Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KI4RDB callsign genealogy
Currently held by Babcock, Matthew 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 KI4RDB's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KI4RDB.
- Babcock, Matthew DNCgranted 2017-08-01