Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4WSM callsign genealogy
Currently held by HAIRSTON, WILLIAM W
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 K4WSM's current licensee, walking backwards.
- Moore IV, William SFLgranted 2006-06-08cancelled 2006-06-30
Successor callsigns
Callsigns held now by people who previously held K4WSM.
- Hairston, William WTNgranted 2022-07-12
All historical holders
Every license row we've seen with the callsign K4WSM, oldest first.
- HAIRSTON, WILLIAM W TN2001-10-27 → cancelled 2002-09-10
- Moore IV, William S FL2026-04-07 active