Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ZOO callsign genealogy
Currently held by Miller, Mark A
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 N4ZOO's current licensee, walking backwards.
- Miller, Mark AALgranted 2018-07-24cancelled 2024-03-05
Successor callsigns
Callsigns held now by people who previously held N4ZOO.
- Hill, Joseph GKYgranted 2018-11-24
All historical holders
Every license row we've seen with the callsign N4ZOO, oldest first.
- SHREWSBURY, OLAND K TN2002-02-26 → cancelled 2014-05-28
- Hill, Joseph G KY2015-12-29 → cancelled 2018-11-24
- Miller, Mark A AL2024-03-05 active