Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N0UMW callsign genealogy
Currently held by HOLTHAUS, GRANT M
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 N0UMW's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held N0UMW.
- HOLTHAUS, GRANT MKSgranted 2012-02-16cancelled 2016-03-04