Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NK0J callsign genealogy
Currently held by MC MULLEN, ROBERT S
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 NK0J's current licensee, walking backwards.
- LINDLEY, JOHN GPAgranted 2010-06-16cancelled 2011-05-10
Successor callsigns
Callsigns held now by people who previously held NK0J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NK0J, oldest first.
- MC MULLEN, ROBERT S MO1991-06-04 → cancelled 2003-06-05
- LINDLEY, JOHN G PA2021-11-11 active