QRZ.com

QRZ.com is an online database and community platform for amateur radio enthusiasts, known as ham radio operators. It allows users to look up information about radio call signs, such as the license holder’s name, location, and license class. The site also provides forums, news, and tools for radio hobbyists to connect, share experiences, and access technical resources. Essentially, it's a comprehensive hub for tracking and communicating within the amateur radio community, helping operators verify identities and exchange information efficiently and securely.