Domain name service or DNS is only applicable to named lookups, which is most of which you type in your browser, Dns has no effect on numbers.(ip address's).
So to establish you arestill connected to the internet , do this : start/run/cmd/ type this in the run box,dos promt .then type
and press enter, if your still connected you will see replys from...
There are a few things you can do , but i would need a few more details of your setup.
if your using dhcp ie automatic settings , make sure they are still indeed on automatic.
Flush your dns by doing start/run/cmd /ipconfig /flushdns and press enter
you might also try ipconfig /release then ipconfig /renew , you can do a lot more than this , but i'm sure you don't have much of a problem.