Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5ZAP callsign genealogy
Currently held by MARTIN, CHRISTOPHER C
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 K5ZAP's current licensee, walking backwards.
- Mills, Tommy WTXgranted 2020-01-24cancelled 2020-02-11
Successor callsigns
Callsigns held now by people who previously held K5ZAP.
- MARTIN, CHRISTOPHER CTXgranted 2004-02-10cancelled 2006-01-10
All historical holders
Every license row we've seen with the callsign K5ZAP, oldest first.
- MARTIN, CHRISTOPHER C AZ1998-03-03 → cancelled 2004-02-10
- MARTIN, CHRISTOPHER C AZ2006-01-10 → cancelled 2018-01-11
- Mills, Tommy W TX2020-02-11 active