Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AJ4CQ callsign genealogy
Currently held by BLACKWELL, JOHN R
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 AJ4CQ's current licensee, walking backwards.
- BLACKWELL, JOHN RNCgranted 2007-03-19cancelled 2007-10-15
Successor callsigns
Callsigns held now by people who previously held AJ4CQ.
No current licensee on record previously held this callsign.