Apparatus

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sensors Mode-S transponder

A9F424

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N740SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9F424
Octal
52372044
Decimal
11,138,084
Country
US
Tail
N740SK
Type
CRJ7
No current signal · last broadcast 1h ago
Flights observed
682
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A9F424.

Country allocation

The ICAO 24-bit address A9F424 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
SKW6399 - 16 2026-07-18
SKW6348 - 11 2026-06-20
SKW6421 SkyWest Airlines 10 2026-06-01
SKW4950 SkyWest Airlines 9 2026-07-19
SKW6438 - 8 2026-07-17
SKW6324 SkyWest Airlines 8 2026-06-15
SKW6268 SkyWest Airlines 8 2026-04-30
SKW4965 SkyWest Airlines 8 2026-06-01
SKW4953 - 8 2026-07-17
SKW4926 - 8 2026-06-24
SKW4917 - 8 2026-06-26
SKW6437 SkyWest Airlines 7 2026-06-05
SKW6298 - 7 2026-06-15
SKW6250 - 7 2026-07-18
SKW6189 - 7 2026-06-17
SKW6472 SkyWest Airlines 6 2026-05-09
SKW6459 SkyWest Airlines 6 2026-05-28
SKW6383 SkyWest Airlines 6 2026-06-06
SKW6284 SkyWest Airlines 6 2026-07-02
SKW6253 SkyWest Airlines 6 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 SKW6363 DFW → BRO Jul 20, 11:55 UTCJul 20, 12:45 UTC50m
2026-07-20 SKW6207 SFO → LAX Jul 20, 09:50 UTCJul 20, 10:15 UTC25m
2026-07-20 SKW6193 OKC → LAX Jul 20, 03:30 UTCJul 20, 03:55 UTC25m
2026-07-20 SKW6476 ORD → COS Jul 20, 00:30 UTCJul 20, 01:10 UTC40m
2026-07-19 SKW6476 ORD → COS Jul 19, 23:10 UTCJul 19, 23:40 UTC30m
2026-07-19 SKW4950 PHX → SFO Jul 19, 20:10 UTCJul 19, 21:15 UTC1h 5m
2026-07-19 SKW4950 PHX → SFO Jul 19, 20:09 UTCJul 19, 21:07 UTC58m
2026-07-19 SKW4950 PHX → SFO Jul 19, 18:05 UTCJul 19, 18:55 UTC50m
2026-07-19 SKW6225 - Jul 19, 13:50 UTCJul 19, 15:55 UTC2h 5m
2026-07-19 SKW6225 ASE → ORD Jul 19, 13:36 UTCJul 19, 15:51 UTC2h 15m
2026-07-19 SKW6186 - Jul 19, 01:10 UTCJul 19, 03:15 UTC2h 5m
2026-07-19 SKW6186 ORD → ASE Jul 19, 01:10 UTCJul 19, 03:26 UTC2h 16m
2026-07-18 SKW6411 SFO → LAX Jul 18, 21:20 UTCJul 18, 23:45 UTC2h 25m
2026-07-18 SKW6417 DFW → ICT Jul 18, 17:10 UTCJul 18, 19:15 UTC2h 5m
2026-07-18 SKW6250 - Jul 18, 14:45 UTCJul 18, 15:50 UTC1h 5m
2026-07-18 SKW6250 MCI → ORD Jul 18, 14:39 UTCJul 18, 15:43 UTC1h 4m
2026-07-18 SKW6250 - Jul 18, 11:50 UTCJul 18, 12:45 UTC55m
2026-07-18 SKW6208 - Jul 18, 09:40 UTCJul 18, 10:10 UTC30m
2026-07-18 SKW6208 FWA → ORD Jul 18, 09:37 UTCJul 18, 10:00 UTC23m
2026-07-18 SKW6212 - Jul 18, 05:05 UTCJul 18, 05:25 UTC20m
2026-07-18 SKW6212 ORD → FWA Jul 18, 05:01 UTCJul 18, 05:29 UTC28m
2026-07-18 SKW6399 - Jul 18, 01:50 UTCJul 18, 03:00 UTC1h 11m
2026-07-18 SKW6399 MCI → ORD Jul 18, 01:47 UTCJul 18, 02:57 UTC1h 10m
2026-07-18 SKW6399 - Jul 18, 00:00 UTCJul 18, 00:55 UTC55m
2026-07-17 SKW6407 YYZ → ORD Jul 17, 20:29 UTCJul 17, 22:08 UTC1h 39m
2026-07-17 SKW6407 - Jul 17, 21:05 UTCJul 17, 22:25 UTC1h 20m
2026-07-17 SKW6407 - Jul 17, 17:25 UTCJul 17, 18:29 UTC1h 5m
2026-07-17 SKW4953 - Jul 17, 14:44 UTCJul 17, 15:29 UTC45m
2026-07-17 SKW4953 CMH → ORD Jul 17, 14:41 UTCJul 17, 15:31 UTC50m
2026-07-17 SKW4953 PWK → CMH Jul 17, 12:55 UTCJul 17, 13:45 UTC50m
2026-07-17 SKW4826 - Jul 17, 10:25 UTCJul 17, 11:10 UTC45m
2026-07-17 SKW4824 - Jul 17, 04:25 UTCJul 17, 04:59 UTC35m
2026-07-17 SKW6438 - Jul 17, 01:05 UTCJul 17, 02:39 UTC1h 35m
2026-07-17 SKW6438 ROC → ORD Jul 17, 00:58 UTCJul 17, 02:18 UTC1h 20m
2026-07-16 SKW6438 - Jul 16, 22:59 UTCJul 17, 00:14 UTC1h 15m
2026-07-16 SKW4950 - Jul 16, 20:00 UTCJul 16, 21:00 UTC1h 0m
2026-07-16 SKW4950 CMH → ORD Jul 16, 19:59 UTCJul 16, 20:57 UTC58m
2026-07-16 SKW4950 - Jul 16, 18:15 UTCJul 16, 19:05 UTC50m
2026-07-16 SKW6244 - Jul 16, 15:35 UTCJul 16, 16:44 UTC1h 10m
2026-07-16 SKW6244 LEX → ORD Jul 16, 15:29 UTCJul 16, 16:26 UTC57m
2026-07-16 SKW6244 - Jul 16, 13:34 UTCJul 16, 14:25 UTC50m
2026-07-16 SKW4914 - Jul 16, 11:20 UTCJul 16, 11:45 UTC25m
2026-07-16 SKW4914 MKE → ORD Jul 16, 11:15 UTCJul 16, 11:41 UTC26m
2026-07-16 SKW4941 - Jul 16, 00:15 UTCJul 16, 00:30 UTC15m
2026-07-15 SKW6411 - Jul 15, 19:15 UTCJul 15, 22:15 UTC3h 0m
2026-07-15 SKW6411 IDA → ORD Jul 15, 19:03 UTCJul 15, 21:33 UTC2h 30m
2026-07-15 SKW6219 - Jul 15, 15:30 UTCJul 15, 17:35 UTC2h 5m
2026-07-15 SKW6219 DFW → IDA Jul 15, 15:30 UTCJul 15, 17:43 UTC2h 13m
2026-07-14 SKW6410 AUS → DFW Jul 14, 23:50 UTCJul 15, 00:45 UTC55m
2026-07-14 SKW6410 AUS → DFW Jul 14, 23:47 UTCJul 15, 00:43 UTC56m

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 N740SK page for operator, model, and routing details .

Mode-S A9F424 frequently asked

What is Mode-S code A9F424?
A9F424 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N740SK.
Where is Mode-S A9F424 registered?
Mode-S code A9F424 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 A9F424 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9F424, octal 52372044, decimal 11,138,084.
What flights does A9F424 operate?
Mode-S A9F424 has broadcast 20 distinct callsigns, including SKW6399, SKW6348, SKW6421, SKW4950, SKW6438.