Opening Ports in a Asus RT-AC66U Router

This is the port forwarding guide for the Asus RT-AC66U 380.We also have port forwarding guides for the following related routers:

Pick the guide that most closely matches your router.

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Port Forward Staff
July 10, 2017 (Last Updated: ) | Reading Time: 5 minutes

You probably know that your Asus RT-AC66U 380 router comes with a basic firewall that helps protect your home network from unwanted Internet access, but do you know how it does that? Your Asus RT-AC66U 380 firewall works by blocking all Internet connections that are not authorized by your router. Some online games or programs will run much smoother if you have additional connections opened up. The way you allow more connections to be opened is a port forward. This takes the named port and directs it at the computer you choose.

In this guide I will show you exactly how to port forward on the Asus RT-AC66U 380 router. The steps I will be covering in this guide are:

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Step 1

It is important to setup a static ip address in the device that you are forwarding a port to. This ensures that your ports will remain open even after your device reboots.

This step is important because you want a permanent IP address in your device. If you do not set up a permanent IP address in your device, then when you device reboots it may get a new IP address.

TIP: Write this static IP address down. You need it a little later in the process.

Step 2

It is time to login to the Asus RT-AC66U 380 router. To do this you need to open a web browser on your computer because the router uses a web interface. It typically doesn't matter which browser you decide to use, I recommend picking one that is familiar to you (like the one you are using right now). Common web browsers to choose from are Chrome, Internet Explorer, and Firefox.

Once you have opened the web browser, find the address bar. This is normally at the top of the page like this:

Image of a browser address bar
Browser address bar

Above is an example of what a web browser address bar looks like. Find the address bar in your router and type in your router's IP address.

The default Asus RT-AC66U IP Address is:

If that address did not work or you know you have changed it in the past, you need to find out what the router's IP address has been changed to. To find out follow the directions on the How To Find Your Router's IP Address page.

After you have entered the correct IP address into the address bar, click the Enter key on your keyboard. This should take you to an authentication page similar to this:

Asus RT-AC66U Login
Screenshot of Asus RT-AC66U Login.

All you do here is enter the Asus RT-AC66U 380 router username and password.

Having Trouble?

If you find yourself stuck and unable to gain access to the Asus RT-AC66U 380 router access there are a few things you can try:

  • First, I always recommend trying other default Asus passwords. Router manufacturers are always updating the router's firmware so if your username and password did not work, it may have been updated and changed. Here is our list of common Default Asus Router Passwords.
  • If that did not work it is probably because you changed the router's username and password in the past and don't remember what it was changed to. Try guessing a few times, or try our Find Password App. Learn more about it on this page.
  • Finally, if nothing else works, it may be time to consider a factory reset for the Asus RT-AC66U 380 router. Do not reset the router unless you have no other options. A reset erases everything you have ever changed in the past. A full reconfiguration of the router will be needed after a factory reset is complete. Learn the basics of resetting a router on this How to Reset a Router page.

Step 3

In this third step, I will show you how to find the port forwarding section of the router. To do this, I will begin on the Network Map page of the Asus RT-AC66U 380 router.

Asus RT-AC66U Network Map
Screenshot of Asus RT-AC66U Network Map.

First, click the WAN option in the left sidebar.

Asus RT-AC66U Internet Connection
Screenshot of Asus RT-AC66U Internet Connection.

This takes you to a page similar to the one you see above. Click the tab at the top of the page labeled Virtual Server / Port Forwarding.

Asus RT-AC66U Virtual Server Port Forwarding
Screenshot of Asus RT-AC66U Virtual Server Port Forwarding.

You are now on the correct page to make a port forward entry.

Step 4

Here are the ports to forward for Xbox Live:

  • TCP Ports: 3074
  • UDP Ports: 3074

If you are looking for the ports for a different application you can find it by either:

Create a name for this forward and put it in the Service Name box. The name is only used as a reminder and has no effect on the port forward.

The Source Target box cab be left blank.

In the Port Range box put the ports to forward.

These ports can be entered as a list 23,24,25, a range 500-600, or a combination of both 23,45,500-600.

Enter the IP address that you are forwarding ports to in the Local IP box. This is either the IP address of a computer or the IP address of another device on your network.

The protocol that you want to forward is selected from the Protocol box.

After you are done click the + button.

Make sure to Apply all the changes after you have finished creating your port forward.

Was Your Port Forward Successful?

Now that you have forwarded ports on the Asus RT-AC66U 380 you should test to see if your ports are forwarded correctly.

To test if your port has been properly forwarded, I recommend using our Network Utilities tool, which includes a free Open Port Checker. Our Open Port Check tool is the only online port checking tool with Guaranteed Results.

More Information

Here at we have more than just port forwarding guides. Check out our networking, software, and gaming guides here.

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