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/WD4O

← Back to results

WD4O

Active2x1District 4

Competitive callsign — 1 application filed with the FCC.

License HolderWALDRON, DENNIS B

License ClassAmateur Extra

Min. Class RequiredAmateur Extra

LocationDOUGLASVILLE, GA

Grant DateNov 14, 2018

Expiration DateNov 24, 2028

WD4O is a highly sought-after 2x1 format amateur radio callsign. The license is currently held by WALDRON, DENNIS B in DOUGLASVILLE, GA. 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 Castle, Kerry W on Dec 15, 2005. WD4O has 5 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 28 units(Light (fast to send))

Voice Phonetics

Whiskey Delta Four Oscar

Readability: 8.5/10(High readability)

License History

Authorization PrintedDec 11, 2018
Reference Copy Duplicate RequestedDec 7, 2018
License RenewedNov 14, 2018
License RenewedAug 28, 2008
Tax ID (TIN) AddedAug 26, 2008

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Castle, Kerry WFiled Dec 15, 2005
Not awardedFCC ↗

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

← WD4N WD4P →

FCC data as of Jul 29, 2026

WD4O FCC Vanity Status: 1 Competing Application & History