Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AJ4SB callsign genealogy
Currently held by Frailing, Robert 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 AJ4SB's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AJ4SB.
No current licensee on record previously held this callsign.