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/K6CLS

← Back to results

K6CLS

Active1x3District 6

Competitive callsign — 3 applications filed with the FCC.

License HolderSojourner, Cliff L

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationPalo Alto, CA

Grant DateJan 28, 2026

Expiration DateFeb 4, 2036

K6CLS is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Sojourner, Cliff L in Palo Alto, CA. This callsign has attracted significant interest in the amateur radio community, with 3 vanity applications filed with the FCC. The most recent was submitted by Cooper, Kent E on Jan 21, 2021. K6CLS has 7 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 31 units(Moderate)

Voice Phonetics

Kilo Six Charlie Lima Sierra

Readability: 7.5/10(High readability)

License History

License RenewedJan 28, 2026
License RenewedNov 10, 2015
Administrative Update AppliedSep 7, 2012
License ModifiedMar 12, 2010
License ModifiedOct 8, 2009
License IssuedFeb 4, 2006
Vanity Callsign GrantedFeb 4, 2006

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Cooper, Kent EFiled Jan 21, 2021
Not awardedFCC ↗
Sojourner, Cliff LFiled Jan 17, 2006
Not awardedFCC ↗
Smith, Christina LFiled Jul 19, 2004
Not awardedFCC ↗

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

← K6CLR K6CLU →

FCC data as of Sep 12, 2026

K6CLS FCC Vanity Status: 3 Competing Applications & History