Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W5MCU callsign genealogy
Currently held by Underkofler, Mark C
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 W5MCU's current licensee, walking backwards.
- Underkofler, Mark CTXgranted 2016-10-04cancelled 2016-10-22
Successor callsigns
Callsigns held now by people who previously held W5MCU.
No current licensee on record previously held this callsign.