Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KU4UQ callsign genealogy
Currently held by Cosgrove, Mark 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 KU4UQ's current licensee, walking backwards.
- KE4RXYcancelledcancelled 1998-09-11
Successor callsigns
Callsigns held now by people who previously held KU4UQ.
No current licensee on record previously held this callsign.