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

KO4ZO

Cancelled

Foster Sr, Robert M

Location: Alvin, TX
Class: Amateur Extra
Granted: 1992-06-09
Expires: 2002-06-09
Previous call: KC4SGN
FRN: 0002012771

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Vanity availability

Available

Available now

KO4ZO cleared its 2-year hold on 2003-08-02. Eligible for vanity application.

Last held by Foster Sr, Robert M (TX).

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

KC4SGN
no FCC ULS record on file

Prior holders later became

AD5FAactive· E
Foster Sr, Robert MTXgranted 2022-06-17

License history

0 events

No recorded events.

More vanity slots coming available

From Texas

All →

KF5RYH 2026-09-11
KF5RYM 2026-09-11
N5XCW 2026-09-11
KB5VBY 2026-09-12
KD5TVH 2026-09-12

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 →