A preassigned address within a server that provides a direct route from the application to the Transport layer or from the Transport layer to the application of a TCP/IP system.
The address of an individual application on a particular host. Port numbers below 1024 are reserved for predefined applications, for example FTP servers (always) listen on port 21.
Computers that run the TCP/IP protocols can use different ports to run different services
A number identifying a certain Internet application. For example, the default port number for the Gopher service is 70, and for the WWW service it is 80.
a logical number that manages the category of service supported and resources used in the TCP/UDP protocol
an example of an identifier
a number designating a channel of communication that is dedicated for use of one particular transmission protocol
a number that specifies a process or program that sends and receives packets in a computer connected to the Internet
a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server
Number carried in internet transport protocols to identify which service or program is supposed to receive an incoming packet. Certain port numbers are permanently assigned to particular protocols by the IANA. For example, e-mail generally uses port 25 and Web services traditionally use port 80.
Besides the IP of the server itself, any given function of the server would also have an associated port number specifying which port to connect to. HTTP connections are made through port 80, smtp through port 25, and each other type of service has it's own port number.
A number assigned to an application to communicate with a server: allows the server to communicate with a number of different applications. An HTTP web server typically uses port 80; an application server port 8080 and an FTP server port 20.
This is an address of an individual program running on a UNIX computer. Port numbers are used because UNIX computers can run many programs users might connect to (such as FTP or Telnet). Port numbers are standardized, and in most cases are not required. Some system administrators change these standards to increase security. In those instances, you will need to provide the port number of the application you want to connect to.
Programs, known as “applications”, running on a computer are identified by port numbers - World wide web traffic is usually sent to “port 80” for instance. If your computer has external connections (to the Internet, for example), all ports that you don't actually need should be locked by a firewall as they can be used to allow intruders to access your computer.
If you see an address like 66.33.209.103:10200 or haxial.com:500, then the port number is the number after the colon ':'. So in those examples, the port numbers are 10200 and 500 respectively. Port numbers are generally used to distinguish between the different services/programs that may be running on a computer. You can think of this like a block of apartments/units which all have the same street address, so in order to distinguish between the different apartments, you write an address like: Apartment 5, 12 Main Street.
In the Internet suite of protocols, the identifier for a logical connector between an application entity and the transport service.
Some Internet services have a unique number assigned to them which refers to a logical channel in a communications system. Using a port number with a Telnet session, such as telnet madlab.sprl.umich.edu 3000, allows for a connection without providing a login name.
The slot number on the RIC Multiport/2 interface cable adapter that is connected to the Siemens 9751 CBX (Release 9005).
A number that directs data packets to a specific process on an Internet server. Many low port numbers are referred to as "well-known" port numbers, and they are permanently assigned to specific Internet activities. For example, HTTP data is reserved to port number 80 and SMTP email uses port number 25. There are 65,535 port numbers available for use with TCP and the same amount for UDP.
A logical communications channel to be used by a particular TCP/IP application. Each application has unique port numbers associated with it. By convention, some protocols use a well-known port number (for example, HTTP uses port 80), although this is configurable.
A number in the range 1 to 65,535 that identifies a port. The port number does not represent a physical port, such as the serial port to which a modem or a mouse might be attached; instead, it is more like a regional memory address.
Any Internet application communicates at a particular port number specific to the application. For example FTP, HTTP, Gopher and telnet are all assigned unique port numbers so that the computer knows what to do when contacted at a particular port. There are accepted standard numbers for these ports so that computers know which port to connect to for a particular service. For example, Gopher servers generally "talk" at port 70, while HTTP servers generally "talk" at port 80. These default values can be overridden in a URL.