Confidence: Medium · Source: FCC ULS · As of 2026-09-09
K9SQL callsign genealogy
Currently held by Poortinga, Robert P
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 K9SQL's current licensee, walking backwards.
- Steiner, Gregory AKYgranted 2014-07-21cancelled 2018-03-13
Successor callsigns
Callsigns held now by people who previously held K9SQL.
- Poortinga, Robert PINgranted 2013-03-26cancelled 2018-11-24
All historical holders
Every license row we've seen with the callsign K9SQL, oldest first.
- Poortinga, Robert P IN2003-04-29 → cancelled 2013-03-26
- Steiner, Gregory A KY2018-03-13 active