Apparatus

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sensors Mode-S transponder

A4AE48

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N400SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4AE48
Octal
51127110
Decimal
10,792,520
Country
US
Tail
N400SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
742
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A4AE48.

Country allocation

The ICAO 24-bit address A4AE48 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
SKW3285 SkyWest Airlines 13 2026-07-26
SKW3033 SkyWest Airlines 10 2026-05-22
SKW3433 SkyWest Airlines 8 2026-05-11
SKW3404 - 8 2026-07-12
SKW3370 - 8 2026-07-23
SKW3131 SkyWest Airlines 8 2026-05-26
SKW3448 - 7 2026-06-29
SKW3326 SkyWest Airlines 7 2026-06-09
SKW3294 SkyWest Airlines 7 2026-07-26
SKW3251 - 7 2026-07-22
SKW3220 - 7 2026-07-14
SKW3066 SkyWest Airlines 7 2026-07-26
SKW849R - 6 2026-06-29
SKW3488 SkyWest Airlines 6 2026-05-30
SKW3450 - 6 2026-06-19
SKW3443 SkyWest Airlines 6 2026-05-23
SKW3431 - 6 2026-07-14
SKW3379 SkyWest Airlines 6 2026-05-26
SKW3372 SkyWest Airlines 6 2026-06-30
SKW3368 SkyWest Airlines 6 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3294 GEG → SEA Jul 26, 21:15 UTCJul 26, 21:40 UTC25m
2026-07-26 SKW3294 GEG → SEA Jul 26, 19:45 UTCJul 26, 20:10 UTC25m
2026-07-26 SKW3089 RNO → SEA Jul 26, 17:15 UTCJul 26, 18:40 UTC1h 25m
2026-07-26 SKW3353 RDM → SFO Jul 26, 14:10 UTCJul 26, 15:10 UTC1h 0m
2026-07-26 SKW3109 LAX → SFO Jul 26, 12:35 UTCJul 26, 13:05 UTC30m
2026-07-26 SKW3066 LAS → SAN Jul 26, 05:10 UTCJul 26, 05:35 UTC25m
2026-07-26 SKW3285 LAX → SEA Jul 26, 01:05 UTCJul 26, 02:25 UTC1h 20m
2026-07-25 SKW3285 LAX → SEA Jul 25, 22:30 UTCJul 26, 00:05 UTC1h 35m
2026-07-25 SKW3300 PSP → SEA Jul 25, 19:45 UTCJul 25, 20:25 UTC40m
2026-07-25 SKW3300 PSP → SEA Jul 25, 19:48 UTCJul 25, 20:21 UTC33m
2026-07-25 SKW3300 PSP → SEA Jul 25, 18:00 UTCJul 25, 18:50 UTC50m
2026-07-25 SKW3201 LAX → RNO Jul 25, 15:45 UTCJul 25, 16:35 UTC50m
2026-07-25 SKW3198 SAN → SMF Jul 25, 13:55 UTCJul 25, 14:40 UTC45m
2026-07-25 SKW3215 SJD → LAS Jul 25, 02:35 UTCJul 25, 03:20 UTC45m
2026-07-25 SKW3052 SFO → LAX Jul 25, 01:10 UTCJul 25, 01:50 UTC40m
2026-07-24 SKW3490 STS → SNA Jul 24, 20:45 UTCJul 25, 00:20 UTC3h 35m
2026-07-24 SKW3089 RNO → SEA Jul 24, 17:15 UTCJul 24, 18:45 UTC1h 30m
2026-07-24 SKW3353 RDM → SFO Jul 24, 14:10 UTCJul 24, 15:20 UTC1h 10m
2026-07-24 SKW3353 RDM → SFO Jul 24, 14:21 UTCJul 24, 15:18 UTC57m
2026-07-24 SKW3109 LAX → SFO Jul 24, 12:45 UTCJul 24, 13:20 UTC35m
2026-07-24 SKW3066 LAS → SAN Jul 24, 05:00 UTCJul 24, 05:30 UTC30m
2026-07-24 SKW3285 LAX → SEA Jul 24, 01:05 UTCJul 24, 02:20 UTC1h 15m
2026-07-23 SKW3285 LAX → SEA Jul 23, 22:25 UTCJul 23, 23:50 UTC1h 25m
2026-07-23 SKW3062 STS → PSP Jul 23, 20:00 UTCJul 23, 20:25 UTC25m
2026-07-23 SKW3063 LAX → PDX Jul 23, 18:20 UTCJul 23, 18:50 UTC30m
2026-07-23 SKW3370 - Jul 23, 14:35 UTCJul 23, 16:40 UTC2h 5m
2026-07-23 SKW3356 PSP → SFO Jul 23, 04:10 UTCJul 23, 05:05 UTC55m
2026-07-23 SKW3248 SJC → SEA Jul 23, 02:10 UTCJul 23, 03:15 UTC1h 5m
2026-07-22 SKW3494 SNA → SFO Jul 22, 23:05 UTCJul 23, 00:15 UTC1h 10m
2026-07-22 SKW3208 - Jul 22, 19:55 UTCJul 22, 21:50 UTC1h 55m
2026-07-22 SKW3208 JAC → SFO Jul 22, 19:39 UTCJul 22, 21:46 UTC2h 7m
2026-07-22 SKW3468 - Jul 22, 16:35 UTCJul 22, 18:05 UTC1h 30m
2026-07-22 SKW3468 SFO → JAC Jul 22, 16:31 UTCJul 22, 18:19 UTC1h 48m
2026-07-22 SKW3251 - Jul 22, 14:15 UTCJul 22, 15:15 UTC1h 0m
2026-07-22 SKW3492 SNA → SFO Jul 22, 01:25 UTCJul 22, 02:30 UTC1h 5m
2026-07-21 SKW3080 - Jul 21, 23:20 UTCJul 22, 00:20 UTC1h 0m
2026-07-21 SKW3081 - Jul 21, 21:10 UTCJul 21, 22:10 UTC1h 0m
2026-07-21 SKW3025 DEN → SAN Jul 21, 18:40 UTCJul 21, 20:05 UTC1h 25m
2026-07-21 SKW3393 LAX → SFO Jul 21, 14:10 UTCJul 21, 15:55 UTC1h 45m
2026-07-21 SKW3037 BNA → ORD Jul 21, 05:45 UTCJul 21, 06:40 UTC55m
2026-07-21 SKW3232 SAN → SFO Jul 21, 03:30 UTCJul 21, 04:45 UTC1h 15m
2026-07-21 SKW3036 LAX → SFO Jul 21, 00:50 UTCJul 21, 02:05 UTC1h 15m
2026-07-20 SKW3035 GEG → SEA Jul 20, 22:47 UTCJul 20, 23:36 UTC49m
2026-07-20 SKW3035 GEG → SEA Jul 20, 22:30 UTCJul 20, 23:45 UTC1h 15m
2026-07-20 SKW3028 PHX → SAN Jul 20, 20:50 UTCJul 20, 21:40 UTC50m
2026-07-20 SKW3023 SFO → SEA Jul 20, 18:34 UTCJul 20, 19:35 UTC1h 1m
2026-07-20 SKW3023 SFO → SEA Jul 20, 18:40 UTCJul 20, 19:40 UTC1h 0m
2026-07-20 SKW3409 - Jul 20, 16:30 UTCJul 20, 17:25 UTC55m
2026-07-20 SKW847E - Jul 20, 05:15 UTCJul 20, 06:00 UTC45m
2026-07-19 SKW3475 SJC → AUS Jul 19, 19:15 UTCJul 20, 03:15 UTC8h 0m

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 N400SY page for operator, model, and routing details .

Mode-S A4AE48 frequently asked

What is Mode-S code A4AE48?
A4AE48 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N400SY.
Where is Mode-S A4AE48 registered?
Mode-S code A4AE48 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 A4AE48 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4AE48, octal 51127110, decimal 10,792,520.
What flights does A4AE48 operate?
Mode-S A4AE48 has broadcast 20 distinct callsigns, including SKW3285, SKW3033, SKW3433, SKW3404, SKW3370.