Common Ports

1TCP Port Service Multiplexer (TCPMUX)

The specification describes a multiplexing service that may be accessed with a network protocol to contact any one of a number of available TCP services of a host on a single

5 Remote Job Entry (RJE)

Remote job entry is the procedure for sending requests for data processing tasks or 'jobs' to mainframe computers from remote workstations

7 ECHO

 It was originally proposed for testing and measurement of round-trip times in IP networks.

Message send protocol 18

is an application layer protocol used to send a short message between nodes on a network.

20 FTP -- Data

The FTP protocol uses a pair of connections between the FTP client and FTP server .

21FTP -- Control

TP servers open their machine's port 21 and listen for incoming client connections.

22 SSH Remote Login Protocol

 is a cryptographic (encrypted) network protocol to allow remote login and other network services to operate securely over an unsecured network.

23 Telnet

 this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23

25 Simple Mail Transfer Protocol (SMTP)

Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission

29 MSG ICP

TCP ports use the Transmission Control Protocol .

UDP ports use the Datagram Protocol, a communications protocol for the Internet network

37 Time

A host connects to a server that supports the Time Protocol on port 37. The server then sends the time as a 32-bit unsigned integer in binary format 

42Host Name Server (Name server)

 is an obsolete network protocol used in translating a host name to an Internet address.

43 WhoIs

is a query and response protocol that is widely used for querying databases that store the registered users

49 Login Host Protocol (Login)

uses the Transmission Control Protocol. TCP is one of the main protocols in TCP/IP networks .

Flagged as a virus

53 Domain Name System (DNS)

is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network.

69 Trivial File Transfer Protocol (TFTP)

Trivial File Transfer Protocol (TFTP) is a simple, lock-step, File Transfer Protocol which allows a client to get from or put a file onto a remote host.

70 Gopher Services

 is a TCP/IP application layer protocol designed for distributing, searching..

79 Finger

exchange of human-oriented status and user information.

80 HTTP

 is an application protocol for distributed, collaborative, hypermedia information systems

103 X.400 Standard

X.400 is the messaging standard specified by the ITU-TS Union

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