Open vs Moderate vs Strict NAT Type: Meaning and Fix Path
Compare Open, Moderate, and Strict NAT type, learn why strict NAT happens, and follow the right path to improve it without guessing.
Open, Moderate, and Strict NAT are status labels used by games, consoles, and network tests to describe how easily other players or peers can connect back to your device.
These labels are practical rather than perfectly standardized. PlayStation, Xbox, Nintendo Switch, PC games, and online NAT tests may name results differently, but the user problem is the same: direct multiplayer, party chat, invites, or hosting may fail when the network is too restrictive.
Quick Answer
Open NAT usually means your device is easy for peers to reach. Moderate NAT means some peer paths work but compatibility is limited. Strict NAT means inbound paths are heavily restricted, so you should test NAT behavior, check router mappings, rule out double NAT, and then check whether the ISP is using CGNAT.
Open vs Moderate vs Strict NAT
| Status | What it means | Typical impact | What to do next |
|---|---|---|---|
| Open NAT | Your device can usually receive expected peer traffic with few restrictions. | Best compatibility for matchmaking, voice chat, invites, and player-hosted sessions. | Usually no change is needed unless one specific game still fails. |
| Moderate NAT | Some inbound paths work, but the network may not connect well with strict peers. | Most games can work, but party chat, joining friends, or hosting may be inconsistent. | Check UPnP, game-specific ports, device IP reservation, and double NAT. |
| Strict NAT | Inbound paths are blocked or too narrow for direct peer connectivity. | You may be unable to host, hear some party members, receive invites, or connect with other strict players. | Run the test, verify public WAN IP, check port mappings, then rule out Double NAT and CGNAT. |
Why NAT Type Becomes Moderate or Strict
UPnP is off or unreliable
Many games ask the router to open temporary mappings automatically. If UPnP is disabled, buggy, or blocked by another router, the result may stay Moderate or Strict.
Required ports are missing
A manual port forwarding rule must point to the correct device IP and protocol. UDP-heavy games will not be fixed by TCP-only rules.
Double NAT at home
An ISP gateway plus a separate router can create two translation layers. Forwarding on only one device may not expose the console or PC.
Carrier-grade NAT from the ISP
If the ISP places you behind CGNAT, your router may not have a normal public IPv4 address, so inbound forwarding cannot reach your home.
Firewall, VPN, or hotspot policy
Router firewalls, OS firewalls, security suites, VPNs, mobile hotspots, hotels, dorms, and office networks often block inbound traffic.
Platform-specific test labels
One console may call a result Moderate while another app calls similar behavior Restricted or Type 2. Compare labels, but debug the actual connectivity path.
How to Improve NAT Type Without Guessing
1Run a NAT test on the problem network
Test from the same Wi-Fi, Ethernet, console, or PC network where the issue happens. Do not compare a phone on cellular data with a console on home Wi-Fi.
2Reserve a stable local IP for the device
If rules point to an old local IP after a reboot, port forwarding will fail even though the router page looks correct.
3Enable UPnP if appropriate
UPnP is often the simplest fix for consoles and games on trusted home networks. Restart the game or device after changing it.
4Forward the correct ports only when needed
Use the platform or game documentation for ports and protocols. Avoid forwarding broad ranges unless the device or service really requires them.
5Check for Double NAT
If your router WAN IP is private and you control the upstream gateway, bridge the ISP gateway or use access point mode.
6Check for CGNAT
If the router WAN IP is shared/private or different from the public IPv4 address and you cannot remove the upstream NAT, ask the ISP about public IPv4 or use IPv6, relay, tunnel, or hosted server options.
How Platforms Name NAT Type
| Platform | Common labels | How to read it |
|---|---|---|
| PlayStation | Type 1, Type 2, Type 3, NAT Type Failed | Type 2 is usually acceptable; Type 3 or NAT Type Failed needs troubleshooting. |
| Xbox | Open, Moderate, Strict, Double NAT detected | Xbox labels map closely to the Open/Moderate/Strict language in this guide. |
| Nintendo Switch | Type A, B, C, D, F | Type A/B are usually better; Type D/F often need router or ISP checks. |
| PC games | Open, Moderate, Strict, Restricted, Symmetric | PC labels vary by game, launcher, firewall, and network test method. |
Useful Next Checks
FAQ
Is Open NAT always required?
No. Open NAT is the most compatible result, but Moderate or Type 2 is often enough for normal matchmaking. You usually need to troubleshoot when invites, party chat, hosting, or joining friends fails.
Is Moderate NAT bad?
Moderate NAT is a warning, not an automatic failure. It means some peer paths are limited, especially when the other player also has a restrictive NAT.
Can I change Strict NAT to Open NAT?
Often yes if the problem is inside your router: UPnP, device IP reservation, port forwarding, or double NAT. If the ISP is using CGNAT, you may need public IPv4, IPv6, a relay, or a hosted server.
Does Strict NAT mean slow internet?
Not necessarily. Strict NAT mainly affects inbound peer connectivity. Download speed can be fast while party chat, hosting, or P2P sessions still fail.
Avoid risky shortcuts
Do not place a whole PC or console in DMZ until you understand the exposure. Prefer UPnP or narrow port forwarding for a specific device and service, and confirm whether the real issue is Double NAT or CGNAT first.