Free network tool
Port Checker
Test whether a TCP port is open on any host and how fast it responds.
Live results. Public network data is never stored.
Advertisement
Why use this tool
A port is a virtual endpoint on a server. This tool attempts a TCP connection to a host and port and reports whether it is open, plus the connection latency.
Use it to verify web servers (80/443), mail (25/587), databases (3306/5432) or game servers before you connect from a client.
Features
Check any TCP port 1–65535
Reports open or closed with latency
Works with domains and IPs
Instant results with a 5s timeout
Advertisement
How it works
-
1
Enter a host or IP
-
2
Enter the port number
-
3
Click "Check" — see if it is open
Advertisement
Frequently asked questions
What does an open port mean?
A service is listening and accepting connections on that port. A closed port refuses them.
Why would my port show closed?
The service may be down, a firewall may block it, or your ISP/VPN may block inbound testing.
Which ports are commonly checked?
80/443 for web, 22 for SSH, 25/587 for mail, 3389 for RDP, and 25565 for Minecraft servers.