Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NG4J callsign genealogy
Currently held by Guppenberger, James C
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 NG4J's current licensee, walking backwards.
- Guppenberger, James CFLgranted 2017-06-28cancelled 2017-10-11
Successor callsigns
Callsigns held now by people who previously held NG4J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NG4J, oldest first.
- TEFFETELLER, JUANITA H TN2005-06-22 → cancelled 2017-09-21
- Guppenberger, James C FL2017-10-11 active