The National traffic System (NTS) has served as a backbone network for the relay and, ultimately, delivery of text-based messages across the United States and beyond by amateur radio. Organized by the American Radio Relay League (ARRL) in 1914, the NTS is purposed with the efficient and accurate delivery of message traffic following the Radiogram format. Collected within this category is a listing of websites devoted to the networks. Whether VHF (local) or HF (state-wide and regional), these affiliations of traffic handlers are responsible for ensuring the timely and reliable relay and delivery of hundreds to thousands of messages each day.