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KO4UBJ

Available2x3District 4

No competing applications on record.

License HolderMikkelsen, Donald J

License ClassAmateur Extra

Min. Class RequiredTechnician

LocationHerndon, VA

Grant DateOct 15, 2021

Expiration DateOct 15, 2031

Cancellation DateFeb 15, 2022

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KO4UBJ

Available2x3District 4

No competing applications on record.

License HolderMikkelsen, Donald J

License ClassAmateur Extra

Min. Class RequiredTechnician

LocationHerndon, VA

Grant DateOct 15, 2021

Expiration DateOct 15, 2031

Cancellation DateFeb 15, 2022

Available for ApplicationsFeb 16, 2024

KO4UBJ is a 2x3 format amateur radio callsign. It is currently registered to Mikkelsen, Donald J in Herndon, VA. There are currently no competing vanity applications or pending FCC filings on record for this callsign. Add it to your watchlist to receive an immediate alert if another operator files a vanity application.

CW & Voice Analysis

Morse Code

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

CW Weight: 44 units(Heavy (slower to send))

Voice Phonetics

Kilo Oscar Four Uniform Bravo Juliet

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 15, 2022
License ModifiedFeb 11, 2022
License ModifiedDec 8, 2021
System-Generated GrantOct 15, 2021
License IssuedOct 15, 2021

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

No competing applications on record. Verify on the FCC ULS application search before filing.

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FCC data as of Jul 10, 2026

Is KO4UBJ Available? FCC Vanity Status & Watchlist