Apparatus

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sensors Mode-S transponder

A21771

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N234AW · PILATUS PC-12 · operated by N234AW LLC

Hex
A21771
Octal
50413561
Decimal
10,622,833
Country
US
Tail
N234AW
Type
PC12
No current signal · last broadcast 15h ago
Flights observed
232
Distinct callsigns
3
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A21771.

Country allocation

The ICAO 24-bit address A21771 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 3 distinct

Callsign Airline Flights Last seen
KEN46 Kenmore Air 205 2026-07-26
KEN746 Kenmore Air 18 2026-07-26
KEN747 - 9 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KEN46 PAE → SMO Jul 26, 21:35 UTCJul 26, 22:15 UTC40m
2026-07-26 KEN46 PAE → SMO Jul 26, 18:25 UTCJul 26, 20:40 UTC2h 15m
2026-07-26 KEN746 BFI → YYJ Jul 26, 16:15 UTCJul 26, 17:05 UTC50m
2026-07-26 KEN46 PAE → SMO Jul 26, 15:15 UTCJul 26, 15:25 UTC10m
2026-07-25 KEN46 PAE → SMO Jul 25, 22:10 UTCJul 25, 23:25 UTC1h 15m
2026-07-25 KEN746 BFI → YYJ Jul 25, 21:05 UTCJul 25, 21:25 UTC20m
2026-07-25 KEN46 PAE → SMO Jul 25, 19:25 UTCJul 25, 20:35 UTC1h 10m
2026-07-25 KEN46 PAE → SMO Jul 25, 16:35 UTCJul 25, 17:40 UTC1h 5m
2026-07-24 KEN46 PAE → SMO Jul 24, 22:30 UTCJul 25, 01:30 UTC3h 0m
2026-07-24 KEN46 PAE → SMO Jul 24, 17:20 UTCJul 24, 21:30 UTC4h 10m
2026-07-24 KEN46 PAE → SMO Jul 24, 15:45 UTCJul 24, 16:05 UTC20m
2026-07-23 KEN46 PAE → SMO Jul 23, 22:55 UTCJul 23, 23:10 UTC15m
2026-07-23 KEN46 PAE → SMO Jul 23, 21:35 UTCJul 23, 22:35 UTC1h 0m
2026-07-23 KEN747 - Jul 23, 18:15 UTCJul 23, 19:30 UTC1h 15m
2026-07-23 KEN46 PAE → SMO Jul 23, 15:05 UTCJul 23, 16:45 UTC1h 40m
2026-07-22 KEN46 PAE → SMO Jul 22, 00:05 UTCJul 22, 00:50 UTC45m
2026-07-21 KEN46 PAE → SMO Jul 21, 23:05 UTCJul 21, 23:20 UTC15m
2026-07-21 KEN747 - Jul 21, 18:45 UTCJul 21, 19:30 UTC45m
2026-07-21 KEN746 - Jul 21, 16:15 UTCJul 21, 17:40 UTC1h 25m
2026-07-21 KEN46 - Jul 21, 14:35 UTCJul 21, 14:55 UTC20m
2026-07-19 KEN46 - Jul 19, 22:35 UTCJul 19, 23:10 UTC35m
2026-07-19 KEN46 - Jul 19, 21:20 UTCJul 19, 21:45 UTC25m
2026-07-19 KEN747 - Jul 19, 18:45 UTCJul 19, 19:45 UTC1h 0m
2026-07-19 KEN746 - Jul 19, 16:40 UTCJul 19, 17:45 UTC1h 5m
2026-07-18 KEN46 BFI → PAE Jul 18, 18:25 UTCJul 18, 18:40 UTC15m
2026-07-18 KEN747 - Jul 18, 17:15 UTCJul 18, 18:10 UTC55m
2026-07-18 KEN746 - Jul 18, 15:05 UTCJul 18, 15:55 UTC50m
2026-07-18 KEN746 - Jul 18, 13:40 UTCJul 18, 14:10 UTC30m
2026-07-17 KEN747 - Jul 17, 19:30 UTCJul 17, 20:25 UTC55m
2026-07-17 KEN746 - Jul 17, 17:25 UTCJul 17, 18:25 UTC1h 0m
2026-07-17 KEN46 - Jul 17, 14:04 UTCJul 17, 14:15 UTC10m
2026-07-16 KEN46 - Jul 16, 22:35 UTCJul 16, 23:49 UTC1h 15m
2026-07-16 KEN46 - Jul 16, 20:25 UTCJul 16, 20:55 UTC30m
2026-07-16 KEN46 - Jul 16, 16:49 UTCJul 16, 17:20 UTC30m
2026-07-15 KEN46 - Jul 15, 16:25 UTCJul 15, 16:55 UTC30m
2026-07-15 KEN46 - Jul 15, 14:40 UTCJul 15, 15:00 UTC20m
2026-07-14 KEN46 BFI → PAE Jul 14, 17:20 UTCJul 14, 18:35 UTC1h 15m
2026-07-14 KEN46 - Jul 14, 16:10 UTCJul 14, 16:25 UTC15m
2026-07-14 KEN46 - Jul 14, 00:00 UTCJul 14, 01:30 UTC1h 30m
2026-07-13 KEN46 - Jul 13, 22:15 UTCJul 13, 22:55 UTC40m
2026-07-13 KEN46 - Jul 13, 16:05 UTCJul 13, 17:35 UTC1h 30m
2026-07-13 KEN46 - Jul 13, 14:15 UTCJul 13, 15:25 UTC1h 10m
2026-07-12 KEN46 - Jul 12, 19:01 UTCJul 12, 19:55 UTC55m
2026-07-12 KEN46 - Jul 12, 17:45 UTCJul 12, 17:55 UTC10m
2026-07-12 KEN46 - Jul 12, 16:40 UTCJul 12, 17:05 UTC25m
2026-07-12 KEN46 - Jul 12, 15:35 UTCJul 12, 15:50 UTC15m
2026-07-11 KEN46 - Jul 11, 18:10 UTCJul 11, 22:01 UTC3h 50m
2026-07-11 KEN46 - Jul 11, 13:30 UTCJul 11, 17:25 UTC3h 55m
2026-07-09 KEN46 - Jul 9, 23:30 UTCJul 10, 00:40 UTC1h 10m
2026-07-09 KEN46 - Jul 9, 22:15 UTCJul 9, 22:45 UTC30m

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 N234AW page for operator, model, and routing details .

Mode-S A21771 frequently asked

What is Mode-S code A21771?
A21771 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N234AW.
Where is Mode-S A21771 registered?
Mode-S code A21771 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 A21771 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21771, octal 50413561, decimal 10,622,833.
What flights does A21771 operate?
Mode-S A21771 has broadcast 3 distinct callsigns, including KEN46, KEN746, KEN747.