Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W5YPK callsign genealogy
Currently held by Osterman, Keith 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 W5YPK's current licensee, walking backwards.
- Osterman, Keith LARgranted 2008-12-22cancelled 2009-06-02
Successor callsigns
Callsigns held now by people who previously held W5YPK.
- OSTERMAN, KEITH LMOgranted 2025-11-22