Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SDZ callsign genealogy
Currently held by POLLACK, BEN H
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 K4SDZ's current licensee, walking backwards.
- Smith, Zachary DVAgranted 2015-12-14cancelled 2016-02-06
Successor callsigns
Callsigns held now by people who previously held K4SDZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SDZ, oldest first.
- POLLACK, BEN H FL1993-03-23 → cancelled 2005-03-24
- Smith, Zachary D VA2016-02-06 active