You can check your DNS records on dnsstuff.com by doing the following:
Go to http://www.dnsstuff.com/
Look for the box labeled DNS lookup and put the domain you wish to check in the box.
After that, select the type of record you wish to check (For example: A, MX, NS, SOA, etc.).
Click on the Lookup button.
On the next page you will see the results.
You can also check your DNS records using "DiG" on *NIX systems, or you can check them using "nslookup" on Windows systems.