Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4MUK callsign genealogy
Currently held by Williams, James A
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 K4MUK's current licensee, walking backwards.
- KC4HOVcancelledcancelled 1999-01-28
Successor callsigns
Callsigns held now by people who previously held K4MUK.
- Williams, James ATNgranted 2016-11-15