Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AJ1O callsign genealogy
Currently held by Eisman, David O
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 AJ1O's current licensee, walking backwards.
- Eisman, David ONMgranted 2003-01-03cancelled 2007-11-24
Successor callsigns
Callsigns held now by people who previously held AJ1O.
No current licensee on record previously held this callsign.