Apparatus

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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
Transponder active on ground
Flights observed
619
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A27A94.

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
SKW3802 SkyWest Airlines 7 2026-07-20
SKW3745 - 7 2026-06-25
SKW4127 - 6 2026-07-17
SKW4087 - 6 2026-07-18
SKW3908 - 6 2026-07-05
SKW3824 - 6 2026-07-14
SKW3798 SkyWest Airlines 6 2026-06-01
SKW3754 - 6 2026-07-19
SKW4444 SkyWest Airlines 5 2026-07-24
SKW4134 SkyWest Airlines 5 2026-06-15
SKW4112 SkyWest Airlines 5 2026-06-25
SKW4100 - 5 2026-07-15
SKW4068 SkyWest Airlines 5 2026-05-21
SKW4054 - 5 2026-06-25
SKW4026 SkyWest Airlines 5 2026-07-22
SKW3999 SkyWest Airlines 5 2026-07-26
SKW3959 - 5 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3999 MSN → DTW Jul 26, 22:10 UTCJul 26, 23:00 UTC50m
2026-07-26 SKW183T BOI → SEA Jul 26, 19:25 UTCJul 26, 20:30 UTC1h 5m
2026-07-26 SKW3678 BOS → CLE Jul 26, 17:15 UTCJul 26, 18:20 UTC1h 5m
2026-07-26 SKW4471 PDX → SEA Jul 26, 14:15 UTCJul 26, 14:50 UTC35m
2026-07-26 SKW3923 OAK → LAX Jul 26, 02:25 UTCJul 26, 03:00 UTC35m
2026-07-25 SKW4165 MSN → MSP Jul 25, 23:45 UTCJul 26, 00:30 UTC45m
2026-07-25 SKW4145 DTW → YUL Jul 25, 22:05 UTCJul 25, 22:55 UTC50m
2026-07-25 SKW3878 CLE → LGA Jul 25, 19:30 UTCJul 25, 20:25 UTC55m
2026-07-25 SKW3878 CLE → LGA Jul 25, 19:25 UTCJul 25, 20:15 UTC50m
2026-07-25 SKW3806 LAX → OAK Jul 25, 17:05 UTCJul 25, 18:25 UTC1h 20m
2026-07-25 SKW4006 TUL → SLC Jul 25, 13:15 UTCJul 25, 15:25 UTC2h 10m
2026-07-25 SKW4006 TUL → SLC Jul 25, 13:18 UTCJul 25, 15:18 UTC2h 0m
2026-07-24 SKW3825 MSP → MOT Jul 24, 23:30 UTCJul 25, 01:30 UTC2h 0m
2026-07-24 SKW3765 LAX → SJC Jul 24, 21:55 UTCJul 24, 22:25 UTC30m
2026-07-24 SKW3765 LAX → SJC Jul 24, 19:40 UTCJul 24, 20:05 UTC25m
2026-07-24 SKW4444 SLC → GEG Jul 24, 16:55 UTCJul 24, 18:15 UTC1h 20m
2026-07-24 SKW4444 SLC → GEG Jul 24, 14:30 UTCJul 24, 15:50 UTC1h 20m
2026-07-24 SKW3839 SLC → HLN Jul 24, 03:25 UTCJul 24, 12:50 UTC9h 25m
2026-07-24 SKW3777 HPN → ATL Jul 24, 00:30 UTCJul 24, 01:40 UTC1h 10m
2026-07-23 SKW3777 HPN → ATL Jul 23, 21:55 UTCJul 23, 23:05 UTC1h 10m
2026-07-23 SKW3768 SJC → SEA Jul 23, 19:50 UTCJul 23, 21:00 UTC1h 10m
2026-07-23 SKW3768 SJC → SEA Jul 23, 17:15 UTCJul 23, 18:30 UTC1h 15m
2026-07-23 SKW4029 SJC → SLC Jul 23, 13:35 UTCJul 23, 15:45 UTC2h 10m
2026-07-23 SKW3703 BOS → EWR Jul 23, 03:10 UTCJul 23, 05:10 UTC2h 0m
2026-07-22 SKW3882 - Jul 22, 23:25 UTCJul 23, 01:35 UTC2h 10m
2026-07-22 SKW116X ATL → SBN Jul 22, 20:15 UTCJul 22, 22:30 UTC2h 15m
2026-07-22 SKW4026 MSP → ATW Jul 22, 16:50 UTCJul 22, 18:25 UTC1h 35m
2026-07-22 SKW4451 SEA → SFO Jul 22, 15:00 UTCJul 22, 15:50 UTC50m
2026-07-22 SKW4115 ABQ → LAX Jul 22, 12:10 UTCJul 22, 13:45 UTC1h 35m
2026-07-22 SKW4098 MDW → MSP Jul 22, 03:50 UTCJul 22, 05:25 UTC1h 35m
2026-07-22 SKW4098 MDW → MSP Jul 22, 03:50 UTCJul 22, 05:19 UTC1h 29m
2026-07-22 SKW4091 ABQ → LAX Jul 22, 01:00 UTCJul 22, 02:45 UTC1h 45m
2026-07-21 SKW4091 ABQ → LAX Jul 21, 22:10 UTCJul 21, 23:55 UTC1h 45m
2026-07-21 SKW3744 LAX → OAK Jul 21, 19:45 UTCJul 21, 20:55 UTC1h 10m
2026-07-21 SKW3680 IAD → MSP Jul 21, 15:55 UTCJul 21, 18:40 UTC2h 45m
2026-07-21 SKW4036 HPN → ATL Jul 21, 13:25 UTCJul 21, 14:05 UTC40m
2026-07-21 SKW4047 HPN → DTW Jul 21, 04:55 UTCJul 21, 05:35 UTC40m
2026-07-21 SKW4031 - Jul 21, 01:15 UTCJul 21, 03:20 UTC2h 5m
2026-07-20 SKW4031 SEA → ONT Jul 20, 22:00 UTCJul 21, 00:15 UTC2h 14m
2026-07-20 SKW3802 SJC → SEA Jul 20, 19:40 UTCJul 20, 20:05 UTC25m
2026-07-20 SKW3802 SJC → SEA Jul 20, 18:00 UTCJul 20, 18:35 UTC35m
2026-07-20 SKW4092 SEA → SEA Jul 20, 03:15 UTCJul 20, 16:10 UTC12h 55m
2026-07-20 SKW127T MFR → SEA Jul 20, 01:00 UTCJul 20, 01:55 UTC55m
2026-07-19 SKW3770 SEA → MFR Jul 19, 23:00 UTCJul 20, 00:00 UTC1h 0m
2026-07-19 SKW3754 GEG → SEA Jul 19, 20:30 UTCJul 19, 21:20 UTC50m
2026-07-19 SKW3754 GEG → SEA Jul 19, 20:37 UTCJul 19, 21:17 UTC40m
2026-07-19 SKW3754 SEA → GEG Jul 19, 18:15 UTCJul 19, 18:55 UTC40m
2026-07-19 SKW4075 LAX → OAK Jul 19, 15:06 UTCJul 19, 16:26 UTC1h 20m
2026-07-19 SKW4075 LAX → OAK Jul 19, 15:10 UTCJul 19, 16:35 UTC1h 25m
2026-07-19 SKW4131 HRL → AUS Jul 19, 04:05 UTCJul 19, 05:35 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 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?
Mode-S A27A94 is currently broadcasting from the ground.
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, SKW3802, SKW3745.