Can’t load some websites? Check your DNS server settings Your ISP might have outdated or erratic servers causing problems between you and the rest of the internet.

The easiest approach is simply to check a DNS rating website like DNSPerf. It's a constantly updated database of DNS provideras and how they perform.

Open DNS resolvers can vastly amplify the effect of a Distributed Denial of Service Attack. Is your DNS resolver a member of the DDoS zombie army?

Cloudflare's new Domain Name System promises to both speed up your internet access and protect your privacy.

F-Secure Router Checker is an online tool, that will scan the router settings of your Windows system and check if your DNS settings or Router have been hijacked or compromised.

This post will show you how to configure Domain Name System Security Extensions, DNS Socket Pool, and DNS Cache Locking on Windows Server.

Qualys also has a checker set up. You can head over there, and it’ll check for the DNS Changer Malware and any other issues you may want to get fixed on your computer.