Idea of Ports and Technologies used for Communication on the Internet

1

Hi Everybody,

As an Network Specialist, understanding Internet ports and communication terminology will be essential to resolving a large number of your trouble calls. So lets start idea gather……….

Ports

In TCP/IP networks, a port is the endpoint of a logical connection. Client computers connect to specific server programs through a designated port. All ports are assigned a number in a range from 0 to 65,535. An international agency, the Internet Assigned Numbers Authority (IANA), separates port numbers into three blocks: well-known ports, which are preassigned to system processes by the IANA; registered ports, which are available to user processes and are listed as a convenience by the IANA; and dynamic ports, which are assigned by a client operating system as needed when there is a request for service.

Port Ranges

There are three recognized blocks of port numbers.

Well-known ports: Port range: 0 to 1,023. Well-known ports are pre-assigned for use by common, or well-known, services. Often the services that run on these ports must be started by a privileged user. Services in this range include HTTP on TCP port 80, IMAP on TCP port 143, and DNS on UDP port 53.

Registered ports: Port range: 1,024 to 49,151. These ports are registered by software makers for use by specific applications and services that are not as well known as the services in the well-known range. Services in the registered port range include SOCKS proxy on TCP port 1080, Kazaa peer-to-peer file sharing on TCP port 1214, and Xbox Live on TCP and UDP port 3074.

Dynamic or private ports: Port range: 49,152 to 65,535. These ports are set aside for use by unregistered services, and by services needing a temporary connection.

Well-Known TCP Port Numbers

This table lists some of the most common well-known TCP port numbers.

Port Number

Service Name

Service

 

7

Echo Ping

20

FTP-Data File Transfer [Default Data]

21

FTP File Transfer [Control]

22

SSH SSH (Remote Login Protocol)

23

Telnet Telnet

25

SMTP Simple Mail Transfer Protocol

53

DNS Domain Name Service

80

HTTP World Wide Web HTTP

110

POP3 Post Office Protocol – Version3

137

NetBIOS NetBIOS Name Service

143

IMAP Internet Message Access Protocol

161

SNMP Simple Network Management

Protocol

389

LDAP Lightweight Directory Access Protocol

443

HTTPS HTTP-Secure

546

DHCPv6-Client DHCPv6 Client

547

DHCPv6-Server DHCPv6 Server

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