Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8SWL callsign genealogy
Currently held by HOSMER, DONALD M
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 W8SWL's current licensee, walking backwards.
- HOSMER, DONALD MMIgranted 2002-01-23cancelled 2005-09-16
Successor callsigns
Callsigns held now by people who previously held W8SWL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8SWL, oldest first.
- KNOTTS, FRED C WV1988-02-02 → cancelled 2000-02-03
- HOSMER, DONALD M MI2025-09-03 active