Safari, Open DNS ect.

Recently was having problems with Safari being slow. Came across a forum, possibly even an Apple Discussions thread, and someone mentioned changed the DNS settings, for Safari to run faster - ( http://reviews.cnet.com/8301-13727_7-10354948-263.html).

I don't have much knowledge about it, other than reading this article ( http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 /) but I changed the settings nonetheless.

Seems to be working a littler faster, but just in case... is it possible to change back to my original DNS settings? Would the numbers be the same as on my wifi? Thanks.