Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4MMO callsign genealogy
Currently held by Rolfson, Thomas P
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 W4MMO's current licensee, walking backwards.
- Rolfson, ThomasWIgranted 2021-04-02cancelled 2021-04-20
Successor callsigns
Callsigns held now by people who previously held W4MMO.
No current licensee on record previously held this callsign.