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Port Number

 

WHAT IS A PORT NUMBER

1. A PORT IS NOT PHYSICAL CONNECTION IT IS A LOGICAL CONNECTION THAT IS USED BY PROGRAMS AND SERVICES TO EXCHANGE INFORMATION.

2. IT IS SPECIFICALLY DETERMINE WHICH PROGRAMOR SERVICES  ON A COMPUTER AND SERVER THAT IS GOING TO BE USED.

FOR EXAMPLE :  WEBPAGE  ,  EMAIL ,  FTP

3. PORT IS A UNIQUE NUMBER THAT INDENTIFIES THEM.   0-65535 

 COMMON PORT NO 80,443 IS WEBPAGE(HTTP AND HTTPS AND FTP IS 21.

4.  A PORT IS ALWAYS ASSOCIATED WITH AN IP ADDRESS.

FOR EXAMPLE  IP ADDRESS IS 192.68.1.1 AND PORT NO IS 21

 SO COMBINE THE IP AND PORT IS   192.168.1.1:21

5. PORT NO 0-65535 RANG THE FOR ASSIGNED BY IANA (INTERNET ASSIGNED NUMBER ATHOUROTY)

PORT NO ARE BROKEN DOWN 3 CATEGORIES

1.  PORT NUMBER 0-1023 IS CALLED SYSTEM AND WELL-KNOWN PORTS.

EXAMPLE : 80 , 25 , 443 , 21.

2.  PORT NUMBER 1024-49151 ARE CALLED USER OR REGISTERED PORTS. 

THEY ARE PORT THATCAN BE REGISTERED BY COMPANIES OR DEVOLPER FOR A PARTICULAR SERVICE.

EXAMPLE :  1102 ADOBE SERVICE AND  1527 ORACLE AND 1433 MICROSOFT SQL SERVER.

3. PORT NUMBER 49152 ARE CALLED DYNAMIC AND PRIVATE PORTS.

THEY ARE CLIENT-SIDE PORT THAT ARE FREE TO USE. 

THESE ARE PORTS THAT YOU COMPUTER ASSIGNS TEMPORAILY TO ITSELF DURING  A SESSION.

________________I

IMPORTANT  PROTOCOLS AND HIS PORT NUMBERS 

1. TCP/IP     PORT NO : 3360
2. HTTP       PORT NO :  80
3. SMTP       PORT NO:  25
4. PPP       PORT NO :  110
5. FTP       PORT NO :   21
6. TELNET     PORT NO  :  23
7 . IMAP    PORT NO :  143
8. DNS    PORT NO :  53
9. SSL  PORT NO : 443
10. HTTPS    PORT NO :  443

11.  SSH   PORT NO :  22 

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