Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4MRK callsign genealogy
Currently held by SLEMP, MARK A
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 N4MRK's current licensee, walking backwards.
- SLEMP, MARK ATNgranted 2015-03-23cancelled 2020-03-21
Successor callsigns
Callsigns held now by people who previously held N4MRK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4MRK, oldest first.
- ADAMS, JOHN G FL2005-05-17 → cancelled 2017-06-09
- SLEMP, MARK A TN2020-03-21 active