Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4IOB callsign genealogy
Currently held by Cram, James 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 K4IOB's current licensee, walking backwards.
- Cram, James BGAgranted 2016-11-14cancelled 2017-03-20
Successor callsigns
Callsigns held now by people who previously held K4IOB.
- Cram, James BGAgranted 2018-06-12