Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4CGS callsign genealogy
Currently held by Callahan, Seamus G
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 K4CGS's current licensee, walking backwards.
- Callahan, Seamus GNCgranted 2025-01-22cancelled 2025-04-15
Successor callsigns
Callsigns held now by people who previously held K4CGS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CGS, oldest first.
- COX JR, HOMER M SC2010-08-13 → cancelled 2022-10-25
- Callahan, Seamus G NC2025-04-15 active