20 common port numbers and their purposes

20 common port numbers and their purposes

1. 20 Common port numbers & their purposes

2. Protocol: (FTP) Port number (20-21) FTP stands for File Transfer Protocol P rotocol for transferring files over a network. It supports both anonymous and password-mediated access .

3. Protocol: (SSH) Port number (22) SSH stands for Secure Shell Its an encrypted remote access tool. It supports file transfers and encrypting other protocols.

4. Protocol: (Telnet) Port number (23) It’s seldom used today, although its client program, telnet, can be a useful network diagnostic tool.

5. Protocol: (SMTP) Port number (25) SMTP stands for Simple Mail Transfer Protocol Main protocol for moving email on the Internet. The sender initiates SMTP transfers

6. Protocol: (DNS) Port number (42) DNS stands for Domain Name Service enables computers to look up an IP address by providing a hostname, or vice-versa.

7. Protocol: (BOOTP, DHCP) Port number (67) BOOTP stands for Bootstrap Protocol DHCP stands for Dynamic Host Configuration Protocol B oth enable a computer on a local network to help automatically configure other computers to use a network.

8. Protocol (HTTP) Port number(80) HTTP stands for Hypertext Transfer Protocol HTTP is the basis of the World Wide Web

9. Protocol: (POP2 and POP3) Port number (109–110) POP stands for Post Office Protocol It enables a recipient to initiate an email transfer, it’s often used as the last leg in email delivery, from a server to the recipient.

10. Protocol: (SQL) Port number (118) SQL stands for Structured Query Language Its a network-enabled database interface language. If you run an SQL server on your network, client computers can access and modify that database.

11. Protocol: (SMB/CIFS) Port number (137–139) SMB stands for Server Message Block CIFS stands for Common Internet File System protocols for file and printer sharing, and Samba implements these protocols in Linux.

12. Protocol: (IMAP) Port number (143 , 200) IMAP stands for Internet Message Access Protocol Its another recipient-initiated email transfer protocol, similar to POP. IMAP makes it easier for recipients to permanently store and manage email on the server computer, though.

13. Protocol: (LDAP) Port number (389) LDAP stands for Lightweight Directory Access Protocol A network protocol for accessing directories, which in this context are a type of database.

14. Protocol: (HTTPS) Port number (443) This protocol is a secure (encrypted) variant of HTTP.

15. Protocol: (NFS) Port number (2049) NFS stands form Network File System A protocol, and a server of the same name, for file sharing between Unix and Unix-like OSs