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WB4MRK

Available2x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderKELLER, MICHAEL R

License ClassGeneral

Min. Class RequiredTechnician

LocationFinksburg, MD

Grant DateApr 9, 2004

Expiration DateApr 9, 2014

Cancellation DateJul 27, 2012

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WB4MRK

Available2x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderKELLER, MICHAEL R

License ClassGeneral

Min. Class RequiredTechnician

LocationFinksburg, MD

Grant DateApr 9, 2004

Expiration DateApr 9, 2014

Cancellation DateJul 27, 2012

Available for ApplicationsJul 28, 2014

WB4MRK is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by KELLER, MICHAEL R in Finksburg, MD. 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 KELLER, MICHAEL R on Mar 22, 2004. WB4MRK has 5 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 38 units(Moderate)

Voice Phonetics

Whiskey Bravo Four Mike Romeo Kilo

Readability: 7.5/10(High readability)

This callsign is available now

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

License History

License CanceledJul 27, 2012
Administrative Update AppliedJul 10, 2012
Administrative Update AppliedJan 4, 2006
License IssuedApr 9, 2004
Vanity Callsign GrantedApr 9, 2004

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

KELLER, MICHAEL RFiled Mar 22, 2004
Not awardedFCC ↗

Search external databases

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FCC data as of Sep 4, 2026

WB4MRK FCC Vanity Status: 1 Competing Application & History