Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SOB callsign genealogy
Currently held by RICHARDSON II, ROBERT D
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 K4SOB's current licensee, walking backwards.
- RICHARDSON, BobTNgranted 2024-11-15cancelled 2025-02-04
Successor callsigns
Callsigns held now by people who previously held K4SOB.
- RICHARDSON, BobTNgranted 2024-11-15cancelled 2025-02-04
All historical holders
Every license row we've seen with the callsign K4SOB, oldest first.
- COLLINS, TOM W FL2009-06-13 → cancelled 2021-06-04
- RICHARDSON II, ROBERT D TN2021-07-30 → cancelled 2024-11-15
- RICHARDSON, Bob TN2025-02-04 active