You need to change the layout of your keyboard. Not to another one, but to a new one that has been modified by an utility like Ukelele (there might be others).
Download the tool, drag the App to your Application folder. Notice that in the Disk Image, therexe2x80x99s a folder called System Keyboards/Roman/, copy that to you desktop (itxe2x80x99s temporal).
Launch Ukelele and from the File menu select: xe2x80x9cNew based onxe2x80xa6xe2x80x9d
Open the file Spanish-ISO.keylayout (found in the Roman folder that you saved to your desktop).
Youxe2x80x99ll see a big blue keyboard representing your current Spanish-ISO map (if you brought your computer in Spain, thatxe2x80x99s they keyboard you should use).
Double click on the xe2x80x9c,xe2x80x9d that you want to modify (or any other key) and youxe2x80x99ll see this:
Replace the xe2x80x9c,xe2x80x9d with the xe2x80x9c.xe2x80x9d (dot). And go to Keyboard Menu -> Set Keyboard Name. Rename the Spanish - ISO to something like: Spanish - ISO2.
Now save it, the name will be Untitled, but you should put Spanish - ISO2.
Where do you save it?
According to Ukelelexe2x80x99s User Manual, you have different choices (and I suggest your read section 3.3 of the manual). Short answer is within the Keyboard Layouts sub-folder of the Library folder in your home folder. This can be created if it doesnxe2x80x99t already exist. If you do that, only your user will see (and be able to use) this Layout.
After installing the keyboard layout and logging out and logging in again, open the International pane of System Preferences (Language & Text on Mac OS X 10.6 (Snow Leopard) and later). On the Input Menu (Input Sources in 10.6 or later) tab, your new keyboard layout should be listed there. Enjoy your faster IP Address typing.