Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4LTT callsign genealogy
Currently held by Diaz, Charles
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 W4LTT's current licensee, walking backwards.
- Diaz, CharlesFLgranted 2017-08-01cancelled 2017-08-19
Successor callsigns
Callsigns held now by people who previously held W4LTT.
- STERN, JOSEPH KFLgranted 2021-11-02
All historical holders
Every license row we've seen with the callsign W4LTT, oldest first.
- STERN, JOSEPH K FL2011-12-08 → cancelled 2012-01-06
- Diaz, Charles FL2017-08-19 active