Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AJ4IF callsign genealogy
Currently held by Umlas, Marc E
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 AJ4IF's current licensee, walking backwards.
- Umlas, Marc EFLgranted 2005-10-17cancelled 2008-05-16
Successor callsigns
Callsigns held now by people who previously held AJ4IF.
- UMLAS, MARC EFLgranted 2018-07-31