Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9AJM callsign genealogy
Currently held by MUELLER, ANDREW 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 W9AJM's current licensee, walking backwards.
- MUELLER, ANDREW JWIgranted 2005-07-30cancelled 2008-10-21
Successor callsigns
Callsigns held now by people who previously held W9AJM.
- MUELLER, ANDREW JWIgranted 2026-05-02
All historical holders
Every license row we've seen with the callsign W9AJM, oldest first.
- CROWLEY, WILLIAM J IL1996-04-05 → cancelled 2008-04-08
- MUELLER, ANDREW J WI2008-10-21 → cancelled 2016-06-18