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

K4TWN

Cancelled

Sparks Sr., Jason C

Location: Paso Robles, CA
Class: Technician
Granted: 2019-11-19
Expires: 2029-11-19
Previous call: KN6FJU
FRN: 0028866192

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Vanity availability

Unknown

Status unknown

No vanity-slot record on file for K4TWN. Either it has never been issued, is currently held by an active license, or hasn't been re-computed since its last freeing event.

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

KK4HWLcancelled· T
White, Michael JTNgranted 2023-04-19cancelled 2024-05-10

Prior holders later became

W9THCcancelled· G
Sparks Sr., Jason CCAgranted 2019-12-13cancelled 2021-02-23

License history

0 events

No recorded events.

More vanity slots coming available

From California

All →

KC6OZS 2026-09-09
KD6MWG 2026-09-09
KG6NDR 2026-09-09
KG6NDX 2026-09-09
KG6NEF 2026-09-09

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 →