Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1HHH callsign genealogy
Currently held by Isayev, Mark
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 K1HHH's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K1HHH.
No current licensee on record previously held this callsign.