KF4DUR
Cancelled2x3
License HolderCASTILLO, RENE R
License ClassAdvanced
Min. Class RequiredTechnician
Requires Technician license or higher to apply for this callsign format (2x3).
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications detected. Monitor the FCC ULS application search to verify before filing.