Domain and IP checking on employment is made for getting more information about the domain e.g., if it has an owner. If it does, the checking apps and services will show you some contact details, that were specified when registering a domain.
The Information about the employment provide all domain hostings, but, as a rule, they only indicate the fact of employment, and provide no information about the owner. Therefore it is better to use online services WhoIs, or special software such as represented at this page.
SEO Site Analysis: Site-Reporter Free
A multifunctional optimizer and web masters's assistant for the site and project promotion and management. It shows statistics and exports it to different file types.