Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W8HUM callsign genealogy
Currently held by Hummer, Michael 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 W8HUM's current licensee, walking backwards.
- Hummer, Michael JOHgranted 2009-08-06cancelled 2014-08-22
Successor callsigns
Callsigns held now by people who previously held W8HUM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8HUM, oldest first.
- TYBORSKY, ROBERT J WV1995-02-15 → cancelled 2007-02-16
- Hummer, Michael J OH2025-09-09 active