Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JAM callsign genealogy
Currently held by MANN SR, JOHN A
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 W4JAM's current licensee, walking backwards.
- ACOSTA, JAIMEFLgranted 2022-09-28cancelled 2022-10-18
Successor callsigns
Callsigns held now by people who previously held W4JAM.
- MANN SR, JOHN AVAgranted 2020-05-12
All historical holders
Every license row we've seen with the callsign W4JAM, oldest first.
- MANN SR, JOHN A VA2017-07-10 → cancelled 2020-05-12
- ACOSTA, JAIME FL2022-10-18 active