Please login to your router:

Vigor 130

User name: admin

Password: admin

OR

Vigor 120

User name: admin

Password: blank (no password)

Step 1:

Create a firewall filter under default data filter by following the snapshot.

Name it as Block Reddit and click the active checkbox.

Step 2:

Add a Filter data and click on filter 2.

Use the following configuration:

Direction: LAN to WAN

Source: Any

Destination: Select range

198.41.208.100-198.41.208.200(This is the range of reddit.com public IP list)

Service Type: Any

Filter: Block Immediately

Step3:

Repeat step 2 and create a filter 3, change the address range

Direction: LAN to WAN

Source: Any

Destination: Select range

198.41.209.100-198.41.209.200(This is the range of reddit.com public IP list)

Service Type: Any

Filter: Block Immediately

Confirm by browsing to reddit.com

This will block only reddit.com and allow the rest of the traffic.

Reddit.com is a https website, please note that the same method can be used to block any https website by putting the correct range of their Public IPs and using the filter block.