Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0OK callsign genealogy
Currently held by Constable, Dewite J
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 W0OK's current licensee, walking backwards.
- Seffens, DanielCOgranted 2021-01-19cancelled 2021-05-07
Successor callsigns
Callsigns held now by people who previously held W0OK.
- ENGELBRECHT, PHILLIP DMOgranted 2019-04-16
All historical holders
Every license row we've seen with the callsign W0OK, oldest first.
- KOELSCH, C FREDERICK MN1994-07-15 → cancelled 1999-12-24
- Constable, Dewite J KS2006-03-21 → cancelled 2018-03-22
- ENGELBRECHT, PHILLIP D MO2018-04-10 → cancelled 2019-04-16
- Seffens, Daniel CO2021-05-07 active