Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4XP callsign genealogy
Currently held by Slack, Christopher 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 AI4XP's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held AI4XP.
- Slack, Christopher CMAgranted 2019-07-03