Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4COL callsign genealogy
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 WD4COL'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 WD4COL.
- MAC DONALD, JOHN RGAgranted 2019-01-31