Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4UUM callsign genealogy
Currently held by SHAPIRO, ROBERT I
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 KM4UUM's current licensee, walking backwards.
- SHAPIRO, ROBERT IVAgranted 2013-04-11cancelled 2016-06-21
Successor callsigns
Callsigns held now by people who previously held KM4UUM.
- SHAPIRO, ROBERT INJgranted 2023-07-11