Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9ATP callsign genealogy
Currently held by Swygman, Mark A
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 K9ATP's current licensee, walking backwards.
- Swygman, Mark AINgranted 2017-07-10cancelled 2017-07-29
Successor callsigns
Callsigns held now by people who previously held K9ATP.
No current licensee on record previously held this callsign.