Confidence: Medium · Source: FCC ULS · As of 2026-09-10

KO4ASF

Cancelled

RUDOLPH, JOHN S

Location: DAWSON SPRINGS, KY
Class: Technician
Granted: 2019-12-26
Expires: 2029-12-26
FRN: 0019445634

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Vanity availability

Available

Available now

KO4ASF cleared its 2-year hold on 2022-01-13. Eligible for vanity application.

Last held by RUDOLPH, JOHN S (KY).

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 →

Prior holders later became

KB7RDYcancelled· G
RUDOLPH, JOHN SKYgranted 2020-01-14cancelled 2020-02-01

License history

0 events

No recorded events.

More vanity slots coming available

From Kentucky

All →

KD4STD 2026-09-10
KK4LMT 2026-09-10
KG4VAS 2026-09-11
KG4VAT 2026-09-11
K4OTU 2026-09-14

Starting with KO4

All →

KO4UTL FL · 2026-09-13
KO4PTL KY · 2026-09-17
KO4OSB VA · 2026-09-21
KO4TMC FL · 2026-09-21
KO4YVJ FL · 2026-09-24

Full history → Vanity availability → Callsign genealogy →