Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4EIO callsign genealogy
Currently held by Ulrich, Henry 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 WB4EIO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WB4EIO.
No current licensee on record previously held this callsign.