KB4MRU
Active2x3District 4
Competitive callsign — 2 applications filed with the FCC.
License HolderBAY AREA MOUNTAIN RESCUE UNIT
Min. Class RequiredTechnician
LocationSTANFORD, CA
Grant DateJan 3, 2026
Expiration DateJan 3, 2036
KB4MRU is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by BAY AREA MOUNTAIN RESCUE UNIT in STANFORD, 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 BAY AREA MOUNTAIN RESCUE UNIT on Dec 15, 2025. KB4MRU has 6 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- -... ....- -- .-. ..-
CW Weight: 36 units(Moderate)
Voice Phonetics
Kilo Bravo Four Mike Romeo Uniform
Readability: 7/10(Good readability)
License History
- License IssuedJan 3, 2026
- Vanity Callsign GrantedJan 3, 2026
- License ExpiredMar 6, 2025
- License IssuedMar 5, 2013
- Vanity Callsign GrantedMar 5, 2013
- License ExpiredNov 22, 2006
Vanity Application Activity
Competing applications filed with the FCC for this callsign.