Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FFS callsign genealogy
Currently held by Oberdorfer, Martha L
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 K4FFS's current licensee, walking backwards.
- Oberdorfer, Martha LFLgranted 2021-09-15cancelled 2021-10-05
Successor callsigns
Callsigns held now by people who previously held K4FFS.
No current licensee on record previously held this callsign.