Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4SB callsign genealogy
Currently held by Borden, Michael 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 AD4SB's current licensee, walking backwards.
- Borden, Michael SALgranted 2011-06-06cancelled 2011-11-18
Successor callsigns
Callsigns held now by people who previously held AD4SB.
- ROURKE, ROBERT JVAgranted 2016-09-14