Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA4MRB callsign genealogy
Currently held by PASS, JAMES E
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 KA4MRB's current licensee, walking backwards.
- Pass, Jonathan WTNgranted 2018-11-27cancelled 2023-03-13
Successor callsigns
Callsigns held now by people who previously held KA4MRB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA4MRB, oldest first.
- PASS, JAMES E TN2011-07-19 → cancelled 2021-03-24
- Pass, Jonathan W TN2023-03-13 active