Level 3 is the company that provides a lot of ISPs their connection to the Internet backbone, so they are huge, reliable and secure. If you are leery of Google having too much information, I would suggest using a different DNS server. The main downside to using Google is that they are all about tracking and logging everything anyone does on the Internet and this is no exception. Some other services only have DNS servers located in one part of the world, so the performance will suffer considerably. The main benefit for using Google is their global data center and the fact that they have DNS servers located around the world. For me, this is a good option because I use other tools to filter out malware sites, etc and don’t necessarily want my DNS service to be involved.

They state that only under extraordinary circumstances would they block anything. It’s worth noting that Google Public DNS does not perform any blocking or filtering on the DNS requests, as some of the other services do. Their DNS servers are also well protected against DoS attacks and cache poisoning attacks. They also support the latest technologies and security mechanisms like IPv6 DNS servers and DNSSEC. Google being Google, they have massive scale, load-balancing, redundancy and DNS servers distributed all over the world. Once you have chosen a DNS service, read my post on how to change your DNS servers in Windows.

Also, be sure to read my post on finding the fastest public DNS server from your location using free utilities.

Google dns servers mac