Blogs

Port Checker – Check Open Ports Online

Posted on by admin

What is Port Checker?

Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful for testing port forwarding settings on a router. For example, if you’re facing connection problems with a program (email, instant messaging client, etc.), then it is possible that the port required by the application is being blocked by your router’s firewall or your ISP. In such cases, this tool could help you diagnose any problems with the firewall settings. You might also find this useful for security reasons, in case you’re not sure if a particular port is open or closed. If you host and play games like Minecraft, use this checker to make sure the server port (25565) is properly configured for port forwarding, then only your friends will be able to connect to your server.

Most used

ports

Port numbers range from 1 to 65535, of which known ports are predefined as an IANA convention.

0-1023 – Known ports (

  • HTTP, SMTP, DHCP, FTP, etc.) 1024-49151

    • – Reserved Ports

  • 49152-65535 – Dynamic/Private Ports Known ports

  • 20 and 21 – FTP

    • (File Transfer Protocol)

  • 22 – SSH (Secure Shell

    • ) 23 –

  • Telnet, a remote logon 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 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
  • 5432 – PostgreSQL
  • 5900 – VNC
  • 6379 – Redis
  • 11211 – Memcached
  • 25565– Minecraft

If you’re looking for a complete list of port numbers check out this wikipedia page. I have listed all the common ports above, feel free to enter any custom port number to check. By default, this site is taking your device’s IP address as the destination IP address (the device through which you are visiting this web page), but you can change the IP input field to check other IP addresses – remote clients and servers as well. But please don’t misuse this option, otherwise you would have to restrict the IP address to the source again (as you had done previously). Keep in mind that if you’re using a VPN or proxy server, then you may not be able to get your device’s IP properly.

Port

forwarding or port

mapping involves translating the address (or port number to a new destination), accepting packets, and forwarding them (using the routing table). It is typically used in connecting remote computers to specific programs running on the computer (on a private LAN (local area network)). For example: running a public server (HTTP, port 80) on a computer on a private LAN or granting SSH access to a specific computer on a private LAN, etc. Read more on Wikipedia.

Share on: Twitter Facebook

If you’ve had any comments/suggestions for this website, please let me know.

admin