Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SIB callsign genealogy
Currently held by Sibley, Forrest K
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 N4SIB's current licensee, walking backwards.
- Sibley, Forrest KGAgranted 2016-08-03cancelled 2020-03-07
Successor callsigns
Callsigns held now by people who previously held N4SIB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SIB, oldest first.
- TWITTY, GEORGE L GA1988-03-15 → cancelled 2000-03-16
- Sibley, Forrest K GA2020-03-07 active