Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM5COS callsign genealogy
Currently held by Meckler, Mark
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 KM5COS's current licensee, walking backwards.
- Meckler, MarkTXgranted 2024-04-17cancelled 2024-05-24
Successor callsigns
Callsigns held now by people who previously held KM5COS.
No current licensee on record previously held this callsign.