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sensors Mode-S transponder

A27A94

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N259SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A27A94
Octal
50475224
Decimal
10,648,212
Country
US
Tail
N259SY
Type
E75L
Broadcasting now · callsign SKW3824 · 12,950 ft
Flights observed
530
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A27A94 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A27A94 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
SKW3841 - 12 2026-06-27
SKW3903 - 7 2026-06-24
SKW3896 - 7 2026-06-28
SKW3745 - 7 2026-06-25
SKW3908 - 6 2026-07-05
SKW3798 SkyWest Airlines 6 2026-06-01
SKW4134 SkyWest Airlines 5 2026-06-15
SKW4112 SkyWest Airlines 5 2026-06-25
SKW4068 SkyWest Airlines 5 2026-05-21
SKW4054 - 5 2026-06-25
SKW3874 - 5 2026-06-27
SKW3832 - 5 2026-06-22
SKW3830 - 5 2026-06-21
SKW3824 - 5 2026-07-14
SKW3817 SkyWest Airlines 5 2026-05-16
SKW3802 - 5 2026-07-12
SKW3706 - 5 2026-06-27
SKW137C - 5 2026-07-06
SKW4124 - 4 2026-07-12
SKW4102 SkyWest Airlines 4 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW3824 SEA → GEG Jul 14, 17:30 UTCJul 14, 18:10 UTC40m
2026-07-14 SKW194R YVR → SEA Jul 14, 13:30 UTCJul 14, 14:05 UTC35m
2026-07-14 SKW146A SEA → YVR Jul 14, 03:55 UTCJul 14, 04:20 UTC25m
2026-07-14 SKW3918 PDX → SEA Jul 14, 01:45 UTCJul 14, 02:15 UTC30m
2026-07-13 SKW3918 SEA → PDX Jul 13, 23:05 UTCJul 13, 23:40 UTC35m
2026-07-13 SKW4125 SMF → SEA Jul 13, 20:25 UTCJul 13, 21:45 UTC1h 20m
2026-07-13 SKW4125 SEA → SMF Jul 13, 17:25 UTCJul 13, 19:10 UTC1h 45m
2026-07-13 SKW3781 - Jul 13, 13:20 UTCJul 13, 14:10 UTC50m
2026-07-13 SKW3781 MFR → SEA Jul 13, 13:33 UTCJul 13, 14:09 UTC36m
2026-07-13 SKW3954 SEA → MFR Jul 13, 05:40 UTCJul 13, 06:50 UTC1h 10m
2026-07-13 SKW3954 SEA → MFR Jul 13, 04:56 UTCJul 13, 06:43 UTC1h 47m
2026-07-13 SKW3707 SFO → SEA Jul 13, 01:05 UTCJul 13, 02:35 UTC1h 30m
2026-07-12 SKW3707 SEA → SFO Jul 12, 21:50 UTCJul 13, 00:01 UTC2h 10m
2026-07-12 SKW3802 PDX → SEA Jul 12, 19:40 UTCJul 12, 20:05 UTC25m
2026-07-12 SKW3802 PDX → SEA Jul 12, 19:30 UTCJul 12, 20:03 UTC33m
2026-07-12 SKW3802 SEA → PDX Jul 12, 17:50 UTCJul 12, 18:25 UTC35m
2026-07-12 SKW4092 SEA → SEA Jul 12, 03:10 UTCJul 12, 16:15 UTC13h 5m
2026-07-12 SKW4124 - Jul 12, 00:55 UTCJul 12, 01:40 UTC45m
2026-07-11 SKW181H SEA → EUG Jul 11, 23:25 UTCJul 12, 00:10 UTC45m
2026-07-11 SKW181H SEA → EUG Jul 11, 23:12 UTCJul 12, 00:09 UTC57m
2026-07-11 SKW3735 - Jul 11, 21:20 UTCJul 11, 22:05 UTC45m
2026-07-11 SKW3735 SEA → RDM Jul 11, 18:40 UTCJul 11, 19:20 UTC40m
2026-07-11 SKW3695 - Jul 11, 14:20 UTCJul 11, 16:35 UTC2h 15m
2026-07-11 SKW3932 BFI → SNA Jul 11, 03:01 UTCJul 11, 05:31 UTC2h 30m
2026-07-11 SKW4127 - Jul 11, 00:20 UTCJul 11, 01:25 UTC1h 5m
2026-07-10 SKW4127 - Jul 10, 22:10 UTCJul 10, 23:15 UTC1h 5m
2026-07-10 SKW3824 GEG → SEA Jul 10, 18:50 UTCJul 10, 19:30 UTC40m
2026-07-10 SKW3824 SEA → GEG Jul 10, 17:00 UTCJul 10, 17:40 UTC40m
2026-07-10 SKW3790 GEG → SEA Jul 10, 14:20 UTCJul 10, 15:05 UTC45m
2026-07-10 SKW3677 SEA → GEG Jul 10, 03:30 UTCJul 10, 04:10 UTC40m
2026-07-10 SKW4124 - Jul 10, 01:40 UTCJul 10, 02:20 UTC40m
2026-07-10 SKW4124 EUG → SEA Jul 10, 01:19 UTCJul 10, 02:17 UTC58m
2026-07-09 SKW181H SEA → EUG Jul 9, 23:45 UTCJul 10, 00:35 UTC50m
2026-07-09 SKW4609 - Jul 9, 20:20 UTCJul 9, 22:30 UTC2h 10m
2026-07-07 SKW4443 SLC → ONT Jul 7, 21:50 UTCJul 7, 23:20 UTC1h 30m
2026-07-07 SKW3880 - Jul 7, 16:55 UTCJul 7, 20:15 UTC3h 20m
2026-07-06 SKW3820 ABQ → SLC Jul 6, 22:55 UTCJul 7, 00:05 UTC1h 10m
2026-07-06 SKW3820 SLC → ABQ Jul 6, 20:25 UTCJul 6, 21:45 UTC1h 20m
2026-07-06 SKW4038 - Jul 6, 17:55 UTCJul 6, 19:00 UTC1h 5m
2026-07-06 SKW4038 BIL → SLC Jul 6, 18:02 UTCJul 6, 18:55 UTC53m
2026-07-06 SKW102P - Jul 6, 15:35 UTCJul 6, 16:35 UTC1h 0m
2026-07-06 SKW3708 EUG → SLC Jul 6, 12:40 UTCJul 6, 14:10 UTC1h 30m
2026-07-06 SKW137C SLC → EUG Jul 6, 05:07 UTCJul 6, 06:40 UTC1h 33m
2026-07-05 SKW3676 PDX → SEA Jul 5, 23:55 UTCJul 6, 02:50 UTC2h 55m
2026-07-05 SKW3908 AUS → SLC Jul 5, 20:00 UTCJul 5, 22:30 UTC2h 30m
2026-07-05 SKW4121 - Jul 5, 17:45 UTCJul 5, 18:35 UTC50m
2026-07-05 SKW4177 - Jul 5, 15:35 UTCJul 5, 16:20 UTC45m
2026-07-05 SKW3950 MSP → AUS Jul 5, 12:20 UTCJul 5, 14:35 UTC2h 15m
2026-07-05 SKW3930 - Jul 5, 10:10 UTCJul 5, 10:35 UTC25m
2026-07-05 SKW3907 - Jul 5, 03:30 UTCJul 5, 04:00 UTC30m

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 N259SY page for operator, model, and routing details .

Mode-S A27A94 frequently asked

What is Mode-S code A27A94?
A27A94 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N259SY.
Where is Mode-S A27A94 registered?
Mode-S code A27A94 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 A27A94 broadcasting right now?
Yes. Mode-S A27A94 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A27A94, octal 50475224, decimal 10,648,212.
What flights does A27A94 operate?
Mode-S A27A94 has broadcast 20 distinct callsigns, including SKW3841, SKW3903, SKW3896, SKW3745, SKW3908.