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KS4SK

Active2x2District 4

Competitive callsign — 1 application filed with the FCC.

License HolderKauffman, Simon D

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationToledo, OH

Grant DateJul 31, 2020

Expiration DateJul 31, 2030

KS4SK is a highly sought-after 2x2 format amateur radio callsign. The license is currently held by Kauffman, Simon D in Toledo, OH. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by Kauffman, Simon D on Jul 13, 2020. KS4SK has 6 recorded FCC license history events.

CW & Voice Analysis

Morse Code

-.- ... ....- ... -.-

CW Weight: 27 units(Light (fast to send))

Voice Phonetics

Kilo Sierra Four Sierra Kilo

Readability: 7/10(Good readability)

License History

Administrative Update AppliedJul 7, 2026
Administrative Update AppliedApr 7, 2023
License IssuedJul 31, 2020
Vanity Callsign GrantedJul 31, 2020
License ExpiredJul 16, 2016
Tax ID (TIN) AddedMay 12, 2004

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Kauffman, Simon DFiled Jul 13, 2020
Not awardedFCC ↗

Search external databases

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FCC data as of Sep 12, 2026 — may be delayed

KS4SK FCC Vanity Status: 1 Competing Application & History