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sensors Mode-S transponder

A959CF

ICAO 24-bit transponder address · allocated to United States

Hex
A959CF
Octal
52254717
Decimal
11,098,575
Country
US
No current signal · last broadcast Jul 26, 17:40 UTC
Flights observed
269
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:40 UTC

Last known position

Most recent position reported by Mode-S A959CF.

Country allocation

The ICAO 24-bit address A959CF 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
SKW4833 SkyWest Airlines 6 2026-05-08
SKW6245 - 5 2026-07-13
SKW6189 SkyWest Airlines 5 2026-05-29
SKW4942 SkyWest Airlines 5 2026-05-05
SKW4936 SkyWest Airlines 5 2026-07-22
SKW6498 - 4 2026-07-12
SKW6448 SkyWest Airlines 4 2026-04-14
SKW6423 SkyWest Airlines 4 2026-05-25
SKW6342 - 4 2026-07-17
SKW6237 SkyWest Airlines 4 2026-07-20
SKW4989 SkyWest Airlines 4 2026-06-14
SKW4986 SkyWest Airlines 4 2026-05-19
SKW4931 SkyWest Airlines 4 2026-04-26
SKW4930 - 4 2026-06-30
SKW4834 SkyWest Airlines 4 2026-05-09
SKW296Y SkyWest Airlines 4 2026-05-30
SKW9910 - 3 2026-06-29
SKW6488 - 3 2026-07-14
SKW6455 SkyWest Airlines 3 2026-06-05
SKW6454 SkyWest Airlines 3 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5007 PSC → PHX Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 SKW6208 LAX → AUS Jul 26, 09:50 UTCJul 26, 10:20 UTC30m
2026-07-26 SKW6212 PHX → SEA Jul 26, 04:00 UTCJul 26, 04:20 UTC20m
2026-07-25 SKW6493 ORD → RST Jul 25, 13:20 UTCJul 25, 15:10 UTC1h 50m
2026-07-25 SKW6487 DFW → AEX Jul 25, 00:10 UTCJul 25, 01:45 UTC1h 35m
2026-07-24 SKW6411 SFO → LAX Jul 24, 19:35 UTCJul 24, 21:40 UTC2h 5m
2026-07-24 SKW6219 LAX → DEN Jul 24, 15:20 UTCJul 24, 17:35 UTC2h 15m
2026-07-24 SKW6219 LAX → DEN Jul 24, 15:28 UTCJul 24, 17:37 UTC2h 9m
2026-07-24 SKW6302 ABQ → LAX Jul 24, 11:45 UTCJul 24, 13:10 UTC1h 25m
2026-07-24 SKW4981 PHX → CID Jul 24, 02:30 UTCJul 24, 03:50 UTC1h 20m
2026-07-24 SKW6344 PHX → SJC Jul 24, 00:24 UTCJul 24, 01:20 UTC56m
2026-07-23 SKW6446 PHX → ELP Jul 23, 17:25 UTCJul 23, 18:50 UTC1h 25m
2026-07-23 SKW6234 ORD → ICT Jul 23, 00:50 UTCJul 23, 01:20 UTC30m
2026-07-22 SKW6234 ORD → ICT Jul 22, 23:30 UTCJul 22, 23:50 UTC20m
2026-07-22 SKW4936 MSY → DFW Jul 22, 21:35 UTCJul 22, 22:25 UTC50m
2026-07-22 SKW4938 - Jul 22, 13:55 UTCJul 22, 15:05 UTC1h 10m
2026-07-21 SKW4936 MSY → DFW Jul 21, 19:10 UTCJul 21, 19:55 UTC45m
2026-07-21 SKW6195 ELP → ORD Jul 21, 11:10 UTCJul 21, 11:35 UTC25m
2026-07-21 SKW4956 DFW → SJT Jul 21, 00:40 UTCJul 21, 02:00 UTC1h 20m
2026-07-20 SKW4936 MSY → DFW Jul 20, 20:30 UTCJul 20, 21:15 UTC45m
2026-07-20 SKW4936 MSY → DFW Jul 20, 20:24 UTCJul 20, 21:14 UTC50m
2026-07-20 SKW6237 PHX → SJC Jul 20, 15:20 UTCJul 20, 15:50 UTC30m
2026-07-20 SKW6237 PHX → SJC Jul 20, 13:50 UTCJul 20, 14:15 UTC25m
2026-07-20 SKW6313 DFW → BPT Jul 20, 03:05 UTCJul 20, 03:55 UTC50m
2026-07-19 SKW6288 - Jul 19, 18:15 UTCJul 19, 19:20 UTC1h 5m
2026-07-19 SKW6288 - Jul 19, 16:15 UTCJul 19, 17:15 UTC1h 0m
2026-07-19 SKW6335 - Jul 19, 12:25 UTCJul 19, 14:15 UTC1h 50m
2026-07-19 SKW6305 DFW → SBN Jul 19, 00:50 UTCJul 19, 02:50 UTC2h 0m
2026-07-18 SKW6296 - Jul 18, 16:45 UTCJul 18, 17:50 UTC1h 5m
2026-07-17 SKW4923 DSM → ORD Jul 17, 23:14 UTCJul 17, 23:55 UTC40m
2026-07-17 SKW5002 - Jul 17, 21:20 UTCJul 17, 22:05 UTC45m
2026-07-17 SKW4963 - Jul 17, 16:49 UTCJul 17, 18:29 UTC1h 40m
2026-07-17 SKW6342 DFW → BTR Jul 17, 01:09 UTCJul 17, 02:10 UTC1h 0m
2026-07-16 SKW4936 - Jul 16, 22:45 UTCJul 16, 23:40 UTC55m
2026-07-16 SKW6237 - Jul 16, 15:25 UTCJul 16, 16:05 UTC40m
2026-07-16 SKW6237 - Jul 16, 14:00 UTCJul 16, 14:25 UTC25m
2026-07-15 SKW6205 - Jul 15, 20:00 UTCJul 15, 21:40 UTC1h 40m
2026-07-15 SKW4969 - Jul 15, 14:00 UTCJul 15, 14:55 UTC55m
2026-07-15 SKW4969 - Jul 15, 12:15 UTCJul 15, 13:00 UTC45m
2026-07-14 SKW4903 - Jul 14, 19:00 UTCJul 14, 19:30 UTC30m
2026-07-14 SKW6488 - Jul 14, 16:00 UTCJul 14, 17:05 UTC1h 5m
2026-07-14 SKW6488 YYZ → ORD Jul 14, 16:00 UTCJul 14, 17:05 UTC1h 5m
2026-07-14 SKW6488 - Jul 14, 13:55 UTCJul 14, 15:05 UTC1h 10m
2026-07-13 SKW6245 LEX → ORD Jul 13, 23:26 UTCJul 14, 00:22 UTC56m
2026-07-13 SKW6245 ORD → LEX Jul 13, 21:40 UTCJul 13, 22:35 UTC55m
2026-07-13 SKW6386 - Jul 13, 17:35 UTCJul 13, 19:45 UTC2h 10m
2026-07-13 SKW4992 DFW → AUS Jul 13, 13:10 UTCJul 13, 13:45 UTC35m
2026-07-12 SKW6205 - Jul 12, 20:25 UTCJul 12, 22:10 UTC1h 45m
2026-07-12 SKW4976 - Jul 12, 09:40 UTCJul 12, 10:40 UTC1h 0m
2026-07-12 SKW6498 - Jul 12, 03:01 UTCJul 12, 03:50 UTC50m

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.

Mode-S A959CF frequently asked

What is Mode-S code A959CF?
A959CF is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A959CF registered?
Mode-S code A959CF 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 A959CF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A959CF, octal 52254717, decimal 11,098,575.
What flights does A959CF operate?
Mode-S A959CF has broadcast 20 distinct callsigns, including SKW4833, SKW6245, SKW6189, SKW4942, SKW4936.