Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8CTB callsign genealogy
Currently held by HARTMAN, DONALD P
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 W8CTB's current licensee, walking backwards.
- BISHOP, CHARLES TOHgranted 2010-11-30cancelled 2011-05-10
Successor callsigns
Callsigns held now by people who previously held W8CTB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8CTB, oldest first.
- HARTMAN, DONALD P MI1994-04-12 → cancelled 2006-04-14
- BISHOP, CHARLES T OH2021-02-24 active