H I N D A L F A L A S I1 0 A G

20 COMMON PORTS AND THEIR PURPOSES

WHAT ARE PORTS?

• Most network protocols involve transferring data over one or more ports, which are numbered

resources on a computer.

• The port number identifies the protocol being used.

PORT 1

TCP Port Service Multiplexer

(TCPMUX)

PORT 5

Remote Job Entry (RJE) 

PORT 7

ECHO

PORT 18

Message Send Protocol(MSP)

PORT 20, 21Protocol Common Server

Program(s)Explanation

FTP oftpd,ProFTPD, Pure-FTPd, vsftpd

FTP is an old protocol for transferring files over a network. It

supports both anonymous and

password-mediated access.

PORT 22Protocol Common Server

Program(s)Explanation

SSH OpenSSH SSH is an encrypted remote access tool. It

also supports file transfers and

encrypting other protocols.

PORT 23Protocol Common Server

Program(s)Explanation

Telnet telnetd an old unencrypted remote login protocol, that can be a useful network diagnostic

tool.

PORT 25Protocol Common Server

Program(s)Explanation

SMTP Exim, Postfix, qmail, sendmail

SMTP is the main protocol for moving

email on the Internet.

PORT 42Protocol Common Server

Program(s)Explanation

DNS dnsmasq, named DNS enables computers to look up

an IP address by providing a

hostname, or vice-versa.

PORT 67Protocol Common Server

Program(s)Explanation

BOOTP, DHCP dnsmasq, dhcpd BOOTP and DHCP enable a computer on

a local network to help automatically

configure other computers to use a

network.

PORT 80Protocol Common Server

Program(s)Explanation

HTTP Apache (HTTP) is the basis of the World Wide Web

(WWW, or Web).

PORT 109, 110Protocol Common Server

Program(s)Explanation

POP2 and POP3 Courier, Cyrus, IMAP, Dovecot, UW IMAP

This protocol enables a recipient to initiate

an email transfer

PORT 118Protocol Common Server

Program(s)Explanation

SQL MySQL, PostgreSQL (SQL) is a network-enabled database

inter- face language.

PORT 137, 139Protocol Common Server

Program(s)Explanation

SMB/CIFS Samba Microsoft uses the (SMB)/ (CIFS)

protocols for file and printer sharing, and Samba implements these protocols in

Linux.

PORT 143, 200Protocol Common Server

Program(s)Explanation

IMAP Courier, Cyrus, IMAP, D

IMAP makes it easier for recipients to

permanently store and manage email on the server computer

PORT 389Protocol Common Server

Program(s)Explanation

LDAP OpenLDAP a network protocol for accessing directories, which in this context

are a type of database.

PORT 443Protocol Common Server

Program(s)Explanation

HTTPS Apache This protocol is a secure (encrypted)

variant of HTTP.

PORT 2049Protocol Common Server

Program(s)Explanation

NFS NFS (NFS) is a protocol, and a server of the same name, for file

sharing between Unix and Unix-like OSs.