Home Router settings Setting Up ADnull DNS on an ASUS Router

Setting Up ADnull DNS on an ASUS Router

Last updated on Mar 16, 2026

These instructions apply to most ASUS models including RT-AX, RT-AC, and other routers running ASUSWRT firmware.

ADnull DNS addresses

Primary DNS 188.190.191.78

Secondary DNS 188.190.191.52

Step 1. Log in to the router web interface

Open a browser and go to:

http://router.asus.com

or

http://192.168.1.1

Enter your login and password. Default is admin / admin, or check the label on the bottom of the router.

Step 2. Go to WAN settings

In the left menu select:

WAN → Internet Connection

Step 3. Disable automatic DNS

Find the option Connect to DNS Server automatically and set it to No.

Step 4. Enter DNS addresses

Enter:

  • DNS Server 1: 188.190.191.78

  • DNS Server 2: 188.190.191.52

Click Apply.

Alternative — via DHCP/LAN

If the method above did not work:

LAN → DHCP Server

Enter:

  • DNS Server 1: 188.190.191.78

  • DNS Server 2: 188.190.191.52

Click Apply and restart the router.

Done!

ADnull DNS is now active. All devices on your network are protected — ads and trackers are blocked automatically.

FAQ

I cannot find router.asus.com

Try http://192.168.1.1 or check the label on the bottom of the router.

DNS was not applied after saving

Restart the router and reconnect your devices to Wi-Fi.

Where do I find the router password?

Check the label on the bottom of the router — it shows the login address, username, and default password.