Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB9TCM callsign genealogy
Currently held by Colburn, Alan
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 WB9TCM's current licensee, walking backwards.
- Colburn, AlanCAgranted 2015-08-28cancelled 2015-09-24
Successor callsigns
Callsigns held now by people who previously held WB9TCM.
No current licensee on record previously held this callsign.