Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC5MMK callsign genealogy
Currently held by Seil, Chris
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 KC5MMK's current licensee, walking backwards.
- Seil, ChrisTXgranted 2020-02-25cancelled 2020-04-30
Successor callsigns
Callsigns held now by people who previously held KC5MMK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC5MMK, oldest first.
- SEIL, CHRIS TX2005-03-22 → cancelled 2017-03-24
- Seil, Chris TX2020-04-30 active