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

K6SFK

Cancelled

Koster, Stephen F

Location: Geyserville, CA
Class: General
Granted: 2010-08-13
Expires: 2020-08-13
Previous call: KJ6JVP
FRN: 0020061214

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Vanity availability

Available

Available now

K6SFK cleared its 2-year hold on 2014-02-03. Eligible for vanity application.

Last held by Koster, Stephen F (CA).

Confidence: High

Cancelled licenses begin the 2-year hold immediately, so this date is the firm release date per §97.19. Already past — fileable subject to FCC verification.

Callsign genealogy

Full chain →

Previously held by current licensee

KJ6JVPcancelled· T
Koster, Stephen FCAgranted 2010-07-22cancelled 2010-08-13

Prior holders later became

W6SFKactive· E
Koster, Steve FCAgranted 2021-11-16

License history

0 events

No recorded events.

More vanity slots coming available

From California

All →

AC2TX 2026-09-10
K6DJM 2026-09-10
KC6JGS 2026-09-10
KC6KGL 2026-09-10
KC6VEU 2026-09-10

Starting with K6

All →

K6DJM CA · 2026-09-10
K6IGU UT · 2026-09-14
K6BSV WA · 2026-09-25
K6KA TN · 2026-09-25
K6KOA HI · 2026-10-01

Full history → Vanity availability → Callsign genealogy →