Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB4UG callsign genealogy
Currently held by ALGEO, JOHN 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 AB4UG's current licensee, walking backwards.
- Mah, EugeneSCgranted 2012-06-04cancelled 2012-11-06
Successor callsigns
Callsigns held now by people who previously held AB4UG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB4UG, oldest first.
- ALGEO, JOHN A KY1990-03-13 → cancelled 2002-03-14
- Mah, Eugene SC2022-08-24 active