Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4CMK callsign genealogy
Currently held by EISENSTEIN, MARTIN
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 W4CMK's current licensee, walking backwards.
- Henderson, Edward LGAgranted 2003-10-08cancelled 2008-05-06
Successor callsigns
Callsigns held now by people who previously held W4CMK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4CMK, oldest first.
- EISENSTEIN, MARTIN FL1993-03-30 → cancelled 2005-03-31
- Henderson, Edward L GA2018-03-01 active