natchecker.com
NAT Type Test
Free online NAT type checker for gaming and networking—tests open/moderate/strict NAT behavior fast in your browser, with no downloads or sign-up.
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25
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Popularity
High
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About tool
NATChecker is a free, browser-based tool that helps you detect your NAT type instantly. It’s designed for gaming (PS5, Xbox, PC) and troubleshooting connectivity issues in peer-to-peer applications, voice chat, and other real-time network scenarios.
After you run the test, you get results that classify your NAT behavior as open, moderate, or strict, along with your IPv4 NAT type and public IP information. It also reports IPv6 availability and includes the outcome of an external WebRTC/UDP connectivity check.
If you’re trying to understand why matchmaking is slow, voice chat is inconsistent, or direct connections fail and fall back to relays, NATChecker provides clear diagnostics without requiring downloads, an account, or special device permissions.
What does NATChecker test when I run the check?
It checks your IPv4 NAT type, public IP address, NAT status, IPv6 availability, and the result of an external WebRTC/UDP connectivity check.
Which gaming platforms can I use NATChecker for?
It’s aimed at gaming connectivity for PlayStation 5, Xbox, and PC.
Does NATChecker require downloading anything or creating an account?
No—everything runs in your browser with no downloads, registration, or sign-up.
What do open, moderate, and strict NAT results mean for connectivity?
Open NAT generally allows the fewest restrictions for inbound reachability, while moderate NAT adds limits, and strict NAT typically blocks or fails direct peer connections more often—leading to more reliance on relays.
What does “External connectivity not confirmed” mean for IPv6 results?
It indicates the external WebRTC/UDP connectivity check for IPv6 wasn’t confirmed, which can help explain IPv6-related connection limitations.
Is this the same as a UPnP test or a port-forwarding test?
The check focuses on observable NAT behavior and an external connectivity test rather than validating router UPnP status or verifying port forwarding rules.