Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5JMS callsign genealogy
Currently held by Piker, John F
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 K5JMS's current licensee, walking backwards.
- Sullivan, John MOHgranted 2017-01-25cancelled 2021-03-12
Successor callsigns
Callsigns held now by people who previously held K5JMS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5JMS, oldest first.
- Piker, John F LA2008-12-05 → cancelled 2021-02-11
- Sullivan, John M OH2021-03-12 active