Important Port number | Some Useful Default Ports by Linuxtopic

Some Important Ports Number 

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Important Port Number list 

1 . To see the  list of all port

vi /etc/services

2 . To see the used port of  of the services, for example we want to display mysql port

grep -i  < Service name > /etc/servicesgrep -i mysql /etc/services

mysql                3306/tcp                        # MySQL
mysql                3306/udp                       # MySQL
mysql-cluster    1186/tcp                        # MySQL Cluster Manager
mysql-cluster    1186/udp                       # MySQL Cluster Manager
mysql-cm-agent  1862/tcp                      # MySQL Cluster Manager Agent
mysql-cm-agent  1862/udp                    # MySQL Cluster Manager Agent
mysql-im          2273/tcp                        # MySQL Instance Manager
mysql-im          2273/udp                       # MySQL Instance Manager
mysql-proxy     6446/tcp                        # MySQL Proxy
mysql-proxy     6446/udp                       # MySQL Proxy
sphinxql            9306/tcp                        # Sphinx search server (MySQL listener)

Some Important Port Number  and full form 

Port	Port Number	Description
FTP	20	file transfer protocol : Transferring data
FTP	21	file transfer protocol : Start connection
SSH	22	Secured Shell
Telnet	23	Remote Administration
SMTP	25	Simple Mail Transfer Protocol : Mail Transfer Agent ( MTA )
DNS	53	Domain Name System
Bootp	67
DHCP	68	Dynamic Host Configuration Protocol
TFTP	69	Trivial File Transfer Protocol
HTTP	80	Hyper Text Transfer Protocol
Kerberos	88	computer network authentication protocol which works on the basis of 'tickets' to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner.
POP3	110	Post Office Protocol 3 : Mail delivery Agent
NTP	123	Network Time Protocol
NetBIOS	137	used in Samba
SMB	139	Used in SMB ( smbd )
NetBIOS	139	used datagram
SMBD	445	Post Office Protocol 3 : Mail delivery Agent
IMAP	143	Internet Message Access Protocol
HTTPS	443	Hyper Text Transfer Protocol : used ssl for secure web
Syslogd	514
Ldaps	636
FTPs	989	File Transfer Protocol Secure : used for data transfer
FTPs	990	File Transfer Protocol Secure : used for connection create
IMAPs	993	Internet Message Access Protocol
POP3s	995	Post Office Protocol 3
OpenVPN	1194
Ldaps	636
NFS	2049	Network File System
MySQL	3306	It's a database system
Squid	3128	it's a proxy server