Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6RTT callsign genealogy
Currently held by Cobbler IV, Robert L
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 K6RTT's current licensee, walking backwards.
- Cobbler IV, Robert LCAgranted 2018-08-17cancelled 2018-09-07
Successor callsigns
Callsigns held now by people who previously held K6RTT.
- WALKER, JAMES JORgranted 2012-03-10cancelled 2024-03-12
All historical holders
Every license row we've seen with the callsign K6RTT, oldest first.
- WALKER, JAMES J OR2009-03-27 → cancelled 2012-03-10
- Cobbler IV, Robert L MT2018-09-07 active