Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5ATR callsign genealogy
Currently held by Underbrink, Joseph C
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 K5ATR's current licensee, walking backwards.
- Underbrink, Joseph CTXgranted 2024-05-07cancelled 2024-06-08
Successor callsigns
Callsigns held now by people who previously held K5ATR.
No current licensee on record previously held this callsign.