Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR4MER callsign genealogy
Currently held by NICOLSON, DOUGLAS J
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 KR4MER's current licensee, walking backwards.
- KRAMER, GUY VNYgranted 2007-05-23cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held KR4MER.
- NICOLSON, DOUGLAS JCAgranted 2001-08-24cancelled 2013-08-27
All historical holders
Every license row we've seen with the callsign KR4MER, oldest first.
- NICOLSON, DOUGLAS J CA2001-08-24 → cancelled 2009-03-26
- KRAMER, GUY V NY2025-09-27 active