Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC4AH callsign genealogy
Currently held by ABERCROMBIE SR, KEITH A
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 AC4AH's current licensee, walking backwards.
- KN4OVno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held AC4AH.
No current licensee on record previously held this callsign.