Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1GRZ callsign genealogy
Currently held by Harrison Sr, Mark D
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 N1GRZ's current licensee, walking backwards.
- Harrison Sr, Mark DORgranted 2026-03-10
Successor callsigns
Callsigns held now by people who previously held N1GRZ.
- Harrison Sr, Mark DORgranted 2026-03-10
All historical holders
Every license row we've seen with the callsign N1GRZ, oldest first.
- JAKUBOWSKI, RICHARD A MA1999-03-22 → cancelled 2011-03-23
- Harrison Sr, Mark D OR2024-03-09 → cancelled 2026-03-10