Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A9FF49

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N743SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9FF49
Octal
52377511
Decimal
11,140,937
Country
US
Tail
N743SK
Type
CRJ7
Transponder active on ground
Flights observed
635
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A9FF49.

Country allocation

The ICAO 24-bit address A9FF49 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
SKW4661 SkyWest Airlines 18 2026-07-22
SKW4683 SkyWest Airlines 17 2026-07-24
SKW4632 SkyWest Airlines 17 2026-07-25
SKW5883 SkyWest Airlines 16 2026-07-26
SKW5688 SkyWest Airlines 15 2026-07-24
SKW5880 SkyWest Airlines 14 2026-07-23
SKW5706 SkyWest Airlines 13 2026-07-26
SKW5578 - 13 2026-06-23
SKW4739 SkyWest Airlines 12 2026-07-24
SKW4695 SkyWest Airlines 12 2026-07-25
SKW5989 - 11 2026-07-11
SKW4720 SkyWest Airlines 11 2026-07-18
SKW463C - 11 2026-06-23
SKW5966 - 10 2026-06-23
SKW4708 - 10 2026-06-22
SKW4628 - 10 2026-07-17
SKW5753 SkyWest Airlines 9 2026-04-29
SKW5512 - 9 2026-06-23
SKW4697 SkyWest Airlines 9 2026-06-21
SKW430A SkyWest Airlines 9 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5212 LGA → ORD Jul 26, 19:35 UTCJul 26, 20:35 UTC1h 0m
2026-07-26 SKW5562 SCE → ORD Jul 26, 17:05 UTCJul 26, 18:05 UTC1h 0m
2026-07-26 SKW5236 SBP → SFO Jul 26, 14:36 UTCJul 26, 15:48 UTC1h 12m
2026-07-26 SKW5549 RDD → SFO Jul 26, 12:35 UTCJul 26, 13:15 UTC40m
2026-07-26 SKW5724 SFO → RDD Jul 26, 06:20 UTCJul 26, 06:55 UTC36m
2026-07-26 SKW5883 TVC → ORD Jul 26, 01:50 UTCJul 26, 02:55 UTC1h 5m
2026-07-26 SKW5883 TVC → ORD Jul 26, 01:49 UTCJul 26, 03:00 UTC1h 11m
2026-07-26 SKW5706 ORD → LEX Jul 26, 00:05 UTCJul 26, 00:55 UTC50m
2026-07-25 SKW5490 BHM → ORD Jul 25, 21:00 UTCJul 25, 22:35 UTC1h 35m
2026-07-25 SKW5490 BHM → ORD Jul 25, 20:47 UTCJul 25, 22:32 UTC1h 45m
2026-07-25 SKW5684 ORD → DCA Jul 25, 18:05 UTCJul 25, 19:55 UTC1h 50m
2026-07-25 SKW4632 AVL → ORD Jul 25, 15:50 UTCJul 25, 16:40 UTC50m
2026-07-25 SKW4695 CVG → ORD Jul 25, 06:33 UTCJul 25, 07:04 UTC31m
2026-07-25 SKW4695 CVG → ORD Jul 25, 06:30 UTCJul 25, 06:55 UTC25m
2026-07-25 SKW5534 RDM → SFO Jul 25, 04:00 UTCJul 25, 05:30 UTC1h 30m
2026-07-25 SKW5425 SFO → ACV Jul 25, 00:42 UTCJul 25, 01:44 UTC1h 2m
2026-07-25 SKW5425 SFO → ACV Jul 25, 00:45 UTCJul 25, 01:45 UTC1h 0m
2026-07-24 SKW5946 SLP → IAH Jul 24, 22:35 UTCJul 24, 23:35 UTC1h 0m
2026-07-24 SKW5212 LGA → ORD Jul 24, 20:30 UTCJul 24, 21:30 UTC1h 0m
2026-07-24 SKW4683 MFR → SFO Jul 24, 16:55 UTCJul 24, 18:45 UTC1h 50m
2026-07-24 SKW5688 SFO → TUS Jul 24, 07:10 UTCJul 24, 08:50 UTC1h 40m
2026-07-24 SKW5713 SFO → RDD Jul 24, 05:30 UTCJul 24, 06:00 UTC30m
2026-07-24 SKW5713 SFO → RDD Jul 24, 05:14 UTCJul 24, 05:54 UTC40m
2026-07-24 SKW5406 IAH → PHL Jul 24, 03:20 UTCJul 24, 03:55 UTC35m
2026-07-24 SKW5406 IAH → PHL Jul 24, 03:19 UTCJul 24, 03:58 UTC39m
2026-07-24 SKW4739 ORD → HSV Jul 24, 01:00 UTCJul 24, 02:25 UTC1h 25m
2026-07-24 SKW4739 ORD → HSV Jul 24, 01:04 UTCJul 24, 02:21 UTC1h 17m
2026-07-23 SKW5880 SFO → SUN Jul 23, 23:00 UTCJul 24, 00:10 UTC1h 10m
2026-07-23 SKW5880 SFO → SUN Jul 23, 22:53 UTCJul 24, 00:06 UTC1h 13m
2026-07-23 SKW5660 SFO → FAT Jul 23, 20:55 UTCJul 23, 22:00 UTC1h 5m
2026-07-23 SKW5660 SFO → FAT Jul 23, 20:27 UTCJul 23, 21:52 UTC1h 25m
2026-07-23 SKW5904 SFO → FAT Jul 23, 17:55 UTCJul 23, 18:55 UTC1h 0m
2026-07-23 SKW5904 SFO → FAT Jul 23, 17:47 UTCJul 23, 19:00 UTC1h 13m
2026-07-23 SKW4632 AVL → ORD Jul 23, 15:50 UTCJul 23, 16:45 UTC55m
2026-07-23 SKW4695 CVG → ORD Jul 23, 01:50 UTCJul 23, 02:20 UTC30m
2026-07-22 SKW4729 MRY → SFO Jul 22, 23:55 UTCJul 23, 00:15 UTC20m
2026-07-22 SKW5738 OMA → SFO Jul 22, 22:35 UTCJul 22, 22:55 UTC20m
2026-07-22 SKW4661 DEN → SJC Jul 22, 20:15 UTCJul 22, 21:40 UTC1h 25m
2026-07-22 SKW430A SFO → BOI Jul 22, 17:30 UTCJul 22, 18:40 UTC1h 10m
2026-07-22 SKW430A SFO → BOI Jul 22, 17:30 UTCJul 22, 18:39 UTC1h 9m
2026-07-22 SKW4632 AVL → ORD Jul 22, 15:30 UTCJul 22, 16:15 UTC45m
2026-07-22 SKW4695 CVG → ORD Jul 22, 01:48 UTCJul 22, 02:14 UTC26m
2026-07-22 SKW4695 CVG → ORD Jul 22, 01:35 UTCJul 22, 02:05 UTC30m
2026-07-21 SKW4739 ORD → HSV Jul 21, 23:15 UTCJul 22, 00:30 UTC1h 15m
2026-07-21 SKW5880 SFO → SUN Jul 21, 20:30 UTCJul 21, 21:30 UTC1h 0m
2026-07-21 SKW4683 MFR → SFO Jul 21, 16:50 UTCJul 21, 18:30 UTC1h 40m
2026-07-21 SKW5688 SFO → TUS Jul 21, 06:10 UTCJul 21, 07:55 UTC1h 45m
2026-07-21 SKW5883 TVC → ORD Jul 21, 03:50 UTCJul 21, 04:55 UTC1h 5m
2026-07-21 SKW5706 ORD → LEX Jul 21, 02:20 UTCJul 21, 03:05 UTC45m
2026-07-21 SKW5706 ORD → LEX Jul 21, 02:05 UTCJul 21, 03:07 UTC1h 2m

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 N743SK page for operator, model, and routing details .

Mode-S A9FF49 frequently asked

What is Mode-S code A9FF49?
A9FF49 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N743SK.
Where is Mode-S A9FF49 registered?
Mode-S code A9FF49 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 A9FF49 broadcasting right now?
Mode-S A9FF49 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9FF49, octal 52377511, decimal 11,140,937.
What flights does A9FF49 operate?
Mode-S A9FF49 has broadcast 20 distinct callsigns, including SKW4661, SKW4683, SKW4632, SKW5883, SKW5688.