Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1ATC callsign genealogy
Currently held by MUSTARD, MARK S
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 K1ATC's current licensee, walking backwards.
- MUSTARD, MARK STNgranted 2000-02-03cancelled 2007-03-27
- KC4OQUno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held K1ATC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1ATC, oldest first.
- TAYLOR, JOHN H NH1994-06-21 → cancelled 2002-03-07
- MUSTARD, MARK S TN2017-02-15 active