Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK7SX callsign genealogy
Currently held by JOHNSTON, MARK D
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 KK7SX's current licensee, walking backwards.
- Swann, Roger CWAgranted 2014-04-22cancelled 2020-04-17
Successor callsigns
Callsigns held now by people who previously held KK7SX.
- JOHNSTON, MARK DAZgranted 2018-01-11
All historical holders
Every license row we've seen with the callsign KK7SX, oldest first.
- Swann, Roger C WA2020-04-17 active
- JOHNSTON, MARK D— → cancelled 1999-05-13