Ports and their purposes

1. 20 Common Ports and their
Purposes
Maryam Al Ghaith
10AG

2. 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.

3. Port 1
TCP
Port Service Multiplexer
(TCPMUX)

4. Port 5
Remote Job Entry (RJE)

5. Port 7
ECHO

6. Port 18
Message Send Protocol
(MSP)

7. Port 20, 21
Protocol 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.

8. Port 22
Protocol Common Server
Program(s)
Explanation
SSH OpenSSH SSH is an encrypted
remote access tool. It
also supports file
transfers and
encrypting other
protocols.

9. Port 23
Protocol Common Server
Program(s)
Explanation
Telnet telnetd an old unencrypted
remote login protocol,
that can be a useful
network diagnostic
tool.

10. Port 25
Protocol Common Server
Program(s)
Explanation
SMTP Exim, Postfix, qmail,
sendmail
SMTP is the main
protocol for moving
email on the Internet.

11. Port 42
Protocol Common Server
Program(s)
Explanation
DNS dnsmasq, named DNS enables
computers to look up
an IP address by
providing a hostname,
or vice-versa.

12. Port 67
Protocol 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.

13. Port 80
Protocol Common Server
Program(s)
Explanation
HTTP Apache (HTTP) is the basis of
the World Wide Web
(WWW, or Web).

14. Port 109, 110
Protocol Common Server
Program(s)
Explanation
POP2 and POP3 Courier, Cyrus, IMAP,
Dovecot, UW IMAP
This protocol enables
a recipient to initiate
an email transfer

15. Port 118
Protocol Common Server
Program(s)
Explanation
SQL MySQL, PostgreSQL (SQL) is a network-
enabled database
inter- face language.

16. Port 137, 139
Protocol 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.

17. Port 143, 200
Protocol 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

18. Port 389
Protocol Common Server
Program(s)
Explanation
LDAP OpenLDAP a network protocol for
accessing directories,
which in this context
are a type of
database.

19. Port 443
Protocol Common Server
Program(s)
Explanation
HTTPS Apache This protocol is a
secure (encrypted)
variant of HTTP.

20. Port 2049
Protocol 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.