nNetis provides a database of tennis courts, tennis clubs, and tennis shops around the country. The data is presented in map form with details including, number of courts at the location, if the courts have lights, if it is indoor, what type of court it is, if the location has a pro shop and what services the shop offers. The nNetis Tennis Database API enables users to utilize the facility database on third-party websites. Examples usages include adding a search box to find local courts or adding a localized facility map. The API is JSON based and free of charge within reasonable usage limits.