Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4IUM callsign genealogy
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 N4IUM'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 N4IUM.
- WHIPPLE SR, RICHARD EFLgranted 2014-01-03cancelled 2026-03-31