Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4KOS callsign genealogy
Currently held by O Sullivan, Kevin J
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 W4KOS's current licensee, walking backwards.
- O Sullivan, Kevin JGAgranted 2018-02-22cancelled 2018-03-13
Successor callsigns
Callsigns held now by people who previously held W4KOS.
No current licensee on record previously held this callsign.