Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1IMU 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 N1IMU's current licensee, walking backwards.
- Slack, Christopher CMAgranted 2007-04-26cancelled 2009-09-15
Successor callsigns
Callsigns held now by people who previously held N1IMU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1IMU, oldest first.
- SLACK, CHRISTOPHER C MA1991-02-26 → cancelled 2003-02-27
- Slack, Christopher C MA2019-07-03 active