SmartWhois is described as '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'. There are more than 10 alternatives to SmartWhois for a variety of platforms, including Online / Web-based, Windows, Linux, Mac and Android. The best alternative is WebCargo. It's not free, so if you're looking for a free alternative, you could try JsonWhois.io or WhoisAPI. Other great apps like SmartWhois are EZwhois (Free), ICANN WHOIS (Free), WhoisThisDomain (Free) and Bulk Whois API (Paid).
JsonWhois is the leading cloud hosted Whois API. The service serves WHOIS records for domains and IP addresses through a fully RESTful API. Additionally, the service offers IP geolocation and URL to screenshot services. Free usage per month!.
WhoisAPI is the premier provider of freshly parsed whois data for domain names and IP addresses, also providing IP to geolocation, HTML to PDF, and domain availability RESTful HTTP APIs. Billing is performed on a pay as you go basis, free monthly use.
Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, and top notch support. We support all TLDs including new gTLDs as well as IP addresses. Spend no more than necessary to get WHOIS data for your business.
Active Whois Browser is useful network information utility what allow finding information about owners of internet domains and IP adresses. Lookup country, persons and postal adresses of who use domain or IP address.