Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF5MDZ callsign genealogy
Currently held by Callahan, 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 KF5MDZ's current licensee, walking backwards.
- Callahan, Christopher CTXgranted 2015-02-14cancelled 2016-09-13
Successor callsigns
Callsigns held now by people who previously held KF5MDZ.
- Callahan, Christopher CTXgranted 2015-02-14cancelled 2016-09-13
All historical holders
Every license row we've seen with the callsign KF5MDZ, oldest first.
- Callahan, Christopher C TX2011-07-29 → cancelled 2015-02-14
- Callahan, Christopher C TX2026-08-08 active