Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1ULM callsign genealogy
Currently held by ARMSTRONG, ANDREW T
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 N1ULM's current licensee, walking backwards.
- ARMSTRONG, ANDREW TMEgranted 2008-11-11cancelled 2008-12-16
Successor callsigns
Callsigns held now by people who previously held N1ULM.
- ARMSTRONG, ANDREW TMEgranted 2008-11-11cancelled 2008-12-16
All historical holders
Every license row we've seen with the callsign N1ULM, oldest first.
- ARMSTRONG, ANDREW T ME2018-10-10 active
- ARMSTRONG, ANDREW T— → cancelled 1999-01-07