File Size: 9.9 MB SmartWhois is a useful network information utility that allows you to look up all the available information about an IP address, hostname or domain, including country, state or province, city, name of the network provider, administrator and technical support contact information. It helps you find answers to these important questions: Who is the owner of the domain? When was the domain registered and what is the owner's contact information? Who is the owner of the IP address block?