ARRL Numbered Radiogram
An ARRL Numbered Radiogram is a brevity code used in composing ARRL/RRI radiogram or radiogram-ICS213 messages during times of radio congestion.
The codes are used to transmit standard messages, sometimes with customized text, very quickly by experienced ARRL or RRI National Traffic System message traffic handlers.
In use, ARRL/RRI Numbered Radiogram Codes are messages encoded as one or two numbers. The numbers are always written down as words, and are always preceded by the procedural word "ARL". Throughout their transit via the Amateur radio National Traffic System, they retain this format and are only expanded to their plain-English meaning when delivered by a radio amateur. For example, "ARL FORTY SIX" would be typed in a letter or spoken over the phone to the addressee as "Greetings on your birthday and best wishes for many more to come." For those codes where customized text can be added, the customized text is added immediately following the number code word. For example, "ARL SIXTY TWO CHRISTMAS" is expanded upon delivery outside of the NTS System as "Greetings and best wishes to you for a pleasant Christmas holiday season."
The current list of numbered radiogram codes was expanded by Radio Relay International in 2024 and then adopted by the ARRL in 2025. It is backward compatible with older versions. The current list adds a variety of ARL Numbered Radiogram codes that support the RRI "I Am Safe" program along with additional texts designed to better support emergency communications operations and the RRI National Response Plan.