Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9SWL callsign genealogy
Currently held by Malone, John S
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 W9SWL's current licensee, walking backwards.
- Malone, John SINgranted 2024-01-20cancelled 2026-01-03
Successor callsigns
Callsigns held now by people who previously held W9SWL.
- Malone, John SINgranted 2024-01-20cancelled 2026-01-03
All historical holders
Every license row we've seen with the callsign W9SWL, oldest first.
- Ingersoll, John R WI2002-03-06 → cancelled 2005-08-04
- Malone, John S IN2017-12-30 → cancelled 2024-01-20
- Malone, John S IN2026-01-03 active