Open Port Checker
Check which ports a server really exposes to the internet.
- Online check — sends only the host and port you type
- 100% free
- No sign-up
How to check open ports
- Type a host name or IP address.
- Pick a preset or type up to 24 ports.
- See which are open and their response times.
About Port Checker
Check which TCP ports are open on a server or IP.
It works in your browser for speed and privacy, remembers your settings on this device, and every result can be copied, downloaded or shared.
Good for
- Testing firewalls and port forwarding
- Checking game and web servers
- Finding exposed services
Tip: After changing firewall rules, check again from here — it shows what the internet sees.
Frequently asked questions
What does open, closed and filtered mean?
Open: a service accepted the connection. Closed: the server refused it. Filtered: a firewall dropped it silently, so there was no answer.
Is it safe and legal?
It makes one normal connection per port, like a browser does. Only check servers you own or have permission to test.
Why are database ports flagged?
MySQL, PostgreSQL, Redis, MongoDB, Elasticsearch and remote-desktop ports open to the whole internet are common causes of breaches — restrict them with a firewall or VPN.
Can it check my home router?
Type your public IP address to see which ports are reachable from the internet, for example for a game server or port forwarding.
Where are the ports tested from?
From our server, so you see what the internet sees — not your own network. Results aren't saved.