If it's a website search you don't need a space. Specialized keyboards often come up with different sites - I prefer it when common symbols (and .com) are on the keyboard when I'm asked for my e-mail address for instance.
You might find this useful then. If you have the web entry keyboard up and you want .net or .org etc, just hold down .com and a whole list of choices will pop up. Just slide your finger to the one you want and release.