Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4UPS callsign genealogy
Currently held by JOHNSTON, DAVID 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 W4UPS's current licensee, walking backwards.
- JOHNSTON, DAVID MGAgranted 1992-08-04cancelled 1999-12-31
Successor callsigns
Callsigns held now by people who previously held W4UPS.
No current licensee on record previously held this callsign.