Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0RLS callsign genealogy
Currently held by MOMMERTZ, WILLIAM C
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 W0RLS's current licensee, walking backwards.
- Sluder, Richard LFLgranted 2015-06-12cancelled 2015-10-02
Successor callsigns
Callsigns held now by people who previously held W0RLS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0RLS, oldest first.
- MOMMERTZ, WILLIAM C MO1998-11-20 → cancelled 2010-11-23
- Sluder, Richard L FL2025-07-08 active