Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4PMR callsign genealogy
Currently held by Erpenbach, Michael J
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 W4PMR's current licensee, walking backwards.
- Erpenbach, Michael JSCgranted 2020-05-21cancelled 2020-06-09
Successor callsigns
Callsigns held now by people who previously held W4PMR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4PMR, oldest first.
- Greene, Conrad L CA2005-09-16 → cancelled 2017-11-25
- Erpenbach, Michael J SC2020-06-09 active