Port Checker App - Check Open Ports For FREE
Port checker is a free online port scanner web app used to check the status of a network port on a device over an IP address (usually a server or computer) to determine whether it is open, closed, or filtered.
This is useful for network troubleshooting, verifying firewall configurations, or checking if a service (like a web server, FTP, or game server) is accessible from the internet.
How Many Most Commonly Used Ports Are There?
There are 28 most commonly used ports including:
| Port Number | Service |
|---|---|
| Port 194 | IRC (Internet Relay Chat) |
| Port 161 | SNMP (Simple Network Management Protocol) |
| Port 465 | SMTPS (Simple Mail Transfer Protocol over SSL) |
| Port 53 | DNS (Domain Name System) |
| Port 5631 | PC Anywhere |
| Port 110 | POP3 (Post Office Protocol 3) |
| Port 445 | SMB |
| Port 443 | SSL / HTTPS (Hypertext Transfer Protocol Secure) |
| Port 5900 | VNC |
| Port 993 | IMAPS (Internet Message Access Protocol over SSL) |
| Port 115 | SFTP (Secure File Transfer Protocol) |
| Port 8333 | Bitcoin |
| Port 554 | RTSP (Real Time Stream Control Protocol) |
| Port 3306 | MySQL |
| Port 873 | RSYNC (RSYNC File Transfer Services) |
| Port 5432 | PostgreSQL |
| Port 6379 | Redis |
| Port 3389 | RDP (Remote Desktop Protocol) |
| Port 80 | HTTP (Hypertext Transfer Protocol) |
| Port 22 | SSH (Secure Shell) |
| Port 25 | SMTP (Simple Mail Transfer Protocol) |
| Port 20 & 21 | FTP (File Transfer Protocol) |
| Port 25565 | Minecraft |
| Port 143 | IMAP (Internet Message Access Protocol) |
| Port 23 | Telnet (Remote Login Service) |
| Port 123 | NTP (Network Time Protocol) |
| Port 11211 | Memcached |
| Port 995 | POP3S (Post Office Protocol 3 over SSL) |
How To Check Open Ports?
To check open ports on a device, use our free open port checker app. Just enter the port number and the IP address of the device you want to check open ports for.
How To Check Open Ports On Windows?
To check open ports on windows use this command in windows CLI: netstat -ano
How To Check Open Ports On Mac?
To check open ports on a mac use this command in CLI: netstat -tulpn
How To Check Open Ports On Linux?
To check open ports on linux use this command in the CLI: netstat -tulpn
How To Check Open Ports On Android?
To check open ports on android use the free Port Droid app on the google play store.
How To Check Open Ports On A Router?
To check open ports on a router, use our free online port checker app.
How To Open A Port?
To open a port, configure your firewall or router depending on whether the port is for local access or external access.
How To Close A Port?
To close a port, configure your firewall or router accordingly.
What Is Port Forwarding?
Port forwarding or port mapping is a networking technique that allows external devices to access services on a private network by redirecting network traffic from one network port to another. It's commonly used to make services running on devices behind a router or firewall accessible from the internet.
How To Check Port Forwarding?
To check port forwarding, use our free port scanner tool
How To Check Port Forwarding For IPV6?
To check port forwarding, use our free online tool.
If the response is successful means port forwarding is working, else it’s not working.
How To Check Port Forwarding For TCP?
To check port forwarding for IPV6, use our free port checker app.
How To Check Port Forwarding For UDP?
To check port forwarding for IPV6, use our free port checker tool.
How To Check Port Forwarding For Windows?
To check port forwarding for IPV6, use our free port checker app.
How To Check Port Forwarding For Android?
To check port forwarding for IPV6, use our free port checker app.
What Are The Benefits Of An IP Port Checker App?
There are 3 benefits of an IP port checker including:
Quick and Easy Port Testing
Instantly check if a specific port on your network or device is open and accessible from the internet—no software installation required.
Helps Troubleshoot Connectivity Issues
It’s useful for diagnosing issues with gaming, remote desktop, or web servers by confirming whether firewall or NAT settings are blocking a port.
Improves Network Security Awareness
Helps identify open ports that might expose your system to unauthorized access, enabling you to take corrective action like closing unused ports.
What Is A Port?
A port is a numerical identifier that helps direct network traffic to the correct application or service on a device.
Port ranges from 0 to 65535.
How Many Types Of Ports Are There?
There are 2 types of ports namely UDP and TCP.
What Is A UDP Port?
A UDP port is a connectionless communication protocol in the Internet Protocol (IP) suite commonly used for speed-sensitive transmissions like video streaming, online gaming, and VoIP (Voice over IP).
UDP doesn't establish a connection, doesn't guarantee delivery, and doesn’t check for errors or order—making it faster but less reliable.
What Is A TCP Port?
A TCP port is a connected communication protocol in the Internet Protocol (IP) suite commonly used for non-speed-sensitive transmissions like web browsing, email, and file transfers.
TCP establishes a connection, guarantees delivery, and checks for errors or order—making it reliable but slower.