Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM6SDP callsign genealogy
Currently held by Plank, Sybil A
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 KM6SDP's current licensee, walking backwards.
- Plank, Sybil ACAgranted 2011-02-04cancelled 2011-11-29
Successor callsigns
Callsigns held now by people who previously held KM6SDP.
No current licensee on record previously held this callsign.