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

W4DIO

Cancelled

Kniss, William F

Location: Lyles, TN
Class: Technician
Granted: 2020-07-03
Expires: 2030-07-03
Previous call: KO4DOC
FRN: 0025055096

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Vanity availability

Available

Available now

W4DIO cleared its 2-year hold on 2022-12-01. Eligible for vanity application.

Last held by Kniss, William F (TN).

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

KO4DOCactive· T
Cueto, SadocFLgranted 2024-06-28
KO4RPPcancelled· T
Cueto, SadocFLgranted 2021-06-29cancelled 2024-06-28

Prior holders later became

K2LXAactive· T
Kniss, William FTNgranted 2020-12-01

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 W4

All →

W4HKO FL · 2026-09-09
W4IDI AL · 2026-09-10
W4YAU TN · 2026-09-10
W4CVH VA · 2026-09-12
W4QDZ NC · 2026-09-13

Full history → Vanity availability → Callsign genealogy →