Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4WPM callsign genealogy
Currently held by MANSFIELD, WILLIAM 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 KM4WPM's current licensee, walking backwards.
- Mansfield, William PGAgranted 2016-02-22cancelled 2016-03-15
Successor callsigns
Callsigns held now by people who previously held KM4WPM.
- MANSFIELD, WILLIAMGAgranted 2026-06-25