I recently changed my iPhone 5 DNS code. How do I get my original DNS code back?

So, I changed my iPhone 5 DNS code to this code here 190.14.36.90 in order to get the American version of Netflix. I want to change it back because my favourite apps such as twitter aren't working anymore but I do not know my original DNS code to change it back. Is there a mutual DNS code for all Irish iPhone 5's? Or did I have a specific code? Is there anyway of getting my code back? If so, how?

Hehe - Not a good idea, huh? Future reference: record your info before you change it.

That being said - call your ISP - Only they can answer your question. I highly doubt anyone in the States will know your ISP's DNS