Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0CWR callsign genealogy
Currently held by Mohr, John W
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 K0CWR's current licensee, walking backwards.
- Mohr, John WMOgranted 2011-09-07cancelled 2014-11-11
Successor callsigns
Callsigns held now by people who previously held K0CWR.
- Guerino, Michael PMAgranted 2021-08-03
All historical holders
Every license row we've seen with the callsign K0CWR, oldest first.
- Guerino, Michael P NE2008-08-22 → cancelled 2011-08-23
- Mohr, John W MO2014-11-11 active