What is Port Checker | Port Scanner ?

Port Checker | Port Scanner is a free online tool for checking open ports on your device. It's useful for testing port settings on your router. If you're experiencing connection problems with a program (like email or instant messaging), it could be because your router's firewall or your ISP is blocking the required port. This tool can help diagnose firewall issues. It's also handy for security—check whether a port is open or closed. If you host games like Minecraft, use this checker to ensure your server port (25565) is configured correctly for friends to connect.

Commonly Used Port Ranges

Port numbers range from 1 to 65535, and they're categorized into three groups:

• 1-1023 - Well-known ports (e.g., HTTP, SMTP, DHCP, FTP)
• 1024-49151 - Reserved Ports
• 49152-65535 - Dynamic/Private Ports

Well-Known Ports

• 20 & 21 - FTP (File Transfer Protocol)
• 22 - SSH (Secure Shell)
• 23 - Telnet (Remote Login Service)
• 25 - SMTP (Simple Mail Transfer Protocol)
• 53 - DNS (Domain Name System)
• 80 - HTTP (Hypertext Transfer Protocol)
• 110 - POP3 (Post Office Protocol 3)
• 115 - SFTP (Secure File Transfer Protocol)
• 123 - NTP (Network Time Protocol)
• 143 - IMAP (Internet Message Access Protocol)
• 161 - SNMP (Simple Network Management Protocol)
• 194 - IRC (Internet Relay Chat)
• 443 - SSL / HTTPS (Hypertext Transfer Protocol Secure)
• 445 - SMB (Server Message Block)
• 465 - SMTPS (Simple Mail Transfer Protocol over SSL)
• 554 - RTSP (Real Time Stream Control Protocol)
• 873 - RSYNC (RSYNC File Transfer Services)
• 993 - IMAPS (Internet Message Access Protocol over SSL)
• 995 - POP3S (Post Office Protocol 3 over SSL)
• 3389 - RDP (Remote Desktop Protocol)
• 5631 - PC Anywhere
• 3306 - MySQL (Database)
• 5432 - PostgreSQL (Database)
• 5900 - VNC (Virtual Network Computing)
• 6379 - Redis (Database)
• 11211 - Memcached (Database)
• 25565 - Minecraft (Game Server)

If you've any feedback/suggestion for this website, please let me know.