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KN4JFB

Available2x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderSprenger, Sebastan

License ClassGeneral

Min. Class RequiredTechnician

LocationDavie, FL

Grant DateJan 29, 2018

Expiration DateJan 29, 2028

Cancellation DateFeb 17, 2018

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KN4JFB

Available2x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderSprenger, Sebastan

License ClassGeneral

Min. Class RequiredTechnician

LocationDavie, FL

Grant DateJan 29, 2018

Expiration DateJan 29, 2028

Cancellation DateFeb 17, 2018

Available for ApplicationsFeb 18, 2020

KN4JFB is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by Sprenger, Sebastan in Davie, FL. 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 Byrne, Joseph F on Oct 31, 2019. KN4JFB has 4 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 40 units(Moderate)

Voice Phonetics

Kilo November Four Juliet Foxtrot Bravo

Readability: 6.5/10(Good readability)

This callsign is available now

Requires Technician license or higher to apply for this callsign format (2x3).

License History

License CanceledFeb 17, 2018
License ModifiedJan 30, 2018
System-Generated GrantJan 29, 2018
License IssuedJan 29, 2018

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Byrne, Joseph FFiled Oct 31, 2019
Not awardedFCC ↗

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← KN4JFA KN4JFC →

FCC data as of Sep 12, 2026

KN4JFB FCC Vanity Status: 1 Competing Application & History