What is the benefit of having an Open NAT type?

Having an Open NAT (Type 1) allows your gaming client to communicate directly with any player on the network, regardless of their router configuration. It provides the fastest matchmaking times, ensures you can host private lobbies, and prevents voice chat disconnects.

Why is my NAT type Strict even after forwarding ports?

If port forwarding on your router does not change your NAT to Open, your internet service provider (ISP) is likely using Carrier-Grade NAT (CGNAT). Under CGNAT, multiple households share a single public IPv4 address, blocking inbound port redirection until you request a dedicated static public IPv4 from your ISP.

Micro-Tool #39 • Multiplayer Networking Lab

Gaming Port Forwarding & NAT Type Open Wizard

Find exact TCP and UDP port forwarding ranges for Call of Duty: Black Ops 6, Warzone, GTA Online, FiveM, Rainbow Six Siege, and Minecraft. Switch your network to Open NAT (Type 1) and generate 1-click Windows Defender Firewall scripts.

Select Your Game & Hardware Platform

Select your title to reveal exact TCP and UDP port ranges required to achieve Open NAT Type (Type 1) and eliminate matchmaking connection drops.

Platform:

Router Port Forwarding Table for Call of Duty: Black Ops 6 & Warzone

VERIFIED 2026

TCP Port Range (Reliable Handshake)

3074, 27014-27050

UDP Port Range (Real-Time Game State)

3074, 3478, 4379-4380, 27000-27031

Notice: Failing to forward UDP 3074 causes "Moderate" or "Strict" NAT, resulting in longer matchmaking times and inability to hear party chat.

1-Click Windows Defender Inbound Firewall Script (PowerShell Admin)

New-NetFirewallRule -DisplayName "GameFixDB - Call of Duty: Black Ops 6 & Warzone (TCP)" -Direction Inbound -LocalPort 3074,27014-27050 -Protocol TCP -Action Allow; New-NetFirewallRule -DisplayName "GameFixDB - Call of Duty: Black Ops 6 & Warzone (UDP)" -Direction Inbound -LocalPort 3074,3478,4379-4380,27000-27031 -Protocol UDP -Action Allow; Write-Host "Ports Opened Successfully for Call of Duty: Black Ops 6 & Warzone!" -ForegroundColor Green

Run Windows PowerShell as Administrator and paste. This automatically unblocks both TCP and UDP ports through Windows Defender Firewall without manual GUI clicking.

Understanding NAT Types

TYPE 1: OPEN NATBEST

Can connect to and host lobbies with players of ANY NAT type. Instant matchmaking queues, zero party voice chat dropouts.

TYPE 2: MODERATE NATAVERAGE

Can only connect to Open and Moderate players. Cannot connect to Strict players. Noticeable lobby invite failures.

TYPE 3: STRICT NATRESTRICTED

Can ONLY connect to Open NAT players. Matchmaking takes 5-10x longer, voice chat is blocked, and hosting games is impossible.