Use WhoIs lookup anytime you want to perform a search to see who owns a domain name, how many pages from a site are listed with Google or even search WhoIs address listings for a website's owner.
The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
No, presidents, partners, and founders are not capitalized in your sentence. In general, titles (offices, ranks, etc.) are capitalized only when they occur immediately prior to a personal name. There are a few exceptions to this rule. The Chicago Manual of Style says In promotional or ceremonial contexts such as a displayed list of donors in the front matter of a nook or a list of corporate officers in an annual report, titles are usually capitalized even when following a personal name.