Apparatus

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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
No current signal · last broadcast 7h ago
Flights observed
541
Distinct callsigns
20
Country
US
Last broadcast
7h ago

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 - 15 2026-07-13
SKW5578 - 13 2026-06-23
SKW4632 - 13 2026-07-13
SKW5688 - 12 2026-07-14
SKW4683 - 12 2026-07-12
SKW5989 - 11 2026-07-11
SKW463C - 11 2026-06-23
SKW5966 - 10 2026-06-23
SKW4720 - 10 2026-07-11
SKW4708 - 10 2026-06-22
SKW5880 - 9 2026-07-12
SKW5753 SkyWest Airlines 9 2026-04-29
SKW5512 - 9 2026-06-23
SKW4697 SkyWest Airlines 9 2026-06-21
SKW5883 - 8 2026-07-03
SKW5480 - 8 2026-06-18
SKW4628 SkyWest Airlines 8 2026-06-28
SKW5818 - 7 2026-07-10
SKW5706 - 7 2026-07-03
SKW4739 - 7 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW5688 - Jul 14, 05:15 UTCJul 14, 07:00 UTC1h 45m
2026-07-14 SKW5688 SFO → TUS Jul 14, 05:23 UTCJul 14, 07:00 UTC1h 37m
2026-07-14 SKW5624 - Jul 14, 03:10 UTCJul 14, 04:10 UTC1h 0m
2026-07-14 SKW5613 - Jul 14, 00:10 UTCJul 14, 01:10 UTC1h 0m
2026-07-14 SKW5613 SFO → ONT Jul 14, 00:05 UTCJul 14, 01:11 UTC1h 6m
2026-07-13 SKW4661 - Jul 13, 21:30 UTCJul 13, 22:15 UTC45m
2026-07-13 SKW4661 BOI → SFO Jul 13, 21:22 UTCJul 13, 22:48 UTC1h 26m
2026-07-13 SKW430A - Jul 13, 18:15 UTCJul 13, 19:25 UTC1h 10m
2026-07-13 SKW4632 - Jul 13, 16:10 UTCJul 13, 17:00 UTC50m
2026-07-13 SKW4695 - Jul 13, 06:50 UTCJul 13, 07:20 UTC30m
2026-07-13 SKW4695 SFO → ACV Jul 13, 06:40 UTCJul 13, 07:45 UTC1h 5m
2026-07-13 SKW5704 - Jul 13, 04:55 UTCJul 13, 05:40 UTC45m
2026-07-13 SKW5962 - Jul 13, 01:30 UTCJul 13, 02:20 UTC50m
2026-07-12 SKW4739 - Jul 12, 22:55 UTCJul 13, 00:25 UTC1h 30m
2026-07-12 SKW4739 RDM → SFO Jul 12, 22:54 UTCJul 13, 00:24 UTC1h 30m
2026-07-12 SKW5880 - Jul 12, 20:35 UTCJul 12, 21:35 UTC1h 0m
2026-07-12 SKW4683 - Jul 12, 16:45 UTCJul 12, 18:35 UTC1h 50m
2026-07-12 SKW5688 - Jul 12, 04:55 UTCJul 12, 06:45 UTC1h 50m
2026-07-12 SKW5349 - Jul 12, 02:10 UTCJul 12, 02:40 UTC30m
2026-07-11 SKW4806 - Jul 11, 22:25 UTCJul 12, 00:15 UTC1h 50m
2026-07-11 SKW4806 DEN → FAT Jul 11, 22:24 UTCJul 12, 00:20 UTC1h 56m
2026-07-11 SKW4720 SLC → DEN Jul 11, 19:20 UTCJul 11, 20:30 UTC1h 10m
2026-07-11 SKW4720 SLC → DEN Jul 11, 19:25 UTCJul 11, 20:37 UTC1h 12m
2026-07-11 SKW5605 - Jul 11, 16:50 UTCJul 11, 18:10 UTC1h 20m
2026-07-11 SKW5605 SFO → SLC Jul 11, 16:56 UTCJul 11, 18:09 UTC1h 13m
2026-07-11 SKW5313 - Jul 11, 13:35 UTCJul 11, 14:15 UTC40m
2026-07-11 SKW4695 - Jul 11, 07:10 UTCJul 11, 07:35 UTC25m
2026-07-11 SKW4695 SFO → ACV Jul 11, 07:04 UTCJul 11, 07:46 UTC42m
2026-07-11 SKW6085 DEN → SFO Jul 11, 03:50 UTCJul 11, 06:01 UTC2h 10m
2026-07-11 SKW6085 DEN → SFO Jul 11, 03:33 UTCJul 11, 06:02 UTC2h 29m
2026-07-11 SKW5989 - Jul 11, 02:05 UTCJul 11, 02:30 UTC25m
2026-07-11 SKW5989 BFF → DEN Jul 11, 01:56 UTCJul 11, 02:37 UTC41m
2026-07-10 SKW5989 - Jul 10, 22:25 UTCJul 11, 00:30 UTC2h 5m
2026-07-10 SKW5421 - Jul 10, 20:15 UTCJul 10, 21:10 UTC55m
2026-07-10 SKW4675 COS → DEN Jul 10, 17:50 UTCJul 10, 18:15 UTC25m
2026-07-10 SKW5306 DEN → COS Jul 10, 16:05 UTCJul 10, 16:25 UTC20m
2026-07-10 SKW5818 - Jul 10, 13:20 UTCJul 10, 14:00 UTC40m
2026-07-10 SKW5818 CPR → DEN Jul 10, 13:26 UTCJul 10, 14:12 UTC46m
2026-07-10 SKW5226 - Jul 10, 03:55 UTCJul 10, 04:30 UTC35m
2026-07-10 SKW4758 - Jul 10, 01:10 UTCJul 10, 02:20 UTC1h 10m
2026-07-09 SKW5498 - Jul 9, 22:50 UTCJul 10, 00:05 UTC1h 15m
2026-07-09 SKW5541 - Jul 9, 18:55 UTCJul 9, 20:30 UTC1h 35m
2026-07-09 SKW5541 SGF → DEN Jul 9, 18:48 UTCJul 9, 20:33 UTC1h 45m
2026-07-09 SKW5481 - Jul 9, 16:30 UTCJul 9, 17:45 UTC1h 15m
2026-07-09 SKW5818 - Jul 9, 13:20 UTCJul 9, 14:00 UTC40m
2026-07-09 SKW5818 CPR → DEN Jul 9, 13:23 UTCJul 9, 13:53 UTC30m
2026-07-09 SKW5226 - Jul 9, 03:50 UTCJul 9, 04:15 UTC25m
2026-07-09 SKW5226 DEN → CPR Jul 9, 03:22 UTCJul 9, 04:45 UTC1h 23m
2026-07-09 SKW4758 - Jul 9, 01:20 UTCJul 9, 01:45 UTC25m
2026-07-09 SKW4758 BIL → DEN Jul 9, 00:32 UTCJul 9, 01:28 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 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?
No active broadcast right now. Last signal was 7h ago.
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, SKW5578, SKW4632, SKW5688, SKW4683.