Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM5NP callsign genealogy
Currently held by RIDDLE, THOMAS W
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 KM5NP's current licensee, walking backwards.
- Murphy, Mark JCAgranted 2022-07-28cancelled 2023-09-08
Successor callsigns
Callsigns held now by people who previously held KM5NP.
- RIDDLE, THOMAS WTXgranted 2018-12-06
All historical holders
Every license row we've seen with the callsign KM5NP, oldest first.
- Murphy, Mark J CA2023-09-08 active
- RIDDLE, THOMAS W— → cancelled 1999-02-26