Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4CRU callsign genealogy
Currently held by OLENDER, MARK H
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 K4CRU's current licensee, walking backwards.
- OLENDER, MARK HFLgranted 2017-11-02cancelled 2017-11-21
Successor callsigns
Callsigns held now by people who previously held K4CRU.
No current licensee on record previously held this callsign.