Confidence: Medium · Source: FCC ULS · As of 2026-09-09

K4REF

Active

Frost, Rick E

Location: Knoxville, TN
Class: Amateur Extra
Granted: 2019-07-23
Expires: 2029-07-31
Previous call: KJ4JRK
FRN: 0018535039

Get notified about status changes and vanity availability for this callsign.

Vanity availability

Held

Currently held

K4REF is held by an active license; it isn't a vanity slot right now.

Vanity availability dates are computed from FCC §97.19's hold periods: 2 years from the cancellation date for cancelled or terminated licenses, 4 years from the expiration date for expired licenses (2-year renewal grace + 2-year hold).

Callsign genealogy

Full chain →

Previously held by current licensee

KJ4JRKcancelled· T
Frost, Rick ETNgranted 2009-02-23cancelled 2009-07-31

License history

0 events

No recorded events.

More vanity slots coming available

From Tennessee

All →

KG4TWC 2026-09-10
KK4LNE 2026-09-10
KK4LNK 2026-09-10
KQ4TPH 2026-09-10
KQ4UUA 2026-09-10

Starting with K4

All →

K4HCL FL · 2026-09-09
K4CYG FL · 2026-09-10
K4LWW NC · 2026-09-10
K4ONS NC · 2026-09-10
K4YDD FL · 2026-09-10

Full history → Vanity availability → Callsign genealogy →