Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MAS callsign genealogy
Currently held by KANE, SHELDON E
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 K4MAS's current licensee, walking backwards.
- Shafer, Michael ANMgranted 2017-06-20cancelled 2017-12-22
Successor callsigns
Callsigns held now by people who previously held K4MAS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MAS, oldest first.
- KANE, SHELDON E FL2005-02-24 → cancelled 2014-08-29
- Shafer, Michael A NM2017-12-22 active