Part of managing a server or even a single website is making sure the DNS is sound and in compliance with established networking and Internet standards. While you can evaluate each of your DNS entries manually, there are many services out there that make evaluation very easy.
One such service is called intoDNS, which is currently still listed as beta, but it functions very well. To use it, simply visit intodns.com and type your full domain name (excluding the “www”). Then, click “Report”. It will then scan your domain and report on a number of important issues: Domain Nameserver records, TLD parent check, CNAMEs, etc.
When your domain passes one of the tests, the service will give you a green circle with a check next to it. When there is an area of concern, you will receive a blue circle with an “i” in it. When you have an error, it will give you a red circle with an exclamation mark. All of the information is displayed in basic HTML so that you can easily print or save it.