Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W5QMP callsign genealogy
Currently held by Garthoeffner Jr, William C
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 W5QMP's current licensee, walking backwards.
- GRESHAM, PHILIP DNCgranted 2020-03-17cancelled 2020-06-30
Successor callsigns
Callsigns held now by people who previously held W5QMP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W5QMP, oldest first.
- Garthoeffner Jr, William C OK2014-03-11 → cancelled 2020-05-08
- GRESHAM, PHILIP D MO2020-06-30 active