Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SYL callsign genealogy
Currently held by Friedman, Marc D
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 K4SYL's current licensee, walking backwards.
- Friedman, Marc DGAgranted 2021-04-09cancelled 2022-01-07
Successor callsigns
Callsigns held now by people who previously held K4SYL.
- Friedman, Marc DGAgranted 2022-10-18