Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4LAK callsign genealogy
Currently held by SINK, JOHN B
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 N4LAK's current licensee, walking backwards.
- KIELASA, LAWRENCE AFLgranted 2007-10-22cancelled 2016-08-23
Successor callsigns
Callsigns held now by people who previously held N4LAK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4LAK, oldest first.
- SINK, JOHN B NC2002-12-18 → cancelled 2015-01-21
- KIELASA, LAWRENCE A MI2026-06-23 active