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KO4XX

Available2x2District 4

Competitive callsign — 5 applications filed with the FCC.

License HolderROBERTSON, JESSE

License ClassTechnician

Min. Class RequiredGeneral

LocationLEES SUMMIT, MO

Grant DateAug 11, 1992

Expiration DateAug 11, 2002

Cancellation DateAug 12, 2004

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KO4XX

Available2x2District 4

Competitive callsign — 5 applications filed with the FCC.

License HolderROBERTSON, JESSE

License ClassTechnician

Min. Class RequiredGeneral

LocationLEES SUMMIT, MO

Grant DateAug 11, 1992

Expiration DateAug 11, 2002

Cancellation DateAug 12, 2004

Available for ApplicationsAug 12, 2004

KO4XX is a highly sought-after 2x2 format amateur radio callsign. The license is currently held by ROBERTSON, JESSE in LEES SUMMIT, MO. This callsign has attracted significant interest in the amateur radio community, with 5 vanity applications filed with the FCC. The most recent was submitted by Hooper, Wade A on Jan 31, 2022. KO4XX has 1 recorded FCC license history event.

CW & Voice Analysis

Morse Code

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

CW Weight: 39 units(Moderate)

Voice Phonetics

Kilo Oscar Four X-ray X-ray

Readability: 8/10(High readability)

This callsign is available now

Requires General license or higher to apply for this callsign format (2x2).

License History

License ExpiredAug 12, 2004

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Hooper, Wade AFiled Jan 31, 2022
DismissedFCC ↗
Horvath, David PFiled Jan 7, 2021
DismissedFCC ↗
Horvath, David PFiled Oct 2, 2020
DismissedFCC ↗
BOWMAN, JOE DFiled Jul 13, 2009

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

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FCC data as of Jul 10, 2026

Not awarded

FCC ↗

Cohen, Jeffrey RFiled Jul 13, 2009

Not awardedFCC ↗

KO4XX FCC Vanity Status: 5 Competing Applications & History