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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 10h ago
Flights observed
226
Distinct callsigns
20
Country
US
Last broadcast
10h ago

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
SKW6498 - 4 2026-07-12
SKW6448 SkyWest Airlines 4 2026-04-14
SKW6423 SkyWest Airlines 4 2026-05-25
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
SKW6455 SkyWest Airlines 3 2026-06-05
SKW6454 SkyWest Airlines 3 2026-05-20
SKW6444 SkyWest Airlines 3 2026-04-29
SKW6440 SkyWest Airlines 3 2026-06-15
SKW6396 SkyWest Airlines 3 2026-05-25
SKW6342 SkyWest Airlines 3 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-12 SKW6498 ORD → LEX Jul 12, 02:57 UTCJul 12, 03:54 UTC57m
2026-07-11 SKW6407 - Jul 11, 20:15 UTCJul 11, 21:30 UTC1h 15m
2026-07-11 SKW4953 - Jul 11, 14:10 UTCJul 11, 15:05 UTC55m
2026-07-11 SKW4953 - Jul 11, 12:20 UTCJul 11, 13:10 UTC50m
2026-07-11 SKW6358 MKE → ORD Jul 11, 10:20 UTCJul 11, 10:50 UTC30m
2026-07-11 SKW6358 MKE → ORD Jul 11, 10:21 UTCJul 11, 10:50 UTC29m
2026-07-06 SKW5008 - Jul 6, 20:20 UTCJul 6, 20:55 UTC35m
2026-07-06 SKW5008 DAY → ORD Jul 6, 20:16 UTCJul 6, 21:10 UTC54m
2026-07-06 SKW5008 - Jul 6, 18:30 UTCJul 6, 19:20 UTC50m
2026-07-01 SKW6498 - Jul 1, 04:10 UTCJul 1, 04:55 UTC45m
2026-07-01 SKW6498 ORD → LEX Jul 1, 04:06 UTCJul 1, 04:54 UTC48m
2026-06-30 SKW6386 - Jun 30, 18:40 UTCJun 30, 20:55 UTC2h 15m
2026-06-30 SKW4992 - Jun 30, 12:55 UTCJun 30, 13:30 UTC35m
2026-06-30 SKW4992 DFW → AUS Jun 30, 12:52 UTCJun 30, 13:25 UTC33m
2026-06-30 SKW4930 - Jun 30, 10:20 UTCJun 30, 10:50 UTC30m
2026-06-30 SKW4930 SJT → DFW Jun 30, 10:09 UTCJun 30, 10:50 UTC41m
2026-06-29 SKW9910 - Jun 29, 16:25 UTCJun 29, 18:14 UTC1h 50m
2026-06-29 SKW9910 TUS → DFW Jun 29, 15:53 UTCJun 29, 18:05 UTC2h 12m
2026-06-28 SKW9913 - Jun 28, 18:25 UTCJun 28, 20:39 UTC2h 15m
2026-06-24 SKW9910 OKC → DFW Jun 24, 18:50 UTCJun 25, 00:02 UTC5h 12m
2026-06-21 SKW273H - Jun 21, 19:24 UTCJun 21, 20:45 UTC1h 20m
2026-06-21 SKW6210 ORD → DFW Jun 21, 01:39 UTCJun 21, 14:59 UTC13h 20m
2026-06-20 SKW6245 - Jun 20, 23:10 UTCJun 21, 00:10 UTC1h 0m
2026-06-20 SKW6245 LEX → ORD Jun 20, 23:06 UTCJun 21, 00:04 UTC58m
2026-06-15 SKW6440 LEX → ORD Jun 15, 15:40 UTCJun 15, 16:24 UTC45m
2026-06-15 SKW4914 ORD → RIC Jun 15, 13:40 UTCJun 15, 14:20 UTC40m
2026-06-15 SKW6263 BNA → ORD Jun 15, 12:30 UTCJun 15, 12:45 UTC15m
2026-06-15 SKW4826 SMX → PHX Jun 15, 10:09 UTCJun 15, 11:05 UTC55m
2026-06-15 SKW4826 SMX → PHX Jun 15, 10:01 UTCJun 15, 10:59 UTC58m
2026-06-15 SKW4933 DFW → CLL Jun 15, 02:39 UTCJun 15, 03:55 UTC1h 15m
2026-06-14 SKW4989 DFW → CVG Jun 14, 21:30 UTCJun 14, 22:50 UTC1h 20m
2026-06-14 SKW4930 MLI → ORD Jun 14, 10:25 UTCJun 14, 11:05 UTC40m
2026-06-14 SKW4930 MLI → ORD Jun 14, 10:17 UTCJun 14, 11:01 UTC44m
2026-06-14 SKW6342 SJC → PHX Jun 14, 00:45 UTCJun 14, 01:50 UTC1h 5m
2026-06-14 SKW6342 SJC → PHX Jun 14, 00:43 UTCJun 14, 01:48 UTC1h 5m
2026-06-13 SKW6342 SJC → PHX Jun 13, 22:45 UTCJun 13, 23:45 UTC1h 0m
2026-06-13 SKW6340 OKC → DFW Jun 13, 16:15 UTCJun 13, 17:00 UTC45m
2026-06-12 SKW6196 LAX → DEN Jun 12, 17:55 UTCJun 12, 18:55 UTC1h 0m
2026-06-12 SKW6196 LAX → DEN Jun 12, 17:54 UTCJun 12, 18:37 UTC43m
2026-06-12 SKW4932 LAX → TUL Jun 12, 15:45 UTCJun 12, 16:40 UTC55m
2026-06-11 SKW4954 GJT → PHX Jun 11, 15:15 UTCJun 11, 16:05 UTC50m
2026-06-11 SKW4964 BNA → ORD Jun 11, 12:25 UTCJun 11, 13:40 UTC1h 15m
2026-06-11 SKW9913 ORD → DFW Jun 11, 03:00 UTCJun 11, 04:25 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.

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 10h ago.
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, SKW6498.