Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4HLM callsign genealogy
Currently held by KELLER, BERT B
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 N4HLM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N4HLM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4HLM, oldest first.
- KELLER, BERT B NC1988-11-15 → cancelled 2000-11-16
- Hall, Mark R AL2020-05-22 active