Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N6GMH callsign genealogy
Currently held by KNAPP, MARC W
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 N6GMH's current licensee, walking backwards.
- Henninger, Grant MCAgranted 2012-10-11cancelled 2015-01-17
Successor callsigns
Callsigns held now by people who previously held N6GMH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N6GMH, oldest first.
- KNAPP, MARC W CA1988-01-26 → cancelled 2000-01-27
- Henninger, Grant M CA2024-11-26 active