Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4CDK callsign genealogy
Currently held by MARTIN, GRANT G
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by WB4CDK's current licensee, walking backwards.
- KOHLMEYER, CHARLES DTNgranted 2015-03-20cancelled 2015-05-09
Successor callsigns
Callsigns held now by people who previously held WB4CDK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4CDK, oldest first.
- MARTIN, GRANT G FL1992-11-10 → cancelled 2004-11-11
- KOHLMEYER, CHARLES D TN2025-03-04 active