Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MOD callsign genealogy
Currently held by LARSON, WILLIAM R
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 K9MOD's current licensee, walking backwards.
- Roop, Aaron DAZgranted 2013-09-10cancelled 2013-09-28
Successor callsigns
Callsigns held now by people who previously held K9MOD.
- Roop, Aaron DAZgranted 2013-11-19cancelled 2014-02-21
All historical holders
Every license row we've seen with the callsign K9MOD, oldest first.
- LARSON, WILLIAM R WI1994-04-05 → cancelled 2006-04-06
- Roop, Aaron D AZ2013-09-28 → cancelled 2013-11-19