Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9RPH callsign genealogy
Currently held by DERBIDGE, FERRIS
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 K9RPH's current licensee, walking backwards.
- DERBIDGE, FERRISUTgranted 2019-11-26cancelled 2019-12-20
Successor callsigns
Callsigns held now by people who previously held K9RPH.
No current licensee on record previously held this callsign.