Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4IP callsign genealogy
Currently held by AUERBACH, GREGORY B
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 K4IP's current licensee, walking backwards.
- AUERBACH, GREGORY BKSgranted 2004-03-10cancelled 2009-11-10
Successor callsigns
Callsigns held now by people who previously held K4IP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4IP, oldest first.
- Swift Jr, Frederick J FL2005-01-13 → cancelled 2007-09-10
- AUERBACH, GREGORY B IL2019-09-13 active