Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1W callsign genealogy
Currently held by FLUMERFELT, LEONARD R
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 AB1W's current licensee, walking backwards.
- Karnap III, John RFLgranted 2025-01-07cancelled 2025-09-20
Successor callsigns
Callsigns held now by people who previously held AB1W.
- Wurmfeld, Benyamin ZCTgranted 2023-08-29
All historical holders
Every license row we've seen with the callsign AB1W, oldest first.
- FLUMERFELT, LEONARD R MA2010-12-01 → cancelled 2023-02-22
- Wurmfeld, Benyamin Z CT2023-03-13 → cancelled 2023-08-29
- Karnap III, John R FL2025-09-20 active