Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4TL callsign genealogy
Currently held by BYRD, JOHN T
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 KO4TL's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KO4TL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4TL, oldest first.
- BYRD, JOHN T NC2002-05-23 → cancelled 2014-08-12
- Mendez, Joshua S OR2023-03-04 active