Confidence: Medium · Source: FCC ULS · As of 2026-09-12
ND4H callsign genealogy
Currently held by HOLTHAUS, BILL 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 ND4H's current licensee, walking backwards.
- Butler, David LFLgranted 2019-10-22cancelled 2020-02-14
Successor callsigns
Callsigns held now by people who previously held ND4H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign ND4H, oldest first.
- HOLTHAUS, BILL L CA2000-05-30 → cancelled 2012-05-31
- FOLK JR, JESSE C SC2012-06-19 → cancelled 2018-01-26
- Butler, David L OH2020-02-14 active