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/K4RKR

← Back to results

K4RKR

Active1x3District 4

Competitive callsign — 2 applications filed with the FCC.

License HolderNANBU, GERALD

License ClassGeneral

Min. Class RequiredGeneral

LocationWALNUT CREEK, CA

Grant DateNov 5, 2020

Expiration DateJan 4, 2031

K4RKR is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by NANBU, GERALD in WALNUT CREEK, CA. This callsign has attracted significant interest in the amateur radio community, with 2 vanity applications filed with the FCC. The most recent was submitted by Walker, Bryan S on Dec 16, 2010. K4RKR has 5 recorded FCC license history events.

CW & Voice Analysis

Morse Code

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

CW Weight: 31 units(Moderate)

Voice Phonetics

Kilo Four Romeo Kilo Romeo

Readability: 7/10(Good readability)

License History

License RenewedNov 5, 2020
Administrative Update AppliedApr 17, 2015
License IssuedJan 4, 2011
Vanity Callsign GrantedJan 4, 2011
License ExpiredNov 4, 2006

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Walker, Bryan SFiled Dec 16, 2010
Not awardedFCC ↗
LIGHTCAP, PATRICK EFiled Mar 9, 2007
Not awardedFCC ↗

Search external databases

QRZ ↗HamQTH ↗

Explore nearby callsigns

← K4RKQ K4RKS →

FCC data as of Sep 4, 2026

K4RKR FCC Vanity Status: 2 Competing Applications & History