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

K4TBI

Active

IRWIN, THOMAS B

Location: LOUISVILLE, KY
Class: Amateur Extra
Granted: 2019-09-28
Expires: 2029-11-21
Previous call: KA4VFI
FRN: 0002962470

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Vanity availability

Held

Currently held

K4TBI 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

KA4VFIcancelled· E
IRWIN, THOMAS BKYgranted 2003-09-03cancelled 2009-11-21

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 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 →