Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9CRP callsign genealogy
Currently held by WITHROW, WILLIAM R
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 K9CRP's current licensee, walking backwards.
- OBSUNA, MARLON MCAgranted 2005-08-31cancelled 2009-07-28
Successor callsigns
Callsigns held now by people who previously held K9CRP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9CRP, oldest first.
- WITHROW, WILLIAM R AR1993-04-27 → cancelled 2005-04-28
- OBSUNA, MARLON M NV2019-07-03 active