Port Checker

Test if a specific port is open and reachable from the internet. Enter an IP address or hostname and port number to check.

Common ports:

How it works: This tool checks if a specific port is reachable from the internet. For accurate results on your own network, ensure port forwarding is configured on your router.

Common Ports Reference

PortServiceDescription
21FTPFile Transfer Protocol
22SSHSecure Shell
23TelnetUnencrypted remote access
25SMTPEmail sending
53DNSDomain Name System
80HTTPWeb traffic
443HTTPSSecure web traffic
3306MySQLMySQL database
3389RDPRemote Desktop
25565MinecraftMinecraft server

Frequently asked questions

What is a port?

A port is a virtual endpoint for network communication. Ports allow multiple services to run on a single IP address. For example, HTTP uses port 80, HTTPS uses port 443, and SSH uses port 22.

Why would a port be closed?

Ports can be closed by firewalls, ISP restrictions, or simply because no service is listening on that port. Routers also block incoming connections by default for security.

How do I open a port on my router?

Login to your router admin panel, find the Port Forwarding section, and create a rule that forwards the external port to your device's internal IP address and port.

What's the difference between TCP and UDP ports?

TCP ports provide reliable, ordered delivery of data with error checking. UDP ports are faster but don't guarantee delivery. Most web services use TCP, while gaming and streaming often use UDP.