Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4SUM callsign genealogy
Currently held by Mudge, Corwin V
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 W4SUM's current licensee, walking backwards.
- Crawford, John WVAgranted 2019-04-26cancelled 2019-05-17
Successor callsigns
Callsigns held now by people who previously held W4SUM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4SUM, oldest first.
- Mudge, Corwin V PA2004-04-19 → cancelled 2016-06-18
- Crawford, John W VA2019-05-17 active