Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N3UDR callsign genealogy
Currently held by Swarm, William A
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 N3UDR's current licensee, walking backwards.
- Swarm, William APAgranted 2018-08-28cancelled 2019-11-15
Successor callsigns
Callsigns held now by people who previously held N3UDR.
No current licensee on record previously held this callsign.