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

K4TNX

Active

CZEPCZYNSKI, ARTUR O

Location: SUN PRAIRIE, WI
Class: Amateur Extra
Granted: 2022-08-03
Expires: 2032-08-07
Previous call: NH7FL
FRN: 0004724134

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Vanity availability

Held

Currently held

K4TNX is held by an active license; it isn't a vanity slot right now.

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

NH7FLcancelled· G
CZEPCZYNSKI, ARTUR OTNgranted 2006-11-02cancelled 2012-08-07
KB0ZKZcancelled· G
CZEPCZYNSKI, ARTUR OHIgranted 1997-07-15cancelled 2001-05-18

License history

0 events

No recorded events.

More vanity slots coming available

From Wisconsin

All →

KD9OFI 2026-09-10
KD9ZZQ 2026-09-10
KK4LOF 2026-09-11
N9ZRB 2026-09-13
W7QFX 2026-09-13

Starting with K4

All →

K4CYG FL · 2026-09-10
K4LWW NC · 2026-09-10
K4ONS NC · 2026-09-10
K4YDD FL · 2026-09-10
K4KLP TN · 2026-09-13

Full history → Vanity availability → Callsign genealogy →