Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NF4E callsign genealogy
Currently held by Tharp, Michael J
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 NF4E's current licensee, walking backwards.
- Tharp, Michael JNCgranted 2015-06-23cancelled 2015-09-19
Successor callsigns
Callsigns held now by people who previously held NF4E.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NF4E, oldest first.
- KOSBAB, F PAUL OK2003-08-22 → cancelled 2015-09-01
- Tharp, Michael J NC2025-08-26 active