Apparatus

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sensors Mode-S transponder

A2C5DB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N278SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2C5DB
Octal
50542733
Decimal
10,667,483
Country
US
Tail
N278SY
Type
E75L
No current signal · last broadcast 16d ago
Flights observed
508
Distinct callsigns
20
Country
US
Last broadcast
16d ago

Last known position

Most recent position reported by Mode-S A2C5DB.

Country allocation

The ICAO 24-bit address A2C5DB 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
SKW3852 - 14 2026-06-20
SKW4449 - 12 2026-06-18
SKW3769 SkyWest Airlines 12 2026-06-18
SKW3718 SkyWest Airlines 11 2026-06-07
SKW3722 - 9 2026-06-18
SKW3717 SkyWest Airlines 9 2026-06-07
SKW4052 SkyWest Airlines 8 2026-06-04
SKW3857 - 8 2026-06-13
SKW3723 - 8 2026-06-25
SKW4135 SkyWest Airlines 7 2026-04-27
SKW4125 SkyWest Airlines 7 2026-05-25
SKW3992 SkyWest Airlines 7 2026-05-29
SKW3833 SkyWest Airlines 7 2026-05-22
SKW3828 SkyWest Airlines 7 2026-06-06
SKW3777 SkyWest Airlines 7 2026-06-01
SKW3768 SkyWest Airlines 7 2026-06-16
SKW3688 SkyWest Airlines 7 2026-05-30
SKW129H - 7 2026-06-18
SKW4075 - 6 2026-06-23
SKW4062 - 6 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 SKW4609 - Jun 27, 19:29 UTCJun 27, 19:59 UTC30m
2026-06-27 SKW4107 - Jun 27, 10:25 UTCJun 27, 12:09 UTC1h 45m
2026-06-26 SKW4109 - Jun 26, 23:55 UTCJun 27, 01:15 UTC1h 20m
2026-06-26 SKW3905 MSP → MEM Jun 26, 11:09 UTCJun 26, 12:34 UTC1h 25m
2026-06-26 SKW4441 DTW → MCI Jun 26, 03:10 UTCJun 26, 04:55 UTC1h 45m
2026-06-25 SKW3579 MSP → MSN Jun 25, 23:44 UTCJun 26, 00:15 UTC30m
2026-06-25 SKW3579 MSP → MSN Jun 25, 22:04 UTCJun 25, 22:34 UTC30m
2026-06-25 SKW3723 - Jun 25, 18:55 UTCJun 25, 20:25 UTC1h 30m
2026-06-25 SKW3730 MSP → MSN Jun 25, 16:05 UTCJun 25, 17:25 UTC1h 20m
2026-06-25 SKW3946 ORD → JFK Jun 25, 12:19 UTCJun 25, 14:39 UTC2h 20m
2026-06-25 SKW4118 OKC → LGA Jun 25, 00:49 UTCJun 25, 03:34 UTC2h 45m
2026-06-24 SKW4442 BOS → JFK Jun 24, 22:25 UTCJun 24, 23:50 UTC1h 25m
2026-06-24 SKW4442 BOS → JFK Jun 24, 20:05 UTCJun 24, 21:29 UTC1h 25m
2026-06-23 SKW4626 - Jun 23, 18:39 UTCJun 23, 23:00 UTC4h 20m
2026-06-23 SKW4626 SEA → ATL Jun 23, 18:25 UTCJun 23, 22:54 UTC4h 29m
2026-06-23 SKW4075 SMF → SEA Jun 23, 15:09 UTCJun 23, 16:35 UTC1h 25m
2026-06-23 SKW4075 SMF → SEA Jun 23, 15:08 UTCJun 23, 16:29 UTC1h 21m
2026-06-23 SKW4131 - Jun 23, 03:39 UTCJun 23, 05:09 UTC1h 30m
2026-06-23 SKW4153 SMF → SEA Jun 23, 00:39 UTCJun 23, 02:09 UTC1h 30m
2026-06-23 SKW4153 SMF → SEA Jun 23, 00:39 UTCJun 23, 02:03 UTC1h 24m
2026-06-22 SKW4153 - Jun 22, 22:15 UTCJun 22, 23:45 UTC1h 30m
2026-06-22 SKW4139 RAP → MSP Jun 22, 19:44 UTCJun 22, 20:34 UTC50m
2026-06-22 SKW155A SLC → EUG Jun 22, 17:10 UTCJun 22, 18:40 UTC1h 30m
2026-06-22 SKW4004 - Jun 22, 12:30 UTCJun 22, 13:39 UTC1h 10m
2026-06-22 SKW3756 SLC → RDM Jun 22, 05:20 UTCJun 22, 06:39 UTC1h 20m
2026-06-22 SKW3726 ABQ → SLC Jun 22, 02:14 UTCJun 22, 03:40 UTC1h 25m
2026-06-21 SKW3726 SLC → ABQ Jun 21, 23:34 UTCJun 22, 00:50 UTC1h 15m
2026-06-21 SKW3892 - Jun 21, 21:05 UTCJun 21, 22:20 UTC1h 15m
2026-06-21 SKW3892 - Jun 21, 18:35 UTCJun 21, 20:00 UTC1h 25m
2026-06-21 SKW3719 LEX → DTW Jun 21, 16:19 UTCJun 21, 17:20 UTC1h 0m
2026-06-21 SKW3719 LEX → DTW Jun 21, 14:15 UTCJun 21, 14:40 UTC25m
2026-06-20 SKW3933 - Jun 20, 19:44 UTCJun 20, 20:45 UTC1h 0m
2026-06-20 SKW3933 SLC → BUR Jun 20, 17:19 UTCJun 20, 18:59 UTC1h 40m
2026-06-20 SKW4030 SYR → DTW Jun 20, 13:19 UTCJun 20, 14:24 UTC1h 5m
2026-06-20 SKW120W - Jun 20, 02:54 UTCJun 20, 04:09 UTC1h 15m
2026-06-20 SKW3852 - Jun 20, 00:44 UTCJun 20, 01:50 UTC1h 5m
2026-06-19 SKW3852 - Jun 19, 21:54 UTCJun 19, 23:09 UTC1h 15m
2026-06-19 SKW3852 SLC → PSP Jun 19, 21:49 UTCJun 19, 23:14 UTC1h 25m
2026-06-19 SKW4019 - Jun 19, 19:29 UTCJun 19, 19:59 UTC30m
2026-06-19 SKW4019 SUN → SLC Jun 19, 19:23 UTCJun 19, 19:58 UTC35m
2026-06-19 SKW172E - Jun 19, 17:29 UTCJun 19, 17:55 UTC25m
2026-06-19 SKW172E SLC → SUN Jun 19, 17:25 UTCJun 19, 18:05 UTC40m
2026-06-19 SKW3691 - Jun 19, 14:19 UTCJun 19, 16:09 UTC1h 50m
2026-06-19 SKW3584 SLC → TUL Jun 19, 04:50 UTCJun 19, 06:39 UTC1h 50m
2026-06-19 SKW160Y - Jun 19, 01:59 UTCJun 19, 02:35 UTC35m
2026-06-19 SKW3895 - Jun 19, 00:10 UTCJun 19, 00:34 UTC25m
2026-06-18 SKW129H YYC → SLC Jun 18, 20:05 UTCJun 18, 21:40 UTC1h 35m
2026-06-18 SKW104T SLC → YYC Jun 18, 17:10 UTCJun 18, 19:00 UTC1h 50m
2026-06-18 SKW3769 OAK → LAX Jun 18, 12:30 UTCJun 18, 14:01 UTC1h 30m
2026-06-18 SKW3722 SLC → MFR Jun 18, 05:05 UTCJun 18, 06:35 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 N278SY page for operator, model, and routing details .

Mode-S A2C5DB frequently asked

What is Mode-S code A2C5DB?
A2C5DB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N278SY.
Where is Mode-S A2C5DB registered?
Mode-S code A2C5DB 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 A2C5DB broadcasting right now?
No active broadcast right now. Last signal was 16d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C5DB, octal 50542733, decimal 10,667,483.
What flights does A2C5DB operate?
Mode-S A2C5DB has broadcast 20 distinct callsigns, including SKW3852, SKW4449, SKW3769, SKW3718, SKW3722.