Apparatus

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sensors Mode-S transponder

A9B402

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N724SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9B402
Octal
52332002
Decimal
11,121,666
Country
US
Tail
N724SK
Type
CRJ7
No current signal · last broadcast 4h ago
Flights observed
715
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A9B402.

Country allocation

The ICAO 24-bit address A9B402 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
SKW6439 SkyWest Airlines 11 2026-05-20
SKW6229 - 11 2026-06-18
SKW6218 - 10 2026-07-07
SKW6231 - 9 2026-07-05
SKW6204 - 9 2026-07-01
SKW4990 - 9 2026-07-01
SKW4943 SkyWest Airlines 9 2026-05-16
SKW4936 SkyWest Airlines 9 2026-05-16
SKW6407 - 8 2026-07-09
SKW6337 - 8 2026-07-03
SKW6271 SkyWest Airlines 8 2026-05-19
SKW6198 - 8 2026-07-05
SKW4986 SkyWest Airlines 8 2026-06-09
SKW4984 SkyWest Airlines 8 2026-06-12
SKW6489 SkyWest Airlines 7 2026-04-28
SKW6450 SkyWest Airlines 7 2026-05-19
SKW6433 SkyWest Airlines 7 2026-06-15
SKW6364 SkyWest Airlines 7 2026-04-28
SKW5014 - 7 2026-07-11
SKW5010 SkyWest Airlines 7 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW6467 - Jul 14, 02:45 UTCJul 14, 04:55 UTC2h 10m
2026-07-13 SKW225X - Jul 13, 22:00 UTCJul 14, 00:15 UTC2h 15m
2026-07-13 SKW225X IDA → DFW Jul 13, 21:30 UTCJul 14, 00:15 UTC2h 45m
2026-07-13 SKW9910 - Jul 13, 16:10 UTCJul 13, 18:15 UTC2h 5m
2026-07-13 SKW9910 ORD → IDA Jul 13, 16:01 UTCJul 13, 18:37 UTC2h 36m
2026-07-12 SKW6245 - Jul 12, 22:55 UTCJul 13, 00:25 UTC1h 30m
2026-07-12 SKW6245 ORD → LEX Jul 12, 20:55 UTCJul 12, 21:45 UTC50m
2026-07-12 SKW4989 FSD → ORD Jul 12, 17:12 UTCJul 12, 18:26 UTC1h 14m
2026-07-12 SKW4989 - Jul 12, 17:15 UTCJul 12, 18:25 UTC1h 10m
2026-07-12 SKW4989 ORD → FSD Jul 12, 15:01 UTCJul 12, 16:05 UTC1h 5m
2026-07-12 SKW6216 - Jul 12, 11:20 UTCJul 12, 12:35 UTC1h 15m
2026-07-12 SKW6216 TYS → ORD Jul 12, 11:14 UTCJul 12, 12:31 UTC1h 17m
2026-07-12 SKW5001 - Jul 12, 01:00 UTCJul 12, 02:10 UTC1h 10m
2026-07-12 SKW5001 ORD → TYS Jul 12, 00:59 UTCJul 12, 02:06 UTC1h 7m
2026-07-11 SKW5008 - Jul 11, 22:05 UTCJul 11, 23:00 UTC55m
2026-07-11 SKW5008 DAY → ORD Jul 11, 22:00 UTCJul 11, 22:49 UTC49m
2026-07-11 SKW5008 - Jul 11, 20:25 UTCJul 11, 21:10 UTC45m
2026-07-11 SKW5014 - Jul 11, 18:50 UTCJul 11, 18:55 UTC5m
2026-07-11 SKW5014 - Jul 11, 17:25 UTCJul 11, 18:55 UTC1h 30m
2026-07-11 SKW5014 TYS → ORD Jul 11, 17:16 UTCJul 11, 18:32 UTC1h 16m
2026-07-11 SKW5014 - Jul 11, 15:05 UTCJul 11, 16:10 UTC1h 5m
2026-07-11 SKW4974 - Jul 11, 12:30 UTCJul 11, 13:25 UTC55m
2026-07-11 SKW4974 DAY → ORD Jul 11, 12:28 UTCJul 11, 13:18 UTC50m
2026-07-11 SKW4972 ORD → DAY Jul 11, 02:05 UTCJul 11, 02:45 UTC40m
2026-07-10 SKW6245 - Jul 10, 22:55 UTCJul 11, 00:05 UTC1h 10m
2026-07-10 SKW6245 LEX → ORD Jul 10, 22:52 UTCJul 10, 23:56 UTC1h 4m
2026-07-10 SKW6245 - Jul 10, 21:05 UTCJul 10, 21:55 UTC50m
2026-07-10 SKW6352 STL → ORD Jul 10, 18:55 UTCJul 10, 19:45 UTC50m
2026-07-10 SKW6352 STL → ORD Jul 10, 18:44 UTCJul 10, 19:30 UTC46m
2026-07-10 SKW6352 - Jul 10, 16:55 UTCJul 10, 17:45 UTC50m
2026-07-10 SKW4969 - Jul 10, 14:15 UTCJul 10, 15:15 UTC1h 0m
2026-07-10 SKW4969 DSM → ORD Jul 10, 14:14 UTCJul 10, 15:13 UTC59m
2026-07-10 SKW4969 - Jul 10, 12:25 UTCJul 10, 13:20 UTC55m
2026-07-10 SKW6358 - Jul 10, 10:20 UTCJul 10, 10:50 UTC30m
2026-07-10 SKW6358 MKE → ORD Jul 10, 10:19 UTCJul 10, 10:26 UTC7m
2026-07-10 SKW6357 - Jul 10, 05:30 UTCJul 10, 05:45 UTC15m
2026-07-10 SKW6357 ORD → MKE Jul 10, 05:30 UTCJul 10, 05:43 UTC13m
2026-07-10 SKW6438 - Jul 10, 03:25 UTCJul 10, 04:05 UTC40m
2026-07-10 SKW6438 - Jul 10, 01:35 UTCJul 10, 04:05 UTC2h 30m
2026-07-10 SKW6438 ROC → ORD Jul 10, 01:34 UTCJul 10, 03:08 UTC1h 34m
2026-07-09 SKW6438 - Jul 9, 23:40 UTCJul 10, 00:50 UTC1h 10m
2026-07-09 SKW6407 - Jul 9, 21:00 UTCJul 9, 22:10 UTC1h 10m
2026-07-09 SKW6407 - Jul 9, 17:35 UTCJul 9, 18:30 UTC55m
2026-07-09 SKW6407 ORD → YYZ Jul 9, 17:32 UTCJul 9, 18:42 UTC1h 10m
2026-07-09 SKW6209 - Jul 9, 13:30 UTCJul 9, 15:35 UTC2h 5m
2026-07-09 SKW6405 - Jul 9, 00:05 UTCJul 9, 01:00 UTC55m
2026-07-08 SKW4820 - Jul 8, 21:35 UTCJul 8, 22:40 UTC1h 5m
2026-07-08 SKW4820 - Jul 8, 18:45 UTCJul 8, 19:40 UTC55m
2026-07-08 SKW4938 - Jul 8, 14:00 UTCJul 8, 15:20 UTC1h 20m
2026-07-08 SKW6210 - Jul 8, 00:50 UTCJul 8, 03:00 UTC2h 10m

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 N724SK page for operator, model, and routing details .

Mode-S A9B402 frequently asked

What is Mode-S code A9B402?
A9B402 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N724SK.
Where is Mode-S A9B402 registered?
Mode-S code A9B402 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 A9B402 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9B402, octal 52332002, decimal 11,121,666.
What flights does A9B402 operate?
Mode-S A9B402 has broadcast 20 distinct callsigns, including SKW6439, SKW6229, SKW6218, SKW6231, SKW6204.