Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4PPM callsign genealogy
Currently held by Robertson III, William B
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 KN4PPM's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KN4PPM.
- Robertson III, William BNCgranted 2019-07-23