Nat3

Nat3 is a term used in several distinct domains, and there is no single subject universally identified as Nat3. The most common reference is in computer networking where Nat3 denotes a NAT Type 3 classification.

NAT Type 3 describes a device behind a router performing Network Address Translation in a way that blocks unsolicited inbound connections. It is often labeled as “NAT Type 3” or “Type 3 NAT” in gaming consoles and multiplayer applications. This restricts peer-to-peer connections, hosting game servers, and certain online features. Resolution strategies include enabling UPnP on the router, manually forwarding ports used by the application, placing the device in a DMZ, enabling bridge or pass-through modes, or using IPv6 where available.

In other contexts, Nat3 may appear as a brand name, model number, or code in hardware, software, or media. Because the term is not standardized, its meaning depends on the specific product or project and should be interpreted from accompanying documentation.

See also

NAT, NAT type, port forwarding, UPnP, DMZ, IPv6