Logbook of The World
Logbook of The World

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Information for Application Developers

The ARRL’s Logbook of the World (LoTW) is an online service that enables Radio Amateurs to confirm their two-way contacts, and submit these confirmations for credit toward various awards. Each QSO submitted to LoTW must specify the location from which it was made, and must be included in a log file that is digitally signed with a Callsign Certificate issued by the ARRL. LoTW provides web services that accept digitally-signed files, report the acceptance of submitted QSOs, and report the confirmation of submitted QSOs.

Developers interested in integrating their applications with LoTW are encouraged to join the LoTW Development Mailing List via lotw-devel@reflector.arrl.org