9M2PJU APRS Passcode Generator
Instant APRS-IS callsign authentication calculator for amateur radio operators. Enter your callsign to generate your APRS passcode.
Instant APRS-IS callsign authentication calculator for amateur radio operators. Enter your callsign to generate your APRS passcode.
The APRS passcode generator uses a standardized algorithm to create a unique verification code based on your amateur radio callsign. Let's break down the process using the callsign "9M2PJU" as an example:
First, each character is converted to its ASCII value:
We start with a special hash value: 0x73E2 (29666 in decimal)
Fun fact: The value 73 is a CW (Morse code) abbreviation for "best regards" in amateur radio tradition!
The algorithm performs bitwise XOR operations on each character:
The final passcode will be a number between 0 and 32767.
This passcode remains constant for your callsign and is used for:
This passcode is required for amateur radio APRS authentication and remains constant for your callsign. It's used when configuring APRS devices or software to ensure proper authentication in the amateur radio APRS network.
Legal & Responsible Use Warning: This tool is provided for licensed amateur radio operators to obtain the passcode for their own callsign. APRS-IS passcodes authenticate access to shared infrastructure run by volunteers.
Do not use a passcode that does not belong to you, impersonate another operator, or transmit data under a callsign you are not authorized to use. Doing so may violate amateur radio regulations in your country (e.g. the ITU Radio Regulations, FCC Part 97 in the US, or your local licensing authority), APRS-IS acceptable use policies, and potentially computer-misuse laws. Consequences can include loss of operating privileges, account bans across APRS-IS servers, and legal action.
By using this generator you confirm that you are the holder of the callsign entered and that you will use the resulting passcode only for lawful amateur radio activity. The author assumes no responsibility for misuse.