Online NAT Type Checker

What is NAT?

NAT (Network Address Translation) is the process of converting a computer's IP address into another IP address for routing data packets across a network. There are four main types of NAT:

Full Cone NAT: Each external address and port can access an internal resource provided it initiates communication first
Restricted Cone NAT: An external address and port can access an internal resource only if it has previously communicated with that resource
Port Restricted Cone NAT: An external address and port can access an internal resource only if it has previously communicated with that resource through that port
Symmetric NAT: Packets sent to the same external IP address and port will be sent to different external IP addresses and ports. Each external user will get a unique address when they try to connect to the same internal IP address and port

The process of determining NAT type involves checking port availability and the state of the Internet connection to identify which of the four NAT types is being used in the network

Some description

How Does NAT Type Affect Your Connection?

NAT (Network Address Translation) is a process used by routers to map multiple local devices to a single public IP address when accessing the internet. This technique helps to conserve IP addresses and add a layer of security by hiding internal network addresses.

While NAT does not typically affect standard internet browsing, such as viewing web pages or streaming videos, it can have a significant impact on peer-to-peer (P2P) connections. For example, activities like online gaming, video conferencing, or file sharing that rely on direct connections between devices may experience issues depending on the NAT type.

Full Cone: Minimal restrictions, easy connection to other networks
Restricted Cone and Port Restricted Cone: Some restrictions, but still able to connect with most networks
Symmetric NAT: Highly restricted, often leads to connection problems with others, especially in gaming or video calls

In particular, if your network is behind Symmetric NAT, it cannot establish direct connections to computers in other private networks. Instead, the connection must be relayed through a public server, such as a relay or TURN server, which may add latency and reduce connection quality.

Choosing the correct NAT configuration is crucial for ensuring smooth online experiences, particularly for activities that rely on direct peer-to-peer connections.

NAT type distribution statistics is calculated for 10'000 users, latest update: 5^th October 2024. Have any questions or suggestions? Reach out to me at e-mail