IP filter allows you to control what IP traffic would be allowed inside and out of your network.
Step 1: Open a web browser and go to http://cudy.net or http://192.168.10.1.
For details, please refer to How to log into the web interface of Cudy Router?
Step 2: Click Advanced Settings -> IP Filter in the Security section.

Step 3: Check settings on IP Filter page.

• To block the specific IP address(es)
1. Select 'Allow all except list'.
2. Type in the IP Address(es) you want to block and choose the correct Subnet mask.
Example: All devices are not able to access the Cudy official website.

3. Save & Apply the operation.
• To allow the specific device(s)
1. Select 'Allow list only'.
2. Type in the IP Address(es) you are allowed to access.
Example: Only allowed to access the Cudy website, the other website will not be able to load.

3. Save & Apply the operation.
Note: When you don't want to limit the internet, choose 'Disable' from the drop-down list and save the settings, not only 'Delete' the item.
2 comments
@Nick
Dear Nick,
For 34.18.0.0-34.18.255.255 is the same as 34.18.0.0 mask 255.255.0.0, So, you can set
IP Address 34.18.0.0, Mask 255.255.0.0.
“How do I filter an entire range without having to enter many many IP addresses, for eg: 34.18.0.0-34.18.255.255.”
How do I filter an entire range without having to enter many many IP addresses, for eg: 34.18.0.0-34.18.255.255.