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What is Port number ?

The port number is a 16 bit binary number in the TCP. Therefore the port number is in the range of 0-65535.The port numbers are divided into three ranges.

  • Well Known ports.
  • Registered Ports.
  • Dynamic Ports/Ephemeral ports

Well known Ports

The port numbers ranging from 0-1023.They are assigned to standard server processes such as FTP, Telnet. The numbers are assigned by IANA

Port

Protocol

Description

7

Echo

Echoes a received datagram back to the sender.

9

Discard

Discards any datagram that is received

11

Users

Active user

13

Daytime

Returns the data and the time

17

Quote

Returns a quote of the day

19

Chargen

Returns a string of characters

20

FTP, Data

File Transfer Protocol(data connection)

21

FTP, Control

File Transfer Protocol(Control connection)

23

TELNET

Terminal Network

25

SMTO

Simple Mail Transfer Protocol

53

DNS

Domain Name Server

67

BOOTP

Bootstrap Protocol

79

Finger

Finger

80

HTTP

Hypertext Transfer Protocol

111

RPC

Remote Procedure Call

Registered Ports
The ports ranging from 1024 - 49151 are to be registered with IANA to prevent duplicating. They can be used for proprietary server processors or nay client process.

Dynamic Ports
The ports numbers from 49152 – 65535 are dynamic or ephemeral ports. It can be frequently used. Normally they are used by client process temporarily. The client process need not have a fixed port number. For example a client can access the server with client port number 50000. after terminating that connection, if the client need to make a connection with server again, the second time client can arbitrarily select port number 65004.

IP Address?
IP Number?
Static IP Address?
Port Number
MAC Address
Dynamic IP Address?
Private IP Address?
Public IP Address?
DHCP
Host Name
ISP?
TCP/IP?
IP version (IPv4)

VPN
DNS

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