Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1EIO callsign genealogy
Currently held by McDonald, WILLIAM S
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 K1EIO's current licensee, walking backwards.
- McDonald, WILLIAM SMAgranted 2023-01-24cancelled 2026-02-03
Successor callsigns
Callsigns held now by people who previously held K1EIO.
No current licensee on record previously held this callsign.