Apparatus

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sensors Mode-S transponder

A2ABDA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N271SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2ABDA
Octal
50525732
Decimal
10,660,826
Country
US
Tail
N271SY
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
649
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A2ABDA.

Country allocation

The ICAO 24-bit address A2ABDA 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
SKW3805 - 18 2026-07-05
SKW3718 - 18 2026-07-07
SKW4454 SkyWest Airlines 16 2026-06-01
SKW4457 SkyWest Airlines 15 2026-05-06
SKW4082 SkyWest Airlines 15 2026-07-21
SKW3717 - 15 2026-07-07
SKW4442 SkyWest Airlines 14 2026-07-22
SKW4102 SkyWest Airlines 12 2026-06-05
SKW3851 SkyWest Airlines 12 2026-06-04
SKW3776 SkyWest Airlines 12 2026-07-26
SKW3507 SkyWest Airlines 12 2026-07-23
SKW4144 SkyWest Airlines 11 2026-06-05
SKW4133 SkyWest Airlines 11 2026-07-24
SKW4038 SkyWest Airlines 11 2026-05-04
SKW3579 - 10 2026-07-20
SKW4011 SkyWest Airlines 9 2026-07-24
SKW3778 - 9 2026-07-07
SKW3704 - 9 2026-07-03
SKW4037 - 8 2026-07-01
SKW3985 - 8 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3776 SJC → SEA Jul 26, 21:15 UTCJul 26, 22:30 UTC1h 15m
2026-07-26 SKW4099 SJC → LAX Jul 26, 17:45 UTCJul 26, 18:50 UTC1h 5m
2026-07-26 SKW4099 SJC → LAX Jul 26, 15:30 UTCJul 26, 16:20 UTC50m
2026-07-26 SKW3743 SEA → SFO Jul 26, 13:35 UTCJul 26, 14:00 UTC25m
2026-07-26 SKW3746 LAX → SAN Jul 26, 06:00 UTCJul 26, 06:30 UTC30m
2026-07-26 SKW3746 LAX → SAN Jul 26, 06:05 UTCJul 26, 06:25 UTC20m
2026-07-26 SKW3883 MSP → MDW Jul 26, 04:10 UTCJul 26, 05:10 UTC1h 0m
2026-07-26 SKW3883 MSP → MDW Jul 26, 03:38 UTCJul 26, 05:05 UTC1h 27m
2026-07-26 SKW3883 MSP → MDW Jul 26, 02:05 UTCJul 26, 02:50 UTC45m
2026-07-25 SKW3842 MSP → RAP Jul 25, 22:10 UTCJul 25, 23:05 UTC55m
2026-07-25 SKW3842 MSP → RAP Jul 25, 20:00 UTCJul 25, 20:45 UTC45m
2026-07-25 SKW4119 LAX → PHX Jul 25, 17:50 UTCJul 25, 18:50 UTC1h 0m
2026-07-25 SKW4119 LAX → PHX Jul 25, 14:35 UTCJul 25, 15:40 UTC1h 5m
2026-07-25 SKW3759 JFK → BNA Jul 25, 03:55 UTCJul 25, 05:05 UTC1h 10m
2026-07-25 SKW3759 JFK → BNA Jul 25, 02:00 UTCJul 25, 03:00 UTC1h 0m
2026-07-25 SKW3822 MSP → GRB Jul 25, 00:05 UTCJul 25, 01:00 UTC55m
2026-07-24 SKW3822 MSP → GRB Jul 24, 21:55 UTCJul 24, 22:45 UTC50m
2026-07-24 SKW4133 SJC → SEA Jul 24, 18:45 UTCJul 24, 20:15 UTC1h 30m
2026-07-24 SKW4011 MSP → MOT Jul 24, 14:15 UTCJul 24, 17:00 UTC2h 45m
2026-07-24 SKW3758 ATL → CRW Jul 24, 10:25 UTCJul 24, 11:20 UTC55m
2026-07-24 SKW3939 ABY → ATL Jul 24, 01:15 UTCJul 24, 02:15 UTC1h 0m
2026-07-23 SKW4448 SLC → SJC Jul 23, 22:55 UTCJul 23, 23:50 UTC55m
2026-07-23 SKW4448 SLC → SJC Jul 23, 21:05 UTCJul 23, 22:00 UTC55m
2026-07-23 SKW3507 BOS → MKE Jul 23, 18:25 UTCJul 23, 19:45 UTC1h 20m
2026-07-23 SKW3507 BOS → MKE Jul 23, 18:26 UTCJul 23, 19:44 UTC1h 18m
2026-07-23 SKW3507 BOS → MKE Jul 23, 15:40 UTCJul 23, 17:00 UTC1h 20m
2026-07-23 SKW3946 ORD → JFK Jul 23, 11:20 UTCJul 23, 13:40 UTC2h 20m
2026-07-23 SKW4118 OKC → LGA Jul 23, 00:20 UTCJul 23, 03:10 UTC2h 50m
2026-07-22 SKW4442 BOS → JFK Jul 22, 21:00 UTCJul 22, 22:30 UTC1h 30m
2026-07-22 SKW4442 BOS → JFK Jul 22, 18:25 UTCJul 22, 19:55 UTC1h 30m
2026-07-22 SKW4097 CMH → MSP Jul 22, 15:55 UTCJul 22, 17:20 UTC1h 25m
2026-07-22 SKW4097 CMH → MSP Jul 22, 13:20 UTCJul 22, 14:40 UTC1h 20m
2026-07-22 SKW3758 - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-22 SKW3939 ABY → ATL Jul 22, 01:10 UTCJul 22, 02:10 UTC1h 0m
2026-07-21 SKW4111 FWA → ATL Jul 21, 22:25 UTCJul 21, 23:50 UTC1h 25m
2026-07-21 SKW4111 FWA → ATL Jul 21, 19:50 UTCJul 21, 21:05 UTC1h 15m
2026-07-21 SKW4082 SEA → SFO Jul 21, 17:20 UTCJul 21, 18:30 UTC1h 10m
2026-07-21 SKW4082 SEA → SFO Jul 21, 17:16 UTCJul 21, 18:38 UTC1h 22m
2026-07-21 SKW4082 SEA → SFO Jul 21, 14:40 UTCJul 21, 16:05 UTC1h 25m
2026-07-21 SKW3905 - Jul 21, 11:10 UTCJul 21, 12:30 UTC1h 20m
2026-07-21 SKW3905 XNA → ATL Jul 21, 11:10 UTCJul 21, 12:29 UTC1h 19m
2026-07-21 SKW4441 ATL → XNA Jul 21, 03:10 UTCJul 21, 04:40 UTC1h 30m
2026-07-20 SKW4111 FWA → ATL Jul 20, 22:30 UTCJul 20, 23:55 UTC1h 25m
2026-07-20 SKW4111 FWA → ATL Jul 20, 20:10 UTCJul 20, 21:25 UTC1h 15m
2026-07-20 SKW4082 SEA → SFO Jul 20, 17:30 UTCJul 20, 19:00 UTC1h 30m
2026-07-20 SKW4082 SEA → SFO Jul 20, 14:35 UTCJul 20, 16:00 UTC1h 25m
2026-07-20 SKW3905 XNA → ATL Jul 20, 11:15 UTCJul 20, 12:45 UTC1h 30m
2026-07-20 SKW3905 XNA → ATL Jul 20, 11:13 UTCJul 20, 12:38 UTC1h 25m
2026-07-20 SKW4441 ATL → XNA Jul 20, 05:00 UTCJul 20, 06:15 UTC1h 15m
2026-07-20 SKW4441 ATL → XNA Jul 20, 04:58 UTCJul 20, 06:15 UTC1h 17m

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 N271SY page for operator, model, and routing details .

Mode-S A2ABDA frequently asked

What is Mode-S code A2ABDA?
A2ABDA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N271SY.
Where is Mode-S A2ABDA registered?
Mode-S code A2ABDA 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 A2ABDA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2ABDA, octal 50525732, decimal 10,660,826.
What flights does A2ABDA operate?
Mode-S A2ABDA has broadcast 20 distinct callsigns, including SKW3805, SKW3718, SKW4454, SKW4457, SKW4082.