Confidence: Medium · Source: FCC ULS · As of 2026-09-15
K4TOS callsign genealogy
Currently held by Harper, Glenn H
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 K4TOS's current licensee, walking backwards.
- Harper, Glenn HGAgranted 2014-05-01cancelled 2014-07-08
Successor callsigns
Callsigns held now by people who previously held K4TOS.
No current licensee on record previously held this callsign.