Apparatus

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sensors Mode-S transponder

A4BD24

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N404SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4BD24
Octal
51136444
Decimal
10,796,324
Country
US
Tail
N404SY
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
545
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A4BD24.

Country allocation

The ICAO 24-bit address A4BD24 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
SKW3433 - 8 2026-07-15
SKW3075 SkyWest Airlines 7 2026-07-23
SKW3393 SkyWest Airlines 6 2026-07-23
SKW3341 SkyWest Airlines 6 2026-06-01
SKW3313 - 6 2026-07-19
SKW3025 SkyWest Airlines 6 2026-07-23
SKW3466 - 5 2026-07-10
SKW3464 - 5 2026-07-13
SKW3426 SkyWest Airlines 5 2026-06-16
SKW3417 SkyWest Airlines 5 2026-06-13
SKW3370 SkyWest Airlines 5 2026-06-24
SKW3369 SkyWest Airlines 5 2026-07-03
SKW3360 - 5 2026-07-14
SKW3352 - 5 2026-07-18
SKW3064 SkyWest Airlines 5 2026-07-22
SKW3027 SkyWest Airlines 5 2026-07-26
SKW3017 - 5 2026-06-30
SKW3497 - 4 2026-06-25
SKW3431 SkyWest Airlines 4 2026-07-04
SKW3416 SkyWest Airlines 4 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3490 STS → SNA Jul 26, 20:00 UTCJul 26, 23:00 UTC3h 0m
2026-07-26 SKW3100 SBA → PHX Jul 26, 17:45 UTCJul 26, 18:45 UTC1h 0m
2026-07-26 SKW3101 FWA → DFW Jul 26, 15:40 UTCJul 26, 16:25 UTC45m
2026-07-26 SKW3101 FWA → DFW Jul 26, 15:26 UTCJul 26, 16:30 UTC1h 4m
2026-07-26 SKW3026 SEA → IDA Jul 26, 13:10 UTCJul 26, 14:00 UTC50m
2026-07-26 SKW3027 SEA → FAT Jul 26, 03:00 UTCJul 26, 03:50 UTC50m
2026-07-26 SKW3372 PDX → SJC Jul 26, 00:40 UTCJul 26, 01:05 UTC25m
2026-07-25 SKW3118 RNO → SEA Jul 25, 22:55 UTCJul 25, 23:25 UTC30m
2026-07-25 SKW3294 GEG → SEA Jul 25, 21:05 UTCJul 25, 21:30 UTC25m
2026-07-25 SKW3294 GEG → SEA Jul 25, 19:40 UTCJul 25, 20:05 UTC25m
2026-07-25 SKW3089 RNO → SEA Jul 25, 16:50 UTCJul 25, 18:15 UTC1h 25m
2026-07-25 SKW3353 RDM → SFO Jul 25, 14:05 UTCJul 25, 15:05 UTC1h 0m
2026-07-25 SKW3109 LAX → SFO Jul 25, 12:30 UTCJul 25, 13:05 UTC35m
2026-07-25 SKW3109 LAX → SFO Jul 25, 12:44 UTCJul 25, 13:02 UTC18m
2026-07-25 SKW3066 LAS → SAN Jul 25, 05:05 UTCJul 25, 05:35 UTC30m
2026-07-25 SKW3285 LAX → SEA Jul 25, 01:10 UTCJul 25, 02:25 UTC1h 15m
2026-07-24 SKW3285 LAX → SEA Jul 24, 22:20 UTCJul 24, 23:55 UTC1h 35m
2026-07-24 SKW3074 LAX → SFO Jul 24, 19:50 UTCJul 24, 20:25 UTC35m
2026-07-24 SKW3074 LAX → SFO Jul 24, 19:55 UTCJul 24, 20:20 UTC25m
2026-07-24 SKW3073 SAN → EUG Jul 24, 18:15 UTCJul 24, 18:50 UTC35m
2026-07-24 SKW3004 SJC → PHX Jul 24, 14:35 UTCJul 24, 16:15 UTC1h 40m
2026-07-24 SKW3291 DFW → ASE Jul 24, 01:50 UTCJul 24, 03:45 UTC1h 55m
2026-07-24 SKW3291 DFW → ASE Jul 24, 02:00 UTCJul 24, 03:21 UTC1h 21m
2026-07-24 SKW3202 LAX → PDX Jul 24, 00:05 UTCJul 24, 00:55 UTC50m
2026-07-23 SKW3075 STS → PSP Jul 23, 21:30 UTCJul 23, 23:10 UTC1h 40m
2026-07-23 SKW3025 DEN → SAN Jul 23, 18:30 UTCJul 23, 20:00 UTC1h 30m
2026-07-23 SKW3393 LAX → SFO Jul 23, 14:35 UTCJul 23, 16:10 UTC1h 35m
2026-07-23 SKW3037 BNA → ORD Jul 23, 06:15 UTCJul 23, 07:15 UTC1h 0m
2026-07-23 SKW3232 SAN → SFO Jul 23, 03:55 UTCJul 23, 05:05 UTC1h 10m
2026-07-23 SKW3337 SAN → SFO Jul 23, 01:10 UTCJul 23, 02:25 UTC1h 15m
2026-07-22 SKW3064 COS → DFW Jul 22, 21:35 UTCJul 22, 23:00 UTC1h 25m
2026-07-22 SKW3365 - Jul 22, 18:25 UTCJul 22, 20:05 UTC1h 40m
2026-07-22 SKW3365 LAX → RDM Jul 22, 18:27 UTCJul 22, 19:56 UTC1h 29m
2026-07-22 SKW3304 SEA → SFO Jul 22, 14:10 UTCJul 22, 16:10 UTC2h 0m
2026-07-22 SKW3303 AUS → LAX Jul 22, 03:00 UTCJul 22, 04:45 UTC1h 45m
2026-07-21 SKW3404 SNA → SFO Jul 21, 17:55 UTCJul 22, 00:50 UTC6h 55m
2026-07-21 SKW3304 SEA → SFO Jul 21, 14:15 UTCJul 21, 16:15 UTC2h 0m
2026-07-21 SKW3066 LAS → SAN Jul 21, 04:55 UTCJul 21, 05:25 UTC30m
2026-07-21 SKW3280 PSP → SFO Jul 21, 02:10 UTCJul 21, 03:40 UTC1h 30m
2026-07-20 SKW3488 SJC → PDX Jul 20, 23:20 UTCJul 21, 00:55 UTC1h 34m
2026-07-20 SKW3488 SJC → PDX Jul 20, 23:19 UTCJul 21, 00:50 UTC1h 31m
2026-07-20 SKW3439 STS → SAN Jul 20, 20:49 UTCJul 20, 21:50 UTC1h 1m
2026-07-20 SKW3439 STS → SAN Jul 20, 20:40 UTCJul 20, 21:55 UTC1h 15m
2026-07-20 SKW833K SAN → SMF Jul 20, 18:25 UTCJul 20, 19:40 UTC1h 15m
2026-07-20 SKW833K - Jul 20, 18:30 UTCJul 20, 19:40 UTC1h 10m
2026-07-20 SKW3015 SMF → SAN Jul 20, 15:45 UTCJul 20, 17:00 UTC1h 15m
2026-07-20 SKW3006 SEA → SFO Jul 20, 03:25 UTCJul 20, 04:35 UTC1h 10m
2026-07-20 SKW3036 LAX → SFO Jul 20, 00:56 UTCJul 20, 02:15 UTC1h 19m
2026-07-20 SKW3036 LAX → SFO Jul 20, 01:05 UTCJul 20, 02:30 UTC1h 25m
2026-07-19 SKW3035 GEG → SEA Jul 19, 22:38 UTCJul 19, 23:43 UTC1h 5m

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 N404SY page for operator, model, and routing details .

Mode-S A4BD24 frequently asked

What is Mode-S code A4BD24?
A4BD24 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N404SY.
Where is Mode-S A4BD24 registered?
Mode-S code A4BD24 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 A4BD24 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BD24, octal 51136444, decimal 10,796,324.
What flights does A4BD24 operate?
Mode-S A4BD24 has broadcast 20 distinct callsigns, including SKW3433, SKW3075, SKW3393, SKW3341, SKW3313.