This is an interesting idea that might be an easy way to eliminate at least some of the malware epidemic. I enabled it on my Macbook for the past day or two and haven’t noticed it really, which I guess just means I haven’t tried to access any sites that have been distributing malware.
A new DNS service called Quad 9 launched recently. As you might expect from the name, its IP address is 220.127.116.11. It’s run by a variety of respected IT and internet organisations including IBM. As well as converting names to numbers, it also helps to prevent you from inadvertently accessing web sites that might contain malware. It does this by simply not providing a conversion for suspicious sites. So your PC won’t be able to access them by name.