Open Port Check Tool – Test Port Forwarding on Your Router
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Check a port’s status by entering an address and port number above.
The open port checker is a tool you can use to check your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall. This tool may also be used as a port scanner to scan your network for ports that are commonly forwarded. It is important to note that some ports, such as port 25, are often blocked at the ISP level in an attempt to prevent malicious activity.
For more a comprehensive list of TCP and UDP ports, check out this Wikipedia article.
If you are looking for a software solution to help you configure port forwarding on your network, try using this powerful Port Forwarding Wizard.
If my tool has been helpful to you, check out my desktop wallpaper site or follow me on Twitter @kirkouimet. Also, if your router is causing you massive grief try picking up a cheap Netgear N600 on Amazon.
Port Checker – Check Open Ports Online
What is Port Checker?
Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful
in testing port forwarding settings on a router. For instance, if you’re facing connection issues with a program
(email, IM client etc) then it may be possible that the port required by the application is getting
blocked by your router’s firewall or your ISP. In such cases, this tool might help you in
diagnosing any problem with firewall setup. You could also find this useful for security purpose, in case
you’re not sure whether 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 configured properly for port forwarding, then only your friends will be able
to connect to your server.
Most Commonly Used Ports
Port numbers ranges from 1 to 65535, out of which well known ports are pre-defined as convention by IANA.
0-1023 – Well known ports (HTTP, SMTP, DHCP, FTP etc)
1024-49151 – Reserved Ports
49152-65535 – Dynamic/Private Ports
Well known ports
20 & 21 – FTP (File Transfer Protocol)
22 – SSH (Secure Shell)
23 – Telnet, a 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
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
If you’re looking for a full list of port numbers
check out this wikipedia page. I’ve 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 target ip address (the device through which you’re visiting this web page), but you can
change the IP input field to check for other IP addresses – remote clients and servers as well. But, please don’t misuse this option
otherwise, I would have to restrict the IP address to source again (as I had done earlier). Please keep in mind that if you’re using a VPN
or proxy server then it may not be able to get your device’s IP correctly.
Understanding Port Forwarding
Port forwarding or port mapping involves translating the address (or port number to a new destination),
accepting the packets and forwarding it (using routing table). It’s typically used in connecting remote computers
to specific programs running on computer (in a private LAN (Local Area Network)). For example: running a public server (HTTP, port 80)
on a computer in a private LAN or granting SSH access to a specific computer in a private LAN etc.
Read More on Wikipedia.
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Open Port Check Tool — Verify Port Forwarding on Your Router
This is a free utility for remotely verifying if a port is open or closed. It is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports.
Port forwarding or port mapping allows remote computers to connect to a specific computer or service on a private network. This allows you to run a web server, game server or a service of your choosing from behind a router.
In a typical network the router has the public IP address and computers/servers obtain a private IP address from the router that is not addressable from outside the network. When you forward a specific port on your router, you are telling your router where to direct traffic for that port. This utility can verify the success of that process.
Please refer to your routers manual or manufacturer for assistance in setting up port forwarding.
Most residential ISP’s block ports to combat viruses and spam. The most commonly blocked ports are port 80 and port 25.
Port 80 is the default port for traffic. With blocked port 80 you will need to run your web server on a non-standard port.
Port 25 is the default port for sending and receiving mail. ISPs block this port to reduce the amount of spam generated by worms on infected machines within their network.
THE INFORMATION ON THIS PAGE IS STRICTLY FOR INFORMATIONAL PURPOSES ONLY. IT IS YOUR RESPONSIBILITY TO OBEY ALL APPLICABLE LOCAL, STATE AND FEDERAL LAWS. WE ASSUME NO LIABILITY AND ARE NOT RESPONSIBLE FOR ANY MISUSE OR DAMAGE CAUSED BY THE USE OF THE INFORMATION ON THIS PAGE.
Frequently Asked Questions about check a port
How can I test if a port is open?
Open the Start menu, type “Command Prompt ” and select Run as administrator. Now, type “netstat -ab” and hit Enter. Wait for the results to load, port names will be listed next to the local IP address. Just look for the port number you need, and if it says LISTENING in the State column, it means your port is open.Oct 9, 2021
How do I check my ports?
On a Windows computer Press the Windows key + R, then type “cmd.exe” and click OK. Enter “telnet + IP address or hostname + port number” (e.g., telnet www.example.com 1723 or telnet 10.17. xxx. xxx 5000) to run the telnet command in Command Prompt and test the TCP port status.5 days ago
How do I check my router ports?
Type “netstat -a” at the command prompt and press “Enter.” After a few seconds, all of the open ports on the computer. Locate all of the entries that have an “ESTABLISHED,” “CLOSE WAIT” or “TIME WAIT” value under the “State” header. These ports are also open on the router.