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 2h ago
Flights observed
623
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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 9 2026-05-16
SKW3076 - 9 2026-07-13
SKW3302 - 8 2026-06-25
SKW3294 SkyWest Airlines 8 2026-06-14
SKW3273 SkyWest Airlines 8 2026-04-30
SKW3473 SkyWest Airlines 7 2026-06-09
SKW3086 - 7 2026-07-14
SKW3040 SkyWest Airlines 7 2026-05-28
SKW3015 SkyWest Airlines 7 2026-06-10
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
SKW3259 SkyWest Airlines 6 2026-06-06
SKW3025 SkyWest Airlines 6 2026-07-07
SKW864W SkyWest Airlines 5 2026-06-30
SKW3490 SkyWest Airlines 5 2026-06-18
SKW3467 SkyWest Airlines 5 2026-04-16
SKW3439 SkyWest Airlines 5 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW3086 - Jul 14, 01:50 UTCJul 14, 03:00 UTC1h 10m
2026-07-13 SKW3086 - Jul 13, 23:50 UTCJul 14, 00:55 UTC1h 5m
2026-07-13 SKW3076 - Jul 13, 21:25 UTCJul 13, 22:30 UTC1h 5m
2026-07-13 SKW3049 - Jul 13, 19:20 UTCJul 13, 20:25 UTC1h 5m
2026-07-13 SKW3049 STS → LAX Jul 13, 18:53 UTCJul 13, 20:20 UTC1h 27m
2026-07-13 SKW3114 - Jul 13, 16:40 UTCJul 13, 17:45 UTC1h 5m
2026-07-13 SKW3322 - Jul 13, 13:30 UTCJul 13, 15:15 UTC1h 45m
2026-07-13 SKW3288 - Jul 13, 03:40 UTCJul 13, 05:10 UTC1h 30m
2026-07-13 SKW3221 - Jul 13, 00:50 UTCJul 13, 02:01 UTC1h 10m
2026-07-12 SKW3346 - Jul 12, 23:05 UTCJul 12, 23:55 UTC50m
2026-07-12 SKW3346 SAN → MRY Jul 12, 23:09 UTCJul 12, 23:54 UTC45m
2026-07-12 SKW3482 SFO → SAN Jul 12, 20:45 UTCJul 12, 22:05 UTC1h 20m
2026-07-12 SKW3486 - Jul 12, 18:10 UTCJul 12, 19:15 UTC1h 5m
2026-07-12 SKW3287 - Jul 12, 15:40 UTCJul 12, 17:01 UTC1h 20m
2026-07-12 SKW3086 - Jul 12, 01:50 UTCJul 12, 02:45 UTC55m
2026-07-11 SKW3086 - Jul 11, 23:40 UTCJul 12, 00:50 UTC1h 10m
2026-07-11 SKW3076 - Jul 11, 21:30 UTCJul 11, 22:35 UTC1h 5m
2026-07-11 SKW3049 - Jul 11, 18:55 UTCJul 11, 20:00 UTC1h 5m
2026-07-11 SKW3114 LAX → STS Jul 11, 16:35 UTCJul 11, 17:40 UTC1h 5m
2026-07-11 SKW3322 MFR → LAX Jul 11, 13:30 UTCJul 11, 15:20 UTC1h 50m
2026-07-11 SKW3288 - Jul 11, 03:20 UTCJul 11, 04:55 UTC1h 35m
2026-07-11 SKW3036 LAX → SFO Jul 11, 01:00 UTCJul 11, 02:15 UTC1h 15m
2026-07-10 SKW3035 GEG → SEA Jul 10, 22:35 UTCJul 10, 23:50 UTC1h 15m
2026-07-10 SKW3028 PHX → SAN Jul 10, 20:45 UTCJul 10, 21:35 UTC50m
2026-07-10 SKW3023 SFO → SEA Jul 10, 18:50 UTCJul 10, 19:50 UTC1h 0m
2026-07-10 SKW3409 SAN → STS Jul 10, 16:20 UTCJul 10, 17:15 UTC55m
2026-07-10 SKW3409 SAN → STS Jul 10, 16:04 UTCJul 10, 17:09 UTC1h 5m
2026-07-10 SKW3024 - Jul 10, 02:10 UTCJul 10, 03:35 UTC1h 25m
2026-07-10 SKW3024 PDX → FAT Jul 10, 02:23 UTCJul 10, 03:34 UTC1h 11m
2026-07-10 SKW3098 - Jul 10, 00:25 UTCJul 10, 01:20 UTC55m
2026-07-10 SKW3098 MSO → PDX Jul 10, 00:24 UTCJul 10, 01:18 UTC54m
2026-07-09 SKW3097 MRY → PHX Jul 9, 22:15 UTCJul 9, 23:05 UTC50m
2026-07-09 SKW3009 LRD → DFW Jul 9, 19:20 UTCJul 9, 20:35 UTC1h 15m
2026-07-09 SKW3400 - Jul 9, 16:55 UTCJul 9, 17:55 UTC1h 0m
2026-07-09 SKW3213 RDM → PHX Jul 9, 14:40 UTCJul 9, 15:40 UTC1h 0m
2026-07-09 SKW3410 SEA → STS Jul 9, 04:05 UTCJul 9, 05:20 UTC1h 15m
2026-07-09 SKW3410 SEA → STS Jul 9, 03:55 UTCJul 9, 05:25 UTC1h 30m
2026-07-09 SKW3372 - Jul 9, 00:35 UTCJul 9, 00:55 UTC20m
2026-07-08 SKW3118 - Jul 8, 23:05 UTCJul 8, 23:35 UTC30m
2026-07-08 SKW3360 EUG → SEA Jul 8, 21:00 UTCJul 8, 21:45 UTC45m
2026-07-08 SKW3360 SEA → EUG Jul 8, 19:25 UTCJul 8, 20:15 UTC50m
2026-07-08 SKW3284 LAX → PDX Jul 8, 15:50 UTCJul 8, 18:10 UTC2h 20m
2026-07-08 SKW3022 - Jul 8, 02:25 UTCJul 8, 04:20 UTC1h 55m
2026-07-08 SKW3202 LAX → PDX Jul 8, 00:30 UTCJul 8, 01:20 UTC50m
2026-07-07 SKW3075 STS → PSP Jul 7, 22:00 UTCJul 7, 23:35 UTC1h 35m
2026-07-07 SKW3025 DEN → SAN Jul 7, 18:25 UTCJul 7, 20:00 UTC1h 35m
2026-07-07 SKW3025 DEN → SAN Jul 7, 18:12 UTCJul 7, 19:55 UTC1h 43m
2026-07-07 SKW3393 LAX → SFO Jul 7, 14:10 UTCJul 7, 15:50 UTC1h 40m
2026-07-07 SKW3037 BNA → ORD Jul 7, 06:40 UTCJul 7, 07:35 UTC55m
2026-07-07 SKW3232 SAN → SFO Jul 7, 04:15 UTCJul 7, 05:30 UTC1h 15m

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 2h ago.
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, SKW3076, SKW3302, SKW3294, SKW3273.