Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1MFD callsign genealogy
Currently held by Marshall, Jeff P
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 N1MFD's current licensee, walking backwards.
- Marshall, Jeff PNHgranted 2009-05-08cancelled 2017-12-05
Successor callsigns
Callsigns held now by people who previously held N1MFD.
- ZAKRZEWSKI, JASON KCTgranted 2022-08-23
All historical holders
Every license row we've seen with the callsign N1MFD, oldest first.
- ZAKRZEWSKI, JASON K CT2012-04-20 → cancelled 2012-08-21
- Marshall, Jeff P NH2017-12-05 active