Apparatus

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sensors Mode-S transponder

A2B9F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N275KH · BOMBARDIER CL-600 Challenger · operated by 75 EXPRESS INC

Hex
A2B9F8
Octal
50534770
Decimal
10,664,440
Country
US
Tail
N275KH
Type
CL60
Broadcasting now · callsign N275KH · 36,000 ft
Flights observed
24
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Current position

A2B9F8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B9F8 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
N275KH - 24 2026-07-16

Recent flights last 24

DateFlightRouteTakeoffLandingDuration
2026-07-16 N275KH - Jul 16, 17:00 UTCJul 16, 23:40 UTC6h 40m
2026-07-16 N275KH - Jul 16, 13:34 UTCJul 16, 16:00 UTC2h 25m
2026-07-16 N275KH - Jul 16, 12:14 UTCJul 16, 13:00 UTC45m
2026-07-16 N275KH - Jul 16, 08:35 UTCJul 16, 09:20 UTC45m
2026-07-16 N275KH - Jul 16, 07:35 UTCJul 16, 07:50 UTC15m
2026-07-15 N275KH BLQ → OLB Jul 15, 13:25 UTCJul 15, 14:20 UTC55m
2026-07-15 N275KH - Jul 15, 11:30 UTCJul 15, 12:10 UTC40m
2026-07-12 N275KH - Jul 12, 14:50 UTCJul 12, 15:30 UTC40m
2026-07-10 N275KH - Jul 10, 09:10 UTCJul 10, 09:40 UTC30m
2026-07-07 N275KH - Jul 7, 09:05 UTCJul 7, 11:55 UTC2h 50m
2026-07-07 N275KH - Jul 7, 02:45 UTCJul 7, 08:25 UTC5h 40m
2026-07-05 N275KH - Jul 5, 14:35 UTCJul 5, 21:45 UTC7h 10m
2026-07-05 N275KH - Jul 5, 11:15 UTCJul 5, 13:35 UTC2h 20m
2026-07-05 N275KH - Jul 5, 09:25 UTCJul 5, 10:30 UTC1h 5m
2026-07-05 N275KH - Jul 5, 08:40 UTCJul 5, 08:50 UTC10m
2026-07-04 N275KH - Jul 4, 06:00 UTCJul 4, 12:45 UTC6h 45m
2026-07-02 N275KH - Jul 2, 21:25 UTCJul 2, 21:50 UTC25m
2026-07-02 N275KH - Jul 2, 11:00 UTCJul 2, 11:25 UTC25m
2026-06-30 N275KH - Jun 30, 16:15 UTCJun 30, 16:45 UTC30m
2026-06-29 N275KH - Jun 29, 08:19 UTCJun 29, 13:09 UTC4h 50m
2026-06-28 N275KH - Jun 28, 13:25 UTCJun 28, 18:49 UTC5h 25m
2026-06-26 N275KH LNK → HPN Jun 26, 19:35 UTCJun 26, 21:55 UTC2h 20m
2026-06-24 N275KH LNK → LNK Jun 24, 13:10 UTCJun 24, 13:20 UTC10m
2026-06-19 N275KH LNK → LNK Jun 19, 20:04 UTCJun 19, 20:19 UTC15m

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 N275KH page for operator, model, and routing details .

Mode-S A2B9F8 frequently asked

What is Mode-S code A2B9F8?
A2B9F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N275KH.
Where is Mode-S A2B9F8 registered?
Mode-S code A2B9F8 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 A2B9F8 broadcasting right now?
Yes. Mode-S A2B9F8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B9F8, octal 50534770, decimal 10,664,440.
What flights does A2B9F8 operate?
Mode-S A2B9F8 has broadcast 1 distinct callsign, including N275KH.