Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7DU callsign genealogy
Currently held by Shoffner, John P
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 W7DU's current licensee, walking backwards.
- Shoffner, John PTNgranted 2021-02-12cancelled 2026-03-27
Successor callsigns
Callsigns held now by people who previously held W7DU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W7DU, oldest first.
- SWAIN, CARROLL W WA2015-01-26 → cancelled 2026-03-10
- Shoffner, John P TN2026-03-27 active