Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4PM callsign genealogy
Currently held by ABERCROMBIE, ROBERT P
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 AI4PM's current licensee, walking backwards.
- ABERCROMBIE, ROBERT PSCgranted 2005-10-03cancelled 2006-05-08
Successor callsigns
Callsigns held now by people who previously held AI4PM.
No current licensee on record previously held this callsign.