Apparatus

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sensors Mode-S transponder

A40AA8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N36HF · SIKORSKY S-76 Spirit · operated by HELIFLITE SHARES LLC

Hex
A40AA8
Octal
51005250
Decimal
10,750,632
Country
US
Tail
N36HF
Type
S76
No current signal · last broadcast 5h ago
Flights observed
314
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A40AA8.

Country allocation

The ICAO 24-bit address A40AA8 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
N36HF - 314 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 N36HF - Jul 20, 20:00 UTCJul 20, 20:45 UTC45m
2026-07-20 N36HF - Jul 20, 18:55 UTCJul 20, 19:50 UTC55m
2026-07-20 N36HF - Jul 20, 13:50 UTCJul 20, 15:40 UTC1h 50m
2026-07-20 N36HF - Jul 20, 13:15 UTCJul 20, 13:25 UTC10m
2026-07-20 N36HF - Jul 20, 10:45 UTCJul 20, 12:20 UTC1h 35m
2026-07-20 N36HF - Jul 20, 00:15 UTCJul 20, 00:50 UTC35m
2026-07-19 N36HF - Jul 19, 23:05 UTCJul 19, 23:45 UTC40m
2026-07-19 N36HF - Jul 19, 13:25 UTCJul 19, 16:55 UTC3h 30m
2026-07-18 N36HF - Jul 18, 18:05 UTCJul 18, 18:25 UTC20m
2026-07-18 N36HF JRA → HPN Jul 18, 15:15 UTCJul 18, 15:50 UTC35m
2026-07-18 N36HF - Jul 18, 13:30 UTCJul 18, 13:35 UTC5m
2026-07-17 N36HF - Jul 17, 17:25 UTCJul 17, 19:00 UTC1h 35m
2026-07-17 N36HF - Jul 17, 15:25 UTCJul 17, 16:55 UTC1h 30m
2026-07-17 N36HF - Jul 17, 14:55 UTCJul 17, 15:10 UTC15m
2026-07-17 N36HF - Jul 17, 14:00 UTCJul 17, 14:10 UTC10m
2026-07-17 N36HF - Jul 17, 12:25 UTCJul 17, 13:00 UTC35m
2026-07-16 N36HF - Jul 16, 18:59 UTCJul 16, 20:15 UTC1h 15m
2026-07-16 N36HF - Jul 16, 18:15 UTCJul 16, 18:25 UTC10m
2026-07-16 N36HF - Jul 16, 14:00 UTCJul 16, 15:49 UTC1h 50m
2026-07-16 N36HF - Jul 16, 11:45 UTCJul 16, 13:54 UTC2h 10m
2026-07-15 N36HF - Jul 15, 22:15 UTCJul 16, 00:10 UTC1h 55m
2026-07-15 N36HF - Jul 15, 15:50 UTCJul 15, 17:15 UTC1h 25m
2026-07-15 N36HF - Jul 15, 15:25 UTCJul 15, 15:35 UTC10m
2026-07-15 N36HF - Jul 15, 12:20 UTCJul 15, 13:25 UTC1h 5m
2026-07-15 N36HF - Jul 15, 11:45 UTCJul 15, 12:05 UTC20m
2026-07-15 N36HF - Jul 15, 10:30 UTCJul 15, 11:05 UTC35m
2026-07-14 N36HF HTO → TSS Jul 14, 21:00 UTCJul 14, 21:55 UTC55m
2026-07-14 N36HF - Jul 14, 19:30 UTCJul 14, 20:15 UTC45m
2026-07-14 N36HF - Jul 14, 16:00 UTCJul 14, 16:40 UTC40m
2026-07-14 N36HF - Jul 14, 13:50 UTCJul 14, 14:30 UTC40m
2026-07-14 N36HF - Jul 14, 10:35 UTCJul 14, 12:10 UTC1h 35m
2026-07-14 N36HF - Jul 14, 02:40 UTCJul 14, 03:35 UTC55m
2026-07-13 N36HF - Jul 13, 23:35 UTCJul 14, 02:35 UTC3h 0m
2026-07-13 N36HF - Jul 13, 21:20 UTCJul 13, 23:30 UTC2h 10m
2026-07-13 N36HF - Jul 13, 19:35 UTCJul 13, 21:00 UTC1h 25m
2026-07-13 N36HF - Jul 13, 16:10 UTCJul 13, 18:00 UTC1h 50m
2026-07-13 N36HF - Jul 13, 10:35 UTCJul 13, 14:35 UTC4h 0m
2026-07-12 N36HF - Jul 12, 20:40 UTCJul 12, 21:35 UTC55m
2026-07-12 N36HF - Jul 12, 17:45 UTCJul 12, 18:20 UTC35m
2026-07-12 N36HF - Jul 12, 13:20 UTCJul 12, 16:30 UTC3h 10m
2026-07-11 N36HF - Jul 11, 21:20 UTCJul 11, 21:55 UTC35m
2026-07-11 N36HF - Jul 11, 17:55 UTCJul 11, 19:35 UTC1h 40m
2026-07-11 N36HF - Jul 11, 14:20 UTCJul 11, 15:05 UTC45m
2026-07-11 N36HF - Jul 11, 14:05 UTCJul 11, 14:15 UTC10m
2026-07-11 N36HF - Jul 11, 12:10 UTCJul 11, 12:55 UTC45m
2026-07-10 N36HF - Jul 10, 20:45 UTCJul 10, 21:55 UTC1h 10m
2026-07-10 N36HF - Jul 10, 19:05 UTCJul 10, 20:35 UTC1h 30m
2026-07-09 N36HF - Jul 9, 21:55 UTCJul 9, 23:30 UTC1h 35m
2026-07-09 N36HF - Jul 9, 17:15 UTCJul 9, 19:05 UTC1h 50m
2026-07-09 N36HF - Jul 9, 15:10 UTCJul 9, 16:25 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 N36HF page for operator, model, and routing details .

Mode-S A40AA8 frequently asked

What is Mode-S code A40AA8?
A40AA8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N36HF.
Where is Mode-S A40AA8 registered?
Mode-S code A40AA8 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 A40AA8 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A40AA8, octal 51005250, decimal 10,750,632.
What flights does A40AA8 operate?
Mode-S A40AA8 has broadcast 1 distinct callsign, including N36HF.