Flush DNS

To day i got weird problem. I can not acces my blog. When i try use web proxy, there is no problem. Then I contact my hosting admin, he said there is no problem with the hosting. I also check my add on domain on the same hosting. I can access it with out problem. What’s wrong?

Before finishing chat with my hosting admin. He got idea. He ask me to flush my DNS. How to flush DNS?
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