Ever wondered how your devices communicate seamlessly across networks? It all comes down to network port numbers, the unsung heroes of digital communication! As an experienced IT blogger, I can tell you that understanding these crucial identifiers is fundamental for anyone working with networks, from cybersecurity professionals to home users troubleshooting their internet.
This comprehensive table is your go-to quick reference guide for the most popular port numbers and their associated services. Whether you're setting up a server, configuring a firewall, or simply trying to grasp how email, web Browse, or file sharing actually work, knowing these ports is invaluable. They're the standardized doorways through which data flows, ensuring specific services reach their intended applications. Dive in, learn the essentials, and gain a clearer insight into the mechanics of network communication and security!
| Port Number | Protocol / Service | Description |
|---|---|---|
| 20 | FTP (Data) | File Transfer Protocol - data channel |
| 21 | FTP (Control) | Command/control for FTP |
| 22 | SSH | Secure Shell - remote login and file transfer |
| 23 | Telnet | Remote login, unsecured |
| 25 | SMTP | Simple Mail Transfer Protocol - sending email |
| 53 | DNS | Domain Name System - resolves hostnames |
| 67 | DHCP (Server) | Dynamic IP address assignment |
| 68 | DHCP (Client) | Receives IP address from server |
| 80 | HTTP | HyperText Transfer Protocol - unsecured web |
| 110 | POP3 | Post Office Protocol - retrieving email |
| 123 | NTP | Network Time Protocol - clock sync |
| 137-139 | NetBIOS | Windows file sharing (older systems) |
| 143 | IMAP | Internet Message Access Protocol - mail sync |
| 161/162 | SNMP | Simple Network Management Protocol |
| 389 | LDAP | Directory services (used in Active Directory) |
| 443 | HTTPS | Secure web Browse |
| 445 | SMB | Server Message Block - file sharing (modern) |
| 465 | SMTPS | Secure SMTP (SSL/TLS) |
| 514 | Syslog | System logging |
| 587 | SMTP (Submission) | Sending email with authentication |
| 636 | LDAPS | Secure LDAP |
| 993 | IMAPS | Secure IMAP |
| 995 | POP3S | Secure POP3 |
| 1433 | MS SQL Server | SQL database communication |
| 3306 | MySQL | MySQL database |
| 3389 | RDP | Remote Desktop Protocol |
| 5900 | VNC | Virtual Network Computing |
| 8080 | HTTP (Alternate) | Often used for proxies or web interfaces |
Understanding network ports is crucial for IT pros. This guide provides a vital quick reference, simplifying complex networking. Master communication, boost security, and troubleshoot effectively. Keep this essential knowledge handy!
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