registered Ports

Registered Ports (Numbers 1024 to 49151) – These port numbers are assigned to user processes or applications. These processes are primarily individual applications that a user has chosen to install rather than common applications that would receive a Well Known Port. When not used for a server resource, these ports may also be used dynamically selected by a client as its source port.

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• Network Ports

In computer networking, there are network port numbers used for various applications. The range of these network ports are from 0 to 65535 . There are three different port types used networking. These network port types are given below:

• Well-known Ports
• Registered Ports
• Dynamic Ports

Some of these port numbers are well-known ports. These well-known ports are the reserved ports between 0 and 1024 . The full list of these network port numbers are given in RFC 1700. IANA (Internet Assigned Numbers Authority) assigns these well-known ports.

The other network   ports are registered ports between 1024 and 49151 . These portsa re assigned by IANA for specific services.

The last part of ports in networking are dynamic ports. Daynamic ports are the ports from 49152 to 65565 . These ports in networking are not registered with IANA.

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) uses these well-known ports. Only one port is required for full-duplex, bidirectional traffic. Beside SCTP (Stream Control Transmission Protocol) and DCCP (Datagram Congestion Control Protocol) use these ports.

You can download the Cheat Sheet about Well-known network ports.

Table of Contents

Well Known Ports in Networking

Well-known network ports are from 0 to 1024 . These port numbers are given by IANA (Internet Assigned Numbers Authority) . And the full list of these port numbers are in RFC 1700.

Some of these  well-known ports are used by TCP and some of them are used UDP. These TCP and USP ports are also asked in many network engineering technical interviews as interview questions . So, what are these ports in networking?

Well-known TCP ports are the network ports used by the applications that works with TCP as transport protocol. So, what are these applications that uses well-known TCP ports ?

For example, FTP (File Transport Protocol) is one of the applications that uses TCP ports. The FTP ports are TCP port 20 and TCP port 21 . The other applcation that uses TCP as transport protocol is Telnet. Telnet uses TCP port 23 .

Well-known UDP ports are the network ports used by the applications that works with UDP as transport protocol. So, what are these applications that uses well-known UDP ports ?

For example TFTP (Trivial File Transport Protocol) is one of the applciations that uses UDP ports. UDP port 69 is used by TFTP. Another example that uses UDP as transport protocol is SNMP. SNMP uses UDP port 161 for SNMP and UDP port 162 for SNMP trap messages.

Below, you can find all the wellknown ports used by the applications that uses TCP & UDP network ports .

Registered Network Ports

Registered networking ports start from port 1024 to 49151. IANA (Internet Assigned Numbers Authority)  assigns these registerd network ports. Below, you can find these registered networking ports

Dynamic Networking Ports

Registered networking ports are the ports from 49152 to 65565.  These ports can be used locally or dynamically by the applications. They are not assigned by IANA.

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7 Securing Ports

The Internet Assigned Numbers Authority (IANA) administrates the port numbers in the range of 0 - 65,535.

When it comes to assigning port numbers for services that are not registered, only port numbers of the so-called dynamic (private) range of 49,152 - 65,535 should be assigned in order to meet minimum security requirements. However, conflicts with already installed applications can occur.

But in practice, numbers in the range from 0-1,023 are protected, and numbers from 1,024 onwards can be used. For example, operating systems must only allow processes with appropriate privileges to open the server ports that are within the given range.

Prior to any installation, contact your system administrator to evaluate the ports that are already in use by the system and applications. Conflicts can be avoided by assigning ports that are already used by Agile e6. An existing firewall can also be configured, accordingly.

In case a system administrator is not available, a list of currently used TCP- and UDP -ports can be created with the command netstat -a. The RPC ports that are available through PortMapper can be determined using the command rpcinfo -p.

7.1 Range of Ports

The port numbers are divided into three ranges:

Well-known ports

The well known ports are those from 0 - 1,023. DCCP well known ports should not be used without IANA registration. The registration procedure is defined in document RFC4340, section 19.9.

Registered ports

The registered ports are those from 1,024 - 49,151. DCCP registered ports should not be used without IANA registration. The registration procedure is defined in document RFC4340, section 19.9.

Dynamic and/or private ports

The dynamic and/or private ports are those from 49,152 - 65,535.

7.1.1 Well Known Port Numbers

The well known ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users.

Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port".

To the extent possible, the same port assignments are used with the UDP [RFC768]. The range for assigned ports managed by the IANA is 0-1,023.

7.1.2 Registered Port Numbers

The registered ports are listed by the IANA and on most systems can be used by ordinary user processes, or programs executed by ordinary users.

Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port.

The IANA registers uses of these ports as a convenience to the community. To the extent possible, these same port assignments are used with the UDP [RFC768]. The Registered Ports are in the range 1,024-49,151.

7.1.3 Dynamic and/or Private Ports

The Dynamic and/or Private Ports are those from 49,152 - 65,535.

7.2 Range of Values and Dependencies