KR4MTD
Active2x3District 4
No competing applications on record.
License HolderUnderdown, Mark J
License ClassTechnician
Min. Class RequiredTechnician
LocationKnoxville, TN
Grant DateJun 10, 2026
Expiration DateJun 10, 2036
KR4MTD is a 2x3 format amateur radio callsign. It is currently registered to Underdown, Mark J in Knoxville, TN. There are currently no competing vanity applications or pending FCC filings on record for this callsign. Add it to your watchlist to receive an immediate alert if another operator files a vanity application.
CW & Voice Analysis
Morse Code
-.- .-. ....- -- - -..
CW Weight: 33 units(Moderate)
Voice Phonetics
Kilo Romeo Four Mike Tango Delta
Readability: 7.5/10(High readability)
License History
- System-Generated GrantJun 10, 2026
- License IssuedJun 10, 2026
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications on record. Verify on the FCC ULS application search before filing.