Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9JOB callsign genealogy
Currently held by O'Brien, John T
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 K9JOB's current licensee, walking backwards.
- O'Brien, John TWIgranted 2008-11-17cancelled 2008-12-09
Successor callsigns
Callsigns held now by people who previously held K9JOB.
No current licensee on record previously held this callsign.