Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GPU callsign genealogy
Currently held by Chmielewski, Marc S
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 K4GPU's current licensee, walking backwards.
- Chmielewski, Marc SNCgranted 2026-07-31cancelled 2026-08-18
Successor callsigns
Callsigns held now by people who previously held K4GPU.
No current licensee on record previously held this callsign.