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
Broadcasting now · callsign SKW6217 · 2,975 ft
Flights observed
812
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

A9B402 is currently broadcasting. Map zoomed to live position.

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
SKW6407 - 11 2026-07-21
SKW6229 - 11 2026-06-18
SKW4984 SkyWest Airlines 11 2026-07-20
SKW6218 - 10 2026-07-07
SKW4990 SkyWest Airlines 10 2026-07-26
SKW6231 - 9 2026-07-05
SKW6204 - 9 2026-07-01
SKW4969 SkyWest Airlines 9 2026-07-23
SKW4943 SkyWest Airlines 9 2026-05-16
SKW4936 SkyWest Airlines 9 2026-05-16
SKW6433 SkyWest Airlines 8 2026-07-26
SKW6385 - 8 2026-07-15
SKW6337 - 8 2026-07-03
SKW6271 SkyWest Airlines 8 2026-05-19
SKW6198 - 8 2026-07-05
SKW4986 SkyWest Airlines 8 2026-06-09
SKW6489 SkyWest Airlines 7 2026-04-28
SKW6450 SkyWest Airlines 7 2026-05-19
SKW6364 SkyWest Airlines 7 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6433 PHX → BFL Jul 26, 22:20 UTCJul 26, 22:30 UTC10m
2026-07-26 SKW6488 ORD → YYZ Jul 26, 19:20 UTCJul 26, 20:30 UTC1h 10m
2026-07-26 SKW6488 ORD → YYZ Jul 26, 13:40 UTCJul 26, 14:50 UTC1h 10m
2026-07-26 SKW4914 ORD → RIC Jul 26, 11:15 UTCJul 26, 11:40 UTC25m
2026-07-26 SKW4914 ORD → RIC Jul 26, 11:11 UTCJul 26, 11:37 UTC26m
2026-07-26 SKW6357 BHM → ORD Jul 26, 04:20 UTCJul 26, 04:45 UTC25m
2026-07-26 SKW6357 BHM → ORD Jul 26, 04:24 UTCJul 26, 04:43 UTC19m
2026-07-26 SKW4990 SBP → PHX Jul 26, 02:30 UTCJul 26, 02:50 UTC20m
2026-07-26 SKW4941 PHX → MRY Jul 26, 00:30 UTCJul 26, 00:50 UTC20m
2026-07-25 SKW6200 DFW → SJT Jul 25, 21:45 UTCJul 25, 23:00 UTC1h 15m
2026-07-25 SKW6200 DFW → SJT Jul 25, 19:50 UTCJul 25, 20:50 UTC1h 0m
2026-07-25 SKW6244 ORD → FSD Jul 25, 15:40 UTCJul 25, 16:40 UTC1h 0m
2026-07-25 SKW6244 ORD → FSD Jul 25, 15:38 UTCJul 25, 16:22 UTC44m
2026-07-25 SKW6244 ORD → FSD Jul 25, 13:35 UTCJul 25, 14:25 UTC50m
2026-07-25 SKW6338 PHX → TUL Jul 25, 10:59 UTCJul 25, 11:46 UTC47m
2026-07-25 SKW6338 PHX → TUL Jul 25, 11:00 UTCJul 25, 12:00 UTC1h 0m
2026-07-25 SKW6396 BNA → ORD Jul 25, 04:10 UTCJul 25, 05:00 UTC50m
2026-07-25 SKW6396 BNA → ORD Jul 25, 04:09 UTCJul 25, 04:59 UTC50m
2026-07-25 SKW6285 LAX → SLC Jul 25, 01:00 UTCJul 25, 02:30 UTC1h 30m
2026-07-24 SKW6285 LAX → SLC Jul 24, 22:35 UTCJul 25, 00:05 UTC1h 30m
2026-07-24 SKW6386 LBB → DFW Jul 24, 18:45 UTCJul 24, 20:55 UTC2h 10m
2026-07-24 SKW6386 LBB → DFW Jul 24, 18:32 UTCJul 24, 20:43 UTC2h 11m
2026-07-24 SKW4929 DFW → DRO Jul 24, 14:40 UTCJul 24, 16:45 UTC2h 5m
2026-07-24 SKW4992 ICT → ORD Jul 24, 13:20 UTCJul 24, 13:35 UTC15m
2026-07-24 SKW4992 ICT → ORD Jul 24, 13:00 UTCJul 24, 13:15 UTC15m
2026-07-23 SKW6410 DFW → HOU Jul 23, 23:45 UTCJul 24, 00:30 UTC45m
2026-07-23 SKW6410 DFW → HOU Jul 23, 23:23 UTCJul 24, 00:20 UTC57m
2026-07-23 SKW6205 SFO → LAX Jul 23, 20:50 UTCJul 23, 22:30 UTC1h 40m
2026-07-23 SKW6205 SFO → LAX Jul 23, 20:37 UTCJul 23, 22:29 UTC1h 52m
2026-07-23 SKW6427 ORD → ASE Jul 23, 17:00 UTCJul 23, 19:15 UTC2h 15m
2026-07-23 SKW4969 DFW → LRD Jul 23, 14:20 UTCJul 23, 15:05 UTC45m
2026-07-23 SKW4969 DFW → LRD Jul 23, 14:16 UTCJul 23, 15:04 UTC48m
2026-07-23 SKW4969 DFW → LRD Jul 23, 12:15 UTCJul 23, 13:05 UTC50m
2026-07-23 SKW6208 LAX → AUS Jul 23, 09:35 UTCJul 23, 10:10 UTC35m
2026-07-23 SKW6212 PHX → SEA Jul 23, 04:10 UTCJul 23, 04:35 UTC25m
2026-07-23 SKW6212 PHX → SEA Jul 23, 04:09 UTCJul 23, 04:46 UTC37m
2026-07-23 SKW6285 LAX → SLC Jul 23, 00:05 UTCJul 23, 01:50 UTC1h 45m
2026-07-22 SKW6285 LAX → SLC Jul 22, 21:40 UTCJul 22, 23:10 UTC1h 30m
2026-07-22 SKW6249 PHX → GJT Jul 22, 18:55 UTCJul 22, 19:55 UTC1h 0m
2026-07-22 SKW6249 PHX → GJT Jul 22, 18:50 UTCJul 22, 19:50 UTC1h 0m
2026-07-22 SKW6249 PHX → GJT Jul 22, 16:50 UTCJul 22, 17:50 UTC1h 0m
2026-07-22 SKW6213 ORD → SGF Jul 22, 12:45 UTCJul 22, 13:15 UTC30m
2026-07-22 SKW4941 PHX → MRY Jul 22, 00:50 UTCJul 22, 01:10 UTC20m
2026-07-21 SKW6407 - Jul 21, 19:30 UTCJul 21, 20:45 UTC1h 15m
2026-07-21 SKW6407 YYZ → ORD Jul 21, 19:29 UTCJul 21, 20:41 UTC1h 12m
2026-07-21 SKW6407 - Jul 21, 17:10 UTCJul 21, 18:15 UTC1h 5m
2026-07-21 SKW6209 MAF → DFW Jul 21, 13:25 UTCJul 21, 15:35 UTC2h 10m
2026-07-21 SKW6405 DFW → SAF Jul 21, 01:01 UTCJul 21, 02:03 UTC1h 2m
2026-07-21 SKW6405 - Jul 21, 00:50 UTCJul 21, 01:50 UTC1h 0m
2026-07-20 SKW4984 GJT → ORD Jul 20, 17:45 UTCJul 20, 19:10 UTC1h 25m

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?
Yes. Mode-S A9B402 is currently airborne.
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, SKW6407, SKW6229, SKW4984, SKW6218.