{"id":84,"date":"2025-11-05T19:11:46","date_gmt":"2025-11-05T19:11:46","guid":{"rendered":"https:\/\/ipv4chicken.com\/tech\/common-firewall-ports-every-it-beginner-should-know\/"},"modified":"2025-11-05T19:11:46","modified_gmt":"2025-11-05T19:11:46","slug":"common-firewall-ports-every-it-beginner-should-know","status":"publish","type":"post","link":"https:\/\/ipv4chicken.com\/tech\/common-firewall-ports-every-it-beginner-should-know\/","title":{"rendered":"Common Firewall Ports Every IT Beginner Should Know"},"content":{"rendered":"\n

Common Firewall Ports Every IT Beginner Should Know<\/h1>

Firewalls filter traffic using ports and protocols. If you\u2019re entering the IT or cybersecurity field, learning commonly used firewall ports is essential. This guide explains important network ports in easy language so you can understand and remember them.<\/p>

What Are Network Ports?<\/h2>

Ports are virtual communication endpoints used by applications. Just like a house has multiple doors, computers have many network ports. Firewalls decide which ports to allow or block.<\/p>

Most Common TCP\/UDP Ports<\/h2>
Port<\/th>Protocol<\/th>Service<\/th><\/tr>
20\/21<\/td>TCP<\/td>FTP<\/td><\/tr>
22<\/td>TCP<\/td>SSH (Remote Login)<\/td><\/tr>
23<\/td>TCP<\/td>Telnet (Not secure)<\/td><\/tr>
25<\/td>TCP<\/td>SMTP (Email)<\/td><\/tr>
53<\/td>UDP\/TCP<\/td>DNS<\/td><\/tr>
67\/68<\/td>UDP<\/td>DHCP<\/td><\/tr>
80<\/td>TCP<\/td>HTTP (Web)<\/td><\/tr>
110<\/td>TCP<\/td>POP3 (Email)<\/td><\/tr>
143<\/td>TCP<\/td>IMAP (Email)<\/td><\/tr>
443<\/td>TCP<\/td>HTTPS (Secure Web)<\/td><\/tr>
3389<\/td>TCP<\/td>RDP (Windows Remote Desktop)<\/td><\/tr>
5060\/5061<\/td>UDP\/TCP<\/td>SIP VoIP<\/td><\/tr> <\/table>

Why Ports Matter in Firewalls<\/h2>
  • Control access to services<\/li>
  • Prevent unauthorized connections<\/li>
  • Secure remote access<\/li>
  • Allow business apps (VoIP, VPN, DNS, etc.)<\/li> <\/ul>

    Blocked vs Allowed Ports<\/h2>

    Some ports are commonly blocked to prevent attacks:<\/p>

    • 23 \u2014 Telnet (unsecure)<\/li>
    • 445 \u2014 SMB (ransomware target)<\/li>
    • 137\u2013139 \u2014 NetBIOS<\/li> <\/ul>

      Ports Used in Cyber Attacks<\/h2>
      • Port 80\/443 \u2014 Web attacks (SQL injection, XSS)<\/li>
      • Port 23 \u2014 IoT botnet attacks<\/li>
      • Port 445 \u2014 WannaCry ransomware<\/li> <\/ul>

        Tips for Beginners<\/h2>
        • Never open unnecessary ports<\/li>
        • Use VPN + secure ports like SSH<\/li>
        • Monitor logs for unknown traffic<\/li> <\/ul>

          Understanding ports helps you manage firewalls, secure networks, and troubleshoot connectivity issues. Practice and you will memorize them easily.<\/p> <\/div>\n<\/body>","protected":false},"excerpt":{"rendered":"

          Common Firewall Ports Every IT Beginner Should Know Firewalls filter traffic using ports and protocols. If you\u2019re entering the IT or cybersecurity field, learning commonly used firewall ports is essential. This guide explains important network ports in easy language so you can understand and remember them. What Are Network Ports? Ports are virtual communication endpoints […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-firewall"],"yoast_head":"\nCommon Firewall Ports Every IT Beginner Should Know - IPv4Chicken<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ipv4chicken.com\/tech\/common-firewall-ports-every-it-beginner-should-know\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common Firewall Ports Every IT Beginner Should Know - IPv4Chicken\" \/>\n<meta property=\"og:description\" content=\"Common Firewall Ports Every IT Beginner Should Know Firewalls filter traffic using ports and protocols. 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