CFCallsignFinder

Search Watchlist

Track FCC amateur radio vanity callsign availability. Data updated daily.

Legal & Info

Pricing FAQ Terms of Service Privacy Policy

© 2026 CallsignFinder. All rights reserved.

FCC data sourced from FCC Universal Licensing System. Not affiliated with the FCC.

Watchlist Search Account

Home/Search/W4KDU

← Back to results

W4KDU

Active1x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderSWITZER, JONAS L

License ClassGeneral

Min. Class RequiredGeneral

LocationDRY RIDGE, KY

Grant DateMay 3, 2022

Expiration DateMay 3, 2032

W4KDU is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by SWITZER, JONAS L in DRY RIDGE, KY. 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 SWITZER, JONAS L on Apr 14, 2022. W4KDU has 3 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 31 units(Moderate)

Voice Phonetics

Whiskey Four Kilo Delta Uniform

Readability: 7.5/10(High readability)

License History

License IssuedMay 3, 2022
Vanity Callsign GrantedMay 3, 2022
License ExpiredJun 16, 2010

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

SWITZER, JONAS LFiled Apr 14, 2022
Not awardedFCC ↗

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

← W4KDT W4KDW →

FCC data as of Sep 4, 2026

W4KDU FCC Vanity Status: 1 Competing Application & History