Apparatus

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sensors Mode-S transponder

A4DC79

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N412KK · BELL 206 JetRanger · operated by ELKHORN AVIATION INC

Hex
A4DC79
Octal
51156171
Decimal
10,804,345
Country
US
Tail
N412KK
Type
B06
No current signal · last broadcast Jul 25, 17:40 UTC
Flights observed
32
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 17:40 UTC

Last known position

Most recent position reported by Mode-S A4DC79.

Country allocation

The ICAO 24-bit address A4DC79 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N412KK - 32 2026-07-25

Recent flights last 32

DateFlightRouteTakeoffLandingDuration
2026-07-25 N412KK - Jul 25, 17:20 UTCJul 25, 17:40 UTC20m
2026-07-24 N412KK - Jul 24, 23:35 UTCJul 25, 00:00 UTC25m
2026-07-24 N412KK - Jul 24, 18:05 UTCJul 24, 18:55 UTC50m
2026-07-23 N412KK - Jul 23, 20:20 UTCJul 23, 20:45 UTC25m
2026-07-23 N412KK - Jul 23, 17:40 UTCJul 23, 18:40 UTC1h 0m
2026-07-21 N412KK - Jul 21, 22:30 UTCJul 22, 01:35 UTC3h 5m
2026-07-21 N412KK - Jul 21, 17:15 UTCJul 21, 20:00 UTC2h 45m
2026-07-20 N412KK - Jul 20, 23:10 UTCJul 21, 01:55 UTC2h 45m
2026-07-20 N412KK - Jul 20, 17:50 UTCJul 20, 20:40 UTC2h 50m
2026-07-19 N412KK - Jul 19, 22:05 UTCJul 20, 00:55 UTC2h 50m
2026-07-19 N412KK - Jul 19, 17:10 UTCJul 19, 20:00 UTC2h 50m
2026-07-19 N412KK - Jul 19, 02:55 UTCJul 19, 04:10 UTC1h 15m
2026-07-18 N412KK - Jul 18, 21:40 UTCJul 19, 00:45 UTC3h 5m
2026-07-18 N412KK - Jul 18, 01:00 UTCJul 18, 03:45 UTC2h 46m
2026-07-17 N412KK - Jul 17, 20:35 UTCJul 17, 21:20 UTC45m
2026-07-17 N412KK - Jul 17, 00:30 UTCJul 17, 02:34 UTC2h 5m
2026-07-16 N412KK - Jul 16, 18:55 UTCJul 16, 22:10 UTC3h 15m
2026-07-16 N412KK - Jul 16, 01:45 UTCJul 16, 04:05 UTC2h 20m
2026-07-15 N412KK - Jul 15, 20:55 UTCJul 15, 23:40 UTC2h 45m
2026-07-15 N412KK - Jul 15, 01:45 UTCJul 15, 04:05 UTC2h 20m
2026-07-14 N412KK - Jul 14, 20:50 UTCJul 15, 00:00 UTC3h 9m
2026-07-14 N412KK - Jul 14, 17:05 UTCJul 14, 17:20 UTC15m
2026-07-14 N412KK - Jul 14, 02:05 UTCJul 14, 04:10 UTC2h 5m
2026-07-13 N412KK - Jul 13, 21:00 UTCJul 14, 00:05 UTC3h 5m
2026-07-13 N412KK - Jul 13, 16:50 UTCJul 13, 19:05 UTC2h 15m
2026-07-13 N412KK - Jul 13, 01:01 UTCJul 13, 04:05 UTC3h 5m
2026-07-12 N412KK - Jul 12, 21:20 UTCJul 12, 23:10 UTC1h 50m
2026-07-12 N412KK - Jul 12, 16:01 UTCJul 12, 18:25 UTC2h 25m
2026-07-12 N412KK - Jul 12, 01:25 UTCJul 12, 03:55 UTC2h 30m
2026-07-11 N412KK - Jul 11, 19:50 UTCJul 11, 22:10 UTC2h 20m
2026-07-11 N412KK - Jul 11, 15:30 UTCJul 11, 15:50 UTC20m
2026-06-30 N412KK - Jun 30, 14:00 UTCJun 30, 14:25 UTC25m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N412KK page for operator, model, and routing details .

Mode-S A4DC79 frequently asked

What is Mode-S code A4DC79?
A4DC79 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N412KK.
Where is Mode-S A4DC79 registered?
Mode-S code A4DC79 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4DC79 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 17:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DC79, octal 51156171, decimal 10,804,345.
What flights does A4DC79 operate?
Mode-S A4DC79 has broadcast 1 distinct callsign, including N412KK.