Apparatus

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sensors Mode-S transponder

A4CC00

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N408SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4CC00
Octal
51146000
Decimal
10,800,128
Country
US
Tail
N408SY
Type
E75L
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
708
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A4CC00.

Country allocation

The ICAO 24-bit address A4CC00 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
SKW3450 SkyWest Airlines 10 2026-07-23
SKW3433 - 10 2026-07-19
SKW3076 - 10 2026-07-20
SKW3086 SkyWest Airlines 9 2026-07-21
SKW3302 - 8 2026-06-25
SKW3294 SkyWest Airlines 8 2026-06-14
SKW3273 SkyWest Airlines 8 2026-04-30
SKW3015 SkyWest Airlines 8 2026-07-26
SKW3473 SkyWest Airlines 7 2026-06-09
SKW3360 - 7 2026-07-18
SKW3040 SkyWest Airlines 7 2026-05-28
SKW3006 SkyWest Airlines 7 2026-07-26
SKW3482 - 6 2026-07-21
SKW3467 SkyWest Airlines 6 2026-07-23
SKW3439 SkyWest Airlines 6 2026-07-26
SKW3434 SkyWest Airlines 6 2026-05-15
SKW3368 SkyWest Airlines 6 2026-05-08
SKW3337 - 6 2026-06-29
SKW3319 SkyWest Airlines 6 2026-05-27
SKW3292 - 6 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3439 STS → SAN Jul 26, 20:50 UTCJul 26, 22:00 UTC1h 10m
2026-07-26 SKW833K SAN → SMF Jul 26, 18:30 UTCJul 26, 19:40 UTC1h 10m
2026-07-26 SKW3015 SJC → LAX Jul 26, 15:50 UTCJul 26, 17:05 UTC1h 15m
2026-07-26 SKW3006 SEA → SFO Jul 26, 03:45 UTCJul 26, 04:55 UTC1h 10m
2026-07-26 SKW3006 SEA → SFO Jul 26, 03:34 UTCJul 26, 04:54 UTC1h 20m
2026-07-26 SKW3019 SLC → ORD Jul 26, 00:35 UTCJul 26, 02:25 UTC1h 50m
2026-07-25 SKW3120 RNO → PDX Jul 25, 21:55 UTCJul 25, 23:25 UTC1h 30m
2026-07-25 SKW3045 ORD → HPN Jul 25, 19:05 UTCJul 25, 20:15 UTC1h 10m
2026-07-25 SKW3055 LAX → LAS Jul 25, 16:35 UTCJul 25, 18:10 UTC1h 35m
2026-07-25 SKW3417 LAX → SFO Jul 25, 14:10 UTCJul 25, 15:15 UTC1h 5m
2026-07-25 SKW3410 PSP → SFO Jul 25, 04:25 UTCJul 25, 06:15 UTC1h 50m
2026-07-24 SKW3498 SAN → FCA Jul 24, 22:55 UTCJul 25, 03:05 UTC4h 10m
2026-07-24 SKW3489 MRY → SAN Jul 24, 20:35 UTCJul 24, 21:45 UTC1h 10m
2026-07-24 SKW3013 PHX → SJC Jul 24, 17:55 UTCJul 24, 18:55 UTC1h 0m
2026-07-24 SKW3013 PHX → SJC Jul 24, 17:57 UTCJul 24, 19:08 UTC1h 11m
2026-07-24 SKW3132 BOI → SFO Jul 24, 16:20 UTCJul 24, 16:55 UTC35m
2026-07-24 SKW3385 - Jul 24, 13:35 UTCJul 24, 14:00 UTC25m
2026-07-24 SKW3102 LAX → SFO Jul 24, 04:50 UTCJul 24, 05:20 UTC30m
2026-07-24 SKW3048 PDX → SEA Jul 24, 02:45 UTCJul 24, 03:35 UTC50m
2026-07-23 SKW3107 SJC → SAN Jul 23, 23:35 UTCJul 24, 01:10 UTC1h 35m
2026-07-23 SKW3092 SAN → SJC Jul 23, 21:35 UTCJul 23, 22:40 UTC1h 5m
2026-07-23 SKW3467 FCA → LAX Jul 23, 18:55 UTCJul 23, 20:10 UTC1h 15m
2026-07-23 SKW3450 SNA → SFO Jul 23, 16:45 UTCJul 23, 17:45 UTC1h 0m
2026-07-23 SKW3497 LAX → PDX Jul 23, 14:40 UTCJul 23, 15:40 UTC1h 0m
2026-07-23 SKW3214 SJC → LAX Jul 23, 05:50 UTCJul 23, 08:00 UTC2h 10m
2026-07-22 SKW3345 - Jul 22, 22:25 UTCJul 22, 23:20 UTC55m
2026-07-22 SKW3345 ACV → SEA Jul 22, 22:20 UTCJul 22, 23:14 UTC54m
2026-07-22 SKW3220 LAX → EUG Jul 22, 19:50 UTCJul 22, 21:00 UTC1h 10m
2026-07-22 SKW3431 SJC → PSP Jul 22, 17:50 UTCJul 22, 18:15 UTC25m
2026-07-22 SKW3105 LAX → SFO Jul 22, 15:40 UTCJul 22, 16:25 UTC45m
2026-07-22 SKW3106 SAN → SJC Jul 22, 04:40 UTCJul 22, 05:20 UTC40m
2026-07-22 SKW3280 PSP → SFO Jul 22, 02:22 UTCJul 22, 03:29 UTC1h 7m
2026-07-22 SKW3280 PSP → SFO Jul 22, 02:05 UTCJul 22, 03:35 UTC1h 30m
2026-07-21 SKW3488 SJC → PDX Jul 21, 23:50 UTCJul 22, 01:20 UTC1h 30m
2026-07-21 SKW3482 SFO → SAN Jul 21, 21:30 UTCJul 21, 22:45 UTC1h 15m
2026-07-21 SKW3482 SFO → SAN Jul 21, 21:28 UTCJul 21, 22:38 UTC1h 10m
2026-07-21 SKW3486 BOI → SFO Jul 21, 19:15 UTCJul 21, 20:25 UTC1h 10m
2026-07-21 SKW3287 - Jul 21, 15:40 UTCJul 21, 17:00 UTC1h 20m
2026-07-21 SKW3086 GRK → DFW Jul 21, 01:50 UTCJul 21, 02:55 UTC1h 5m
2026-07-20 SKW3086 GRK → DFW Jul 20, 23:45 UTCJul 21, 00:55 UTC1h 10m
2026-07-20 SKW3076 - Jul 20, 21:20 UTCJul 20, 22:25 UTC1h 5m
2026-07-20 SKW3049 - Jul 20, 19:20 UTCJul 20, 20:25 UTC1h 5m
2026-07-20 SKW3114 - Jul 20, 16:10 UTCJul 20, 17:10 UTC1h 0m
2026-07-20 SKW3322 - Jul 20, 13:20 UTCJul 20, 15:00 UTC1h 40m
2026-07-20 SKW3206 SAN → MFR Jul 20, 03:10 UTCJul 20, 05:15 UTC2h 5m
2026-07-20 SKW3019 - Jul 20, 00:15 UTCJul 20, 01:45 UTC1h 30m
2026-07-19 SKW3120 RNO → PDX Jul 19, 21:50 UTCJul 19, 23:20 UTC1h 30m
2026-07-19 SKW3121 - Jul 19, 19:20 UTCJul 19, 20:30 UTC1h 10m
2026-07-19 SKW3110 LAX → SJC Jul 19, 16:45 UTCJul 19, 18:05 UTC1h 20m
2026-07-19 SKW3018 SLC → SAN Jul 19, 14:10 UTCJul 19, 15:40 UTC1h 30m

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 N408SY page for operator, model, and routing details .

Mode-S A4CC00 frequently asked

What is Mode-S code A4CC00?
A4CC00 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N408SY.
Where is Mode-S A4CC00 registered?
Mode-S code A4CC00 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 A4CC00 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CC00, octal 51146000, decimal 10,800,128.
What flights does A4CC00 operate?
Mode-S A4CC00 has broadcast 20 distinct callsigns, including SKW3450, SKW3433, SKW3076, SKW3086, SKW3302.