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sensors Mode-S transponder

A4B5B6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N402SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4B5B6
Octal
51132666
Decimal
10,794,422
Country
US
Tail
N402SY
Type
E75L
Broadcasting now · callsign SKW3007 · 25,600 ft
Flights observed
536
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Current position

A4B5B6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4B5B6 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
SKW3404 SkyWest Airlines 9 2026-06-04
SKW3398 - 9 2026-07-09
SKW3450 SkyWest Airlines 8 2026-06-13
SKW3360 - 8 2026-07-12
SKW3328 SkyWest Airlines 7 2026-06-05
SKW3251 - 7 2026-07-01
SKW3115 - 7 2026-07-07
SKW3349 - 6 2026-07-07
SKW3294 - 6 2026-07-11
SKW833K - 5 2026-06-16
SKW3499 SkyWest Airlines 5 2026-07-24
SKW3482 - 5 2026-07-19
SKW3439 - 5 2026-06-16
SKW3372 - 5 2026-07-17
SKW3323 SkyWest Airlines 5 2026-07-10
SKW3131 SkyWest Airlines 5 2026-07-24
SKW3118 - 5 2026-07-17
SKW3112 - 5 2026-07-06
SKW3455 - 4 2026-06-27
SKW3438 - 4 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3218 CVG → ORD Jul 26, 19:50 UTCJul 26, 20:55 UTC1h 5m
2026-07-26 SKW3059 SJC → LAX Jul 26, 17:20 UTCJul 26, 18:30 UTC1h 10m
2026-07-26 SKW864W SAN → SJC Jul 26, 15:30 UTCJul 26, 16:30 UTC1h 0m
2026-07-26 SKW3249 SEA → SJC Jul 26, 01:30 UTCJul 26, 03:55 UTC2h 25m
2026-07-25 SKW3250 PDX → LAX Jul 25, 21:25 UTCJul 26, 00:00 UTC2h 35m
2026-07-25 SKW3047 DTW → ORD Jul 25, 18:20 UTCJul 25, 19:35 UTC1h 15m
2026-07-25 SKW3233 PHX → OKC Jul 25, 15:30 UTCJul 25, 16:45 UTC1h 15m
2026-07-25 SKW3402 SFO → LAX Jul 25, 13:20 UTCJul 25, 14:10 UTC50m
2026-07-25 SKW3133 LAX → SEA Jul 25, 02:40 UTCJul 25, 03:25 UTC45m
2026-07-24 SKW3221 EUG → LAX Jul 24, 23:10 UTCJul 25, 00:20 UTC1h 10m
2026-07-24 SKW3346 LAX → SFO Jul 24, 20:15 UTCJul 24, 21:05 UTC50m
2026-07-24 SKW3499 LAX → SFO Jul 24, 16:55 UTCJul 24, 18:05 UTC1h 10m
2026-07-24 SKW3131 BOI → SJC Jul 24, 13:40 UTCJul 24, 15:20 UTC1h 40m
2026-07-24 SKW3215 SJD → LAS Jul 24, 02:30 UTCJul 24, 03:20 UTC50m
2026-07-24 SKW3052 SFO → LAX Jul 24, 01:00 UTCJul 24, 01:45 UTC45m
2026-07-23 SKW3490 STS → SNA Jul 23, 20:10 UTCJul 24, 00:00 UTC3h 50m
2026-07-23 SKW3100 SBA → PHX Jul 23, 17:45 UTCJul 23, 18:45 UTC1h 0m
2026-07-23 SKW3101 FWA → DFW Jul 23, 15:30 UTCJul 23, 16:20 UTC50m
2026-07-23 SKW3044 PDX → SMF Jul 23, 03:55 UTCJul 23, 05:25 UTC1h 30m
2026-07-23 SKW3086 GRK → DFW Jul 23, 01:45 UTCJul 23, 02:50 UTC1h 5m
2026-07-22 SKW3086 GRK → DFW Jul 22, 23:45 UTCJul 23, 00:50 UTC1h 5m
2026-07-22 SKW3076 HOU → DFW Jul 22, 21:25 UTCJul 22, 22:35 UTC1h 10m
2026-07-22 SKW3049 - Jul 22, 18:50 UTCJul 22, 20:00 UTC1h 10m
2026-07-22 SKW3114 - Jul 22, 16:20 UTCJul 22, 17:35 UTC1h 15m
2026-07-22 SKW3322 MFR → LAX Jul 22, 13:15 UTCJul 22, 15:00 UTC1h 45m
2026-07-22 SKW3206 SAN → PDX Jul 22, 03:15 UTCJul 22, 05:10 UTC1h 55m
2026-07-22 SKW3036 LAX → SFO Jul 22, 01:10 UTCJul 22, 02:25 UTC1h 15m
2026-07-21 SKW3035 GEG → SEA Jul 21, 22:38 UTCJul 21, 23:44 UTC1h 6m
2026-07-21 SKW3035 GEG → SEA Jul 21, 22:35 UTCJul 21, 23:50 UTC1h 15m
2026-07-21 SKW3028 SAN → LAS Jul 21, 20:40 UTCJul 21, 21:30 UTC50m
2026-07-21 SKW3023 SFO → SEA Jul 21, 18:50 UTCJul 21, 19:45 UTC55m
2026-07-21 SKW3409 SAN → STS Jul 21, 16:50 UTCJul 21, 17:40 UTC50m
2026-07-21 SKW3409 SAN → STS Jul 21, 16:04 UTCJul 21, 17:36 UTC1h 32m
2026-07-21 SKW847E SAN → FAT Jul 21, 05:25 UTCJul 21, 06:02 UTC37m
2026-07-21 SKW847E - Jul 21, 05:15 UTCJul 21, 06:00 UTC45m
2026-07-21 SKW3211 LEX → ORD Jul 21, 00:15 UTCJul 21, 01:30 UTC1h 15m
2026-07-21 SKW3211 LEX → ORD Jul 21, 00:22 UTCJul 21, 01:24 UTC1h 2m
2026-07-20 SKW3210 ORD → LEX Jul 20, 21:45 UTCJul 20, 23:25 UTC1h 40m
2026-07-20 SKW3117 - Jul 20, 18:55 UTCJul 20, 20:25 UTC1h 30m
2026-07-20 SKW3122 PHX → STS Jul 20, 16:10 UTCJul 20, 17:45 UTC1h 35m
2026-07-20 SKW3020 SNA → SFO Jul 20, 02:30 UTCJul 20, 04:30 UTC2h 0m
2026-07-19 SKW3012 - Jul 19, 23:00 UTCJul 20, 01:05 UTC2h 5m
2026-07-19 SKW3482 - Jul 19, 20:40 UTCJul 19, 22:00 UTC1h 20m
2026-07-19 SKW3486 BOI → SFO Jul 19, 18:25 UTCJul 19, 19:25 UTC1h 0m
2026-07-19 SKW3287 - Jul 19, 15:45 UTCJul 19, 17:00 UTC1h 15m
2026-07-18 SKW3228 - Jul 18, 23:55 UTCJul 19, 01:10 UTC1h 15m
2026-07-18 SKW3484 SJC → PDX Jul 18, 18:15 UTCJul 18, 22:55 UTC4h 40m
2026-07-18 SKW3132 SEA → PDX Jul 18, 16:20 UTCJul 18, 16:50 UTC30m
2026-07-18 SKW3408 PDX → FAT Jul 18, 00:19 UTCJul 18, 00:50 UTC30m
2026-07-17 SKW3300 MFR → PDX Jul 17, 22:40 UTCJul 17, 23:20 UTC40m

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 N402SY page for operator, model, and routing details .

Mode-S A4B5B6 frequently asked

What is Mode-S code A4B5B6?
A4B5B6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N402SY.
Where is Mode-S A4B5B6 registered?
Mode-S code A4B5B6 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 A4B5B6 broadcasting right now?
Yes. Mode-S A4B5B6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B5B6, octal 51132666, decimal 10,794,422.
What flights does A4B5B6 operate?
Mode-S A4B5B6 has broadcast 20 distinct callsigns, including SKW3404, SKW3398, SKW3450, SKW3360, SKW3328.