NAT Checker
Free, fast, accurate NAT check for developers and gamers on PS5, Xbox, Switch, and PC. Understand network status and improve play.
About NAT Checker
NAT Checker is a free online tool that detects a user's NAT (Network Address Translation) type, along with public IP address and IPv6 availability and reachability. It uses server-assisted classification based on observed connection behavior rather than requiring downloads, account creation, or device permissions, and completes tests within a 20-second timeout.
The tool classifies connections into categories such as Open Internet/Full Cone, Restricted, Port Restricted, and Symmetric NAT, and maps these to platform-specific labels used by PlayStation, Xbox, and Nintendo Switch. It also provides platform guides covering PS5, Xbox Series X/S, Nintendo Switch, Windows PC, and router settings, along with guides addressing topics like CGNAT and strict NAT troubleshooting.
The tool is intended for gamers and general users troubleshooting connectivity issues related to online multiplayer gaming, voice chat, video calls, and peer-to-peer applications. No accounts or paywalls are required to use it.
Key features
- Detects IPv4 NAT type via server-assisted classification
- Surfaces IPv6 availability and reachability alongside IPv4 NAT type
- Maps NAT results to platform-specific labels for PS5, Xbox, and Nintendo Switch
- Free to use with no accounts or paywalls
- Delivers live results within a 20-second overall timeout
- Works globally with globally reachable infrastructure
Frequently asked questions
What does this NAT test check?
It checks your IPv4 NAT type, public IP address, NAT status, and IPv6 availability and reachability. It works as a NAT type checker for gaming, P2P, voice chat, and general network troubleshooting.
Is NAT Checker free to use?
Yes, it is always free with no accounts or paywalls required.
Why do PS5, Xbox, and Switch show different NAT labels?
Consoles use platform-specific labels: PlayStation commonly shows Type 1, Type 2, or Type 3; Xbox shows Open, Moderate, or Strict; Nintendo Switch shows Type A through F. NAT Checker reports the underlying network behavior it observes rather than a single console's label.
Why is my NAT type strict?
Strict NAT can come from router, firewall, or upstream network restrictions, and the site's Strict NAT troubleshooting guide helps identify the cause before changing settings.
Who is NAT Checker for?
It is built for gamers and everyday users who want clear, reliable network diagnostics for troubleshooting gaming connections, voice chat issues, or general curiosity about network behavior.
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