Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4MKM callsign genealogy
Currently held by McLamb, Michael K
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 N4MKM's current licensee, walking backwards.
- McLamb, Michael KNCgranted 2021-08-23cancelled 2022-02-15
Successor callsigns
Callsigns held now by people who previously held N4MKM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4MKM, oldest first.
- CROTTY, BARBARA W KY2005-12-21 → cancelled 2017-08-02
- McLamb, Michael K NC2022-02-15 active