Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4TNO callsign genealogy
Currently held by CALLAHAN, GARY M
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 K4TNO's current licensee, walking backwards.
- CALLAHAN, GARY MTNgranted 2007-02-14cancelled 2008-04-26
Successor callsigns
Callsigns held now by people who previously held K4TNO.
No current licensee on record previously held this callsign.