Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1KOJ callsign genealogy
Currently held by JOSLIN, 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 W1KOJ's current licensee, walking backwards.
- JOSLIN, MARK ACOgranted 2011-06-30cancelled 2019-04-30
- KA3VWOno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held W1KOJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1KOJ, oldest first.
- Joslin Sr, Frederick R CT2007-11-05 → cancelled 2019-02-25
- JOSLIN, MARK A CO2019-04-30 active