Wikipedia
QRZ.com is an Amateur radio Callsign (radio) website, which houses almost every callsign in the world. Founded by FRED L LLOYD in 1992, a huge amount of effort was put in to work with the FCC database, to create a CD-ROM with all callsigns issued. The company now runs a website, containing almost every callsign in the world, and the CD-ROM is carried on board the International Space Station, and Russian Mir space stations. It is one of the most recognized websites for amateur radio enthusiasts. Information is pulled directly from the FCC database, and from databases of other nations if these databases are online. In addition to the information pulled from government databases, users are allowed to edit entries for accuracy and currency.