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.

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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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Comments

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