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
Broadcasting now · callsign SKW4992 · 21,900 ft
Flights observed
735
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 14:50 UTC

Current position

A9F424 is currently broadcasting. Map zoomed to live position.

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
SKW6229 SkyWest Airlines 9 2026-07-23
SKW4950 SkyWest Airlines 9 2026-07-19
SKW4926 SkyWest Airlines 9 2026-07-25
SKW6438 - 8 2026-07-17
SKW6324 SkyWest Airlines 8 2026-06-15
SKW6268 SkyWest Airlines 8 2026-04-30
SKW6256 - 8 2026-07-22
SKW4965 SkyWest Airlines 8 2026-06-01
SKW4953 - 8 2026-07-17
SKW4917 - 8 2026-06-26
SKW6437 SkyWest Airlines 7 2026-06-05
SKW6298 - 7 2026-06-15
SKW6284 SkyWest Airlines 7 2026-07-23
SKW6250 - 7 2026-07-18
SKW6189 - 7 2026-06-17
SKW6472 SkyWest Airlines 6 2026-05-09
SKW6459 SkyWest Airlines 6 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6503 ORD → RST Jul 26, 13:25 UTCJul 26, 14:50 UTC1h 25m
2026-07-26 SKW6192 PHX → SEA Jul 26, 00:20 UTCJul 26, 01:40 UTC1h 20m
2026-07-26 SKW6192 PHX → SEA Jul 26, 00:15 UTCJul 26, 01:54 UTC1h 39m
2026-07-25 SKW5006 ORD → TVC Jul 25, 22:05 UTCJul 25, 23:00 UTC55m
2026-07-25 SKW5006 ORD → TVC Jul 25, 22:03 UTCJul 25, 22:55 UTC52m
2026-07-25 SKW5006 ORD → TVC Jul 25, 19:50 UTCJul 25, 20:45 UTC55m
2026-07-25 SKW4918 DFW → TXK Jul 25, 17:15 UTCJul 25, 18:45 UTC1h 30m
2026-07-25 SKW4918 DFW → TXK Jul 25, 14:20 UTCJul 25, 15:50 UTC1h 30m
2026-07-25 SKW4926 SWO → DFW Jul 25, 11:15 UTCJul 25, 12:00 UTC45m
2026-07-25 SKW4961 MLI → ORD Jul 25, 04:55 UTCJul 25, 05:40 UTC45m
2026-07-25 SKW4961 MLI → ORD Jul 25, 04:53 UTCJul 25, 05:36 UTC43m
2026-07-25 SKW4996 AUS → PHX Jul 25, 02:10 UTCJul 25, 03:45 UTC1h 35m
2026-07-25 SKW4996 AUS → PHX Jul 25, 02:03 UTCJul 25, 03:45 UTC1h 42m
2026-07-24 SKW4996 AUS → PHX Jul 24, 22:55 UTCJul 25, 00:45 UTC1h 50m
2026-07-24 SKW4907 ORD → CLE Jul 24, 20:35 UTCJul 24, 21:00 UTC25m
2026-07-24 SKW4907 ORD → CLE Jul 24, 20:31 UTCJul 24, 21:23 UTC52m
2026-07-24 SKW9911 PSP → FAT Jul 24, 19:05 UTCJul 24, 19:45 UTC40m
2026-07-24 SKW9911 PSP → FAT Jul 24, 16:53 UTCJul 24, 19:45 UTC2h 52m
2026-07-24 SKW6345 DFW → HRL Jul 24, 14:05 UTCJul 24, 15:35 UTC1h 30m
2026-07-24 SKW6345 DFW → HRL Jul 24, 13:51 UTCJul 24, 15:28 UTC1h 37m
2026-07-24 SKW6186 ORD → IAH Jul 24, 01:05 UTCJul 24, 03:10 UTC2h 5m
2026-07-23 SKW6229 MLI → ORD Jul 23, 22:50 UTCJul 23, 23:25 UTC35m
2026-07-23 SKW6229 MLI → ORD Jul 23, 22:31 UTCJul 23, 23:21 UTC50m
2026-07-23 SKW6229 MLI → ORD Jul 23, 20:55 UTCJul 23, 21:20 UTC25m
2026-07-23 SKW4831 - Jul 23, 17:55 UTCJul 23, 19:15 UTC1h 20m
2026-07-23 SKW4831 SHD → ORD Jul 23, 17:52 UTCJul 23, 19:17 UTC1h 25m
2026-07-23 SKW4828 - Jul 23, 16:30 UTCJul 23, 17:05 UTC35m
2026-07-23 SKW6450 - Jul 23, 12:35 UTCJul 23, 14:15 UTC1h 40m
2026-07-23 SKW6450 SHV → CLT Jul 23, 12:29 UTCJul 23, 14:22 UTC1h 53m
2026-07-23 SKW6284 LAX → SFO Jul 23, 00:00 UTCJul 23, 00:40 UTC40m
2026-07-22 SKW6256 - Jul 22, 20:50 UTCJul 22, 21:30 UTC40m
2026-07-22 SKW6256 SWO → DFW Jul 22, 20:53 UTCJul 22, 21:28 UTC35m
2026-07-22 SKW6256 - Jul 22, 19:15 UTCJul 22, 19:50 UTC35m
2026-07-22 SKW6343 DAY → ORD Jul 22, 15:35 UTCJul 22, 16:15 UTC40m
2026-07-22 SKW6343 DAY → ORD Jul 22, 15:24 UTCJul 22, 16:05 UTC41m
2026-07-22 SKW6343 DAY → ORD Jul 22, 13:35 UTCJul 22, 14:15 UTC40m
2026-07-22 SKW6195 ELP → ORD Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 SKW6195 ELP → ORD Jul 22, 11:04 UTCJul 22, 11:39 UTC35m
2026-07-22 SKW4999 BPT → DFW Jul 22, 04:15 UTCJul 22, 04:40 UTC25m
2026-07-22 SKW4999 BPT → DFW Jul 22, 04:11 UTCJul 22, 04:40 UTC29m
2026-07-21 SKW4956 DFW → SJT Jul 21, 23:30 UTCJul 22, 00:50 UTC1h 20m
2026-07-21 SKW4956 DFW → SJT Jul 21, 21:00 UTCJul 21, 22:30 UTC1h 30m
2026-07-21 SKW6194 LAX → OKC Jul 21, 18:00 UTCJul 21, 19:35 UTC1h 35m
2026-07-21 SKW6194 LAX → OKC Jul 21, 15:15 UTCJul 21, 17:00 UTC1h 45m
2026-07-21 SKW6197 LNK → DFW Jul 21, 11:55 UTCJul 21, 13:15 UTC1h 20m
2026-07-21 SKW6287 LAX → SEA Jul 21, 04:25 UTCJul 21, 05:40 UTC1h 15m
2026-07-21 SKW6287 LAX → SEA Jul 21, 04:36 UTCJul 21, 05:39 UTC1h 3m
2026-07-21 SKW6285 LAX → SLC Jul 21, 00:05 UTCJul 21, 01:45 UTC1h 40m
2026-07-20 SKW6285 LAX → SLC Jul 20, 21:40 UTCJul 20, 23:10 UTC1h 30m
2026-07-20 SKW6249 PHX → GJT Jul 20, 18:50 UTCJul 20, 20:00 UTC1h 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 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?
Yes. Mode-S A9F424 is currently airborne.
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, SKW6229, SKW4950.