Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NN4OO callsign genealogy
Currently held by Guhl, Philip E
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 NN4OO's current licensee, walking backwards.
- Guhl, Philip EGAgranted 2016-06-20cancelled 2025-04-11
Successor callsigns
Callsigns held now by people who previously held NN4OO.
- Mc Kee, John RNCgranted 2019-04-05cancelled 2022-02-19
All historical holders
Every license row we've seen with the callsign NN4OO, oldest first.
- Mc Kee, John R NC2017-05-26 → cancelled 2019-04-05
- Guhl, Philip E GA2025-04-11 active