Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4D040

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N409YK · operated by AIRCRAFT 25859 LLC

Hex
A4D040
Octal
51150100
Decimal
10,801,216
Country
US
Tail
N409YK
Type
B734
No current signal · last broadcast Jul 24, 02:40 UTC
Flights observed
330
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 02:40 UTC

Last known position

Most recent position reported by Mode-S A4D040.

Country allocation

The ICAO 24-bit address A4D040 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 20 distinct

Callsign Airline Flights Last seen
NAC733 Northern Air Cargo 34 2026-07-21
NAC732 - 34 2026-07-21
NAC721 - 26 2026-07-20
NAC723 Northern Air Cargo 24 2026-07-17
NAC722 - 22 2026-07-17
NAC772 Northern Air Cargo 21 2026-07-20
NAC720 Northern Air Cargo 20 2026-07-20
NAC1780 - 19 2026-07-15
NAC1781 - 18 2026-07-15
NAC773 Northern Air Cargo 12 2026-07-20
NAC751 - 8 2026-07-14
NAC750 - 8 2026-07-14
NAC730 - 7 2026-07-06
NAC768 Northern Air Cargo 5 2026-07-21
NAC767 Northern Air Cargo 5 2026-05-22
NAC760 - 5 2026-06-25
NAC724 - 5 2026-07-06
NAC769 Northern Air Cargo 4 2026-07-21
NAC765 Northern Air Cargo 4 2026-07-23
NAC1783 Northern Air Cargo 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 NAC2721 OME → ANC Jul 23, 22:40 UTCJul 24, 02:30 UTC3h 50m
2026-07-23 NAC765 BRW → ANC Jul 23, 15:00 UTCJul 23, 21:20 UTC6h 20m
2026-07-23 NC725 OME → ANC Jul 23, 04:20 UTCJul 23, 05:35 UTC1h 15m
2026-07-23 NC724 ANC → OTZ Jul 23, 01:55 UTCJul 23, 03:15 UTC1h 20m
2026-07-23 NAC755 UNK → ANC Jul 23, 00:00 UTCJul 23, 00:45 UTC45m
2026-07-22 NAC754 ANC → UNK Jul 22, 22:00 UTCJul 22, 22:55 UTC55m
2026-07-21 NAC769 SCC → ANC Jul 21, 20:40 UTCJul 21, 21:25 UTC45m
2026-07-21 NAC768 ANC → BRW Jul 21, 14:30 UTCJul 21, 17:30 UTC3h 0m
2026-07-21 NAC733 BET → ANC Jul 21, 04:25 UTCJul 21, 05:10 UTC45m
2026-07-21 NAC732 - Jul 21, 02:30 UTCJul 21, 03:15 UTC45m
2026-07-20 NAC773 AKN → ANC Jul 20, 21:35 UTCJul 20, 22:40 UTC1h 5m
2026-07-20 NAC772 ANC → DLG Jul 20, 20:25 UTCJul 20, 20:40 UTC15m
2026-07-20 NAC772 ANC → DLG Jul 20, 18:55 UTCJul 20, 19:45 UTC50m
2026-07-20 NAC721 - Jul 20, 16:15 UTCJul 20, 17:35 UTC1h 20m
2026-07-20 NAC720 ANC → OME Jul 20, 14:00 UTCJul 20, 15:00 UTC1h 0m
2026-07-17 NAC723 OTZ → ANC Jul 17, 20:00 UTCJul 17, 21:25 UTC1h 25m
2026-07-17 NAC723 OTZ → ANC Jul 17, 18:40 UTCJul 17, 19:05 UTC25m
2026-07-17 NAC722 - Jul 17, 14:04 UTCJul 17, 15:40 UTC1h 35m
2026-07-17 NAC733 BET → ANC Jul 17, 04:25 UTCJul 17, 05:20 UTC55m
2026-07-17 NAC732 - Jul 17, 02:30 UTCJul 17, 03:14 UTC45m
2026-07-16 NAC773 AKN → ANC Jul 16, 22:00 UTCJul 16, 22:55 UTC55m
2026-07-16 NAC772 ANC → DLG Jul 16, 20:15 UTCJul 16, 20:29 UTC15m
2026-07-16 NAC772 ANC → DLG Jul 16, 18:29 UTCJul 16, 19:25 UTC55m
2026-07-16 NAC721 - Jul 16, 16:05 UTCJul 16, 17:20 UTC1h 15m
2026-07-16 NAC720 - Jul 16, 14:00 UTCJul 16, 14:50 UTC50m
2026-07-16 NAC733 - Jul 16, 04:15 UTCJul 16, 05:05 UTC50m
2026-07-16 NAC732 - Jul 16, 02:15 UTCJul 16, 03:00 UTC45m
2026-07-15 NAC1781 - Jul 15, 22:00 UTCJul 15, 23:20 UTC1h 20m
2026-07-15 NAC1780 - Jul 15, 19:30 UTCJul 15, 20:55 UTC1h 25m
2026-07-15 NAC721 - Jul 15, 14:05 UTCJul 15, 17:20 UTC3h 15m
2026-07-15 NAC733 - Jul 15, 04:35 UTCJul 15, 05:25 UTC50m
2026-07-15 NAC732 - Jul 15, 02:35 UTCJul 15, 03:20 UTC45m
2026-07-14 NAC751 - Jul 14, 22:25 UTCJul 14, 23:10 UTC44m
2026-07-14 NAC750 - Jul 14, 20:15 UTCJul 14, 20:55 UTC40m
2026-07-14 NAC1781 - Jul 14, 17:45 UTCJul 14, 19:15 UTC1h 30m
2026-07-14 NAC1780 - Jul 14, 15:05 UTCJul 14, 16:25 UTC1h 20m
2026-07-14 NAC733 - Jul 14, 04:05 UTCJul 14, 04:50 UTC45m
2026-07-14 NAC732 - Jul 14, 02:10 UTCJul 14, 03:00 UTC50m
2026-07-13 NAC773 - Jul 13, 21:30 UTCJul 13, 22:15 UTC45m
2026-07-13 NAC772 - Jul 13, 20:35 UTCJul 13, 20:50 UTC15m
2026-07-13 NAC772 - Jul 13, 19:00 UTCJul 13, 19:50 UTC50m
2026-07-13 NAC721 - Jul 13, 16:15 UTCJul 13, 17:25 UTC1h 10m
2026-07-13 NAC720 - Jul 13, 13:50 UTCJul 13, 14:55 UTC1h 5m
2026-07-11 NAC1781 - Jul 11, 21:40 UTCJul 11, 23:10 UTC1h 30m
2026-07-11 NAC1780 - Jul 11, 19:45 UTCJul 11, 21:00 UTC1h 15m
2026-07-11 NAC721 - Jul 11, 14:00 UTCJul 11, 17:10 UTC3h 10m
2026-07-10 NAC751 - Jul 10, 21:45 UTCJul 10, 22:25 UTC40m
2026-07-10 NAC750 - Jul 10, 19:40 UTCJul 10, 20:15 UTC35m
2026-07-10 NAC723 - Jul 10, 16:45 UTCJul 10, 18:05 UTC1h 20m
2026-07-10 NAC722 - Jul 10, 14:35 UTCJul 10, 15:50 UTC1h 15m

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 N409YK page for operator, model, and routing details .

Mode-S A4D040 frequently asked

What is Mode-S code A4D040?
A4D040 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N409YK.
Where is Mode-S A4D040 registered?
Mode-S code A4D040 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 A4D040 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 02:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4D040, octal 51150100, decimal 10,801,216.
What flights does A4D040 operate?
Mode-S A4D040 has broadcast 20 distinct callsigns, including NAC733, NAC732, NAC721, NAC723, NAC722.