Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4CPU callsign genealogy
Currently held by Ditmer, Steven
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 N4CPU's current licensee, walking backwards.
- Ditmer, SteveTNgranted 2005-07-18cancelled 2005-08-26
Successor callsigns
Callsigns held now by people who previously held N4CPU.
- TREADWAY, EDWARD MTNgranted 2002-12-31cancelled 2012-08-03
All historical holders
Every license row we've seen with the callsign N4CPU, oldest first.
- TREADWAY, EDWARD M TN1998-12-01 → cancelled 2002-12-31
- Ditmer, Steven AL2025-06-24 active