Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4UP callsign genealogy
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 K4UP's current licensee, walking backwards.
- KG4GBEcancelledCastalia Island DX AssociationNCgranted 2000-01-21cancelled 2000-02-15
Successor callsigns
Callsigns held now by people who previously held K4UP.
- HARNEY, WILLIAM CSCgranted 1998-01-23cancelled 2000-12-22
All historical holders
Every license row we've seen with the callsign K4UP, oldest first.
- Castalia Island DX Association NC2020-01-28 active
- —— → cancelled 1998-01-23