Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9SLN callsign genealogy
Currently held by Niemann, Shawn L
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 W9SLN's current licensee, walking backwards.
- Niemann, Shawn LWIgranted 2023-08-15cancelled 2023-09-06
Successor callsigns
Callsigns held now by people who previously held W9SLN.
- Niemann, Shawn LWIgranted 2023-08-15cancelled 2023-09-06
All historical holders
Every license row we've seen with the callsign W9SLN, oldest first.
- Niemann, Shawn L WI2017-06-17 → cancelled 2023-08-15
- Niemann, Shawn L WI2023-09-06 active