How to check for CGNAT?

Issue

All Firewall exclusions and Port forwarding rules are set up correctly, yet nobody can join your home-hosted Server?

If you have connection problems and you are using a Hosting-Service, contact them for assistance. If you want to use a VPS or cannot host a server at home, take a look at our list of Partnered hosting services (Server setup documentation).

What even is CGNAT?

For a detailed explanation, on what CGNAT is and why it's an issue when trying to host a server at home, take a look at this page.

How to check for CGNAT?

Method 1:

Open a command prompt, run tracert -4 beammp.com. This will output a series of network hops. Wait for the operation to finish (may take up to 30 hops). Check the first few IP addresses after the IP of your Router/Modem/Gateway. If multiple IP addresses within the range of 100.64.x.x-100.127.x.x or 10.xx.xx.xx appear after the first hop, you are most likely behind a CGNAT.

Note

The first hop will be your Router/Modem/Gateway and differs between Devices. The official ranges for local networks are as follows: 10.0.0.xxx - 192.168.xxx.xxx - `172.16.xxx.xxx

Method 2:

Find out the WAN IP on your router by looking it up on its interface. Compare it to the IP posted on e.g. https://whatsmyip.org . If they are NOT the same, you are behind a CGNAT.

Method 3/Solution:

Call your Internet Service Provider for assistance. Depending on your ISP, they might not offer dedicated dynamic IP adresses. Keep in mind, that a static IP is not necessary.

Warning

Internet Service Providers may only offer dedicated IP addresses as a paid option. Please check the prices of our partnered hosting services as they could be cheaper than this fee!

Example of a non-CGNAT Network:

Tags: Server, 10060 10061, CGNAT, Connection Failed, Port Forward, Firewall