Apparatus

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sensors Mode-S transponder

AB3D9A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N823SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB3D9A
Octal
52636632
Decimal
11,222,426
Country
US
Tail
N823SK
Type
CRJ9
No current signal · last broadcast 2d ago
Flights observed
602
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S AB3D9A.

Country allocation

The ICAO 24-bit address AB3D9A 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
SKW3971 SkyWest Airlines 18 2026-06-15
SKW3861 - 16 2026-07-03
SKW3990 - 13 2026-07-11
SKW3843 SkyWest Airlines 13 2026-06-07
SKW3921 SkyWest Airlines 12 2026-06-03
SKW4136 SkyWest Airlines 11 2026-07-01
SKW3922 SkyWest Airlines 10 2026-06-15
SKW3534 - 10 2026-07-08
SKW4140 - 9 2026-07-07
SKW4103 SkyWest Airlines 9 2026-07-08
SKW3870 SkyWest Airlines 9 2026-06-05
SKW3709 - 9 2026-07-03
SKW3595 SkyWest Airlines 9 2026-06-27
SKW4144 - 8 2026-07-10
SKW4024 - 8 2026-07-09
SKW4003 - 8 2026-07-07
SKW3864 - 8 2026-07-03
SKW3847 SkyWest Airlines 8 2026-05-06
SKW4007 SkyWest Airlines 7 2026-06-02
SKW3975 SkyWest Airlines 7 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 SKW4464 - Jul 11, 23:35 UTCJul 12, 00:20 UTC45m
2026-07-11 SKW3865 - Jul 11, 20:25 UTCJul 11, 21:40 UTC1h 15m
2026-07-11 SKW3865 MSP → GRR Jul 11, 18:15 UTCJul 11, 19:20 UTC1h 5m
2026-07-11 SKW3990 - Jul 11, 15:45 UTCJul 11, 16:45 UTC1h 0m
2026-07-11 SKW3990 GRR → MSP Jul 11, 15:52 UTCJul 11, 16:45 UTC53m
2026-07-11 SKW3990 MSP → GRR Jul 11, 13:45 UTCJul 11, 14:45 UTC1h 0m
2026-07-11 SKW3840 FSD → MSP Jul 11, 11:30 UTCJul 11, 12:00 UTC30m
2026-07-10 SKW3578 MSP → FSD Jul 10, 23:50 UTCJul 11, 00:25 UTC35m
2026-07-10 SKW3578 MSP → FSD Jul 10, 23:56 UTCJul 11, 00:20 UTC24m
2026-07-10 SKW3538 FSD → MSP Jul 10, 21:40 UTCJul 10, 22:15 UTC35m
2026-07-10 SKW3538 MSP → FSD Jul 10, 20:05 UTCJul 10, 20:35 UTC30m
2026-07-10 SKW4144 - Jul 10, 17:55 UTCJul 10, 18:50 UTC55m
2026-07-10 SKW4144 - Jul 10, 15:25 UTCJul 10, 16:25 UTC1h 0m
2026-07-10 SKW3512 - Jul 10, 13:20 UTCJul 10, 14:05 UTC45m
2026-07-10 SKW3512 OMA → MSP Jul 10, 13:18 UTCJul 10, 13:57 UTC39m
2026-07-09 SKW4024 MSP → OMA Jul 9, 23:50 UTCJul 10, 00:45 UTC55m
2026-07-09 SKW4167 STL → MSP Jul 9, 21:15 UTCJul 9, 22:20 UTC1h 5m
2026-07-09 SKW4167 MSP → STL Jul 9, 19:05 UTCJul 9, 20:10 UTC1h 5m
2026-07-09 SKW3666 - Jul 9, 17:05 UTCJul 9, 17:40 UTC35m
2026-07-09 SKW3666 - Jul 9, 15:15 UTCJul 9, 15:35 UTC20m
2026-07-09 SKW3542 - Jul 9, 12:35 UTCJul 9, 13:55 UTC1h 20m
2026-07-09 SKW3541 MSP → ICT Jul 9, 01:25 UTCJul 9, 03:00 UTC1h 35m
2026-07-08 SKW3948 HPN → ATL Jul 8, 22:55 UTCJul 8, 23:55 UTC1h 0m
2026-07-08 SKW188F - Jul 8, 21:00 UTCJul 8, 21:45 UTC45m
2026-07-08 SKW3534 FSD → MSP Jul 8, 18:40 UTCJul 8, 19:15 UTC35m
2026-07-08 SKW3534 FSD → MSP Jul 8, 18:41 UTCJul 8, 19:05 UTC24m
2026-07-08 SKW3534 MSP → FSD Jul 8, 17:00 UTCJul 8, 17:35 UTC35m
2026-07-08 SKW4103 OAK → SLC Jul 8, 14:00 UTCJul 8, 14:45 UTC45m
2026-07-08 SKW4103 OAK → SLC Jul 8, 12:20 UTCJul 8, 13:00 UTC40m
2026-07-08 SKW3840 FSD → MSP Jul 8, 10:15 UTCJul 8, 11:00 UTC45m
2026-07-08 SKW3578 LWS → SLC Jul 8, 01:30 UTCJul 8, 02:00 UTC30m
2026-07-07 SKW4167 STL → MSP Jul 7, 23:15 UTCJul 8, 00:20 UTC1h 5m
2026-07-07 SKW4167 MSP → STL Jul 7, 21:15 UTCJul 7, 22:20 UTC1h 5m
2026-07-07 SKW4066 - Jul 7, 16:45 UTCJul 7, 17:30 UTC45m
2026-07-07 SKW4066 - Jul 7, 14:25 UTCJul 7, 15:15 UTC50m
2026-07-07 SKW4140 GRB → MSP Jul 7, 12:30 UTCJul 7, 13:10 UTC40m
2026-07-07 SKW4003 MSP → GRB Jul 7, 01:50 UTCJul 7, 02:30 UTC40m
2026-07-06 SKW3534 ORD → BOS Jul 6, 19:20 UTCJul 6, 19:55 UTC35m
2026-07-06 SKW3534 ORD → BOS Jul 6, 17:55 UTCJul 6, 18:25 UTC30m
2026-07-06 SKW3990 - Jul 6, 15:40 UTCJul 6, 16:45 UTC1h 5m
2026-07-06 SKW3990 - Jul 6, 13:40 UTCJul 6, 14:35 UTC55m
2026-07-06 SKW4140 GRB → MSP Jul 6, 11:25 UTCJul 6, 12:05 UTC40m
2026-07-06 SKW4140 GRB → MSP Jul 6, 11:29 UTCJul 6, 12:05 UTC36m
2026-07-06 SKW4003 MSP → GRB Jul 6, 01:50 UTCJul 6, 02:30 UTC40m
2026-07-05 SKW3666 DTW → MDW Jul 5, 17:20 UTCJul 5, 17:45 UTC25m
2026-07-05 SKW3666 DTW → MDW Jul 5, 15:45 UTCJul 5, 16:05 UTC20m
2026-07-05 SKW3512 BOS → MKE Jul 5, 13:25 UTCJul 5, 14:25 UTC1h 0m
2026-07-04 SKW3838 MSP → OMA Jul 4, 19:15 UTCJul 4, 20:30 UTC1h 15m
2026-07-04 SKW3542 SEA → SFO Jul 4, 12:35 UTCJul 4, 13:55 UTC1h 20m
2026-07-04 SKW3541 BNA → JFK Jul 4, 02:00 UTCJul 4, 03:25 UTC1h 25m

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 N823SK page for operator, model, and routing details .

Mode-S AB3D9A frequently asked

What is Mode-S code AB3D9A?
AB3D9A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N823SK.
Where is Mode-S AB3D9A registered?
Mode-S code AB3D9A 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 AB3D9A broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3D9A, octal 52636632, decimal 11,222,426.
What flights does AB3D9A operate?
Mode-S AB3D9A has broadcast 20 distinct callsigns, including SKW3971, SKW3861, SKW3990, SKW3843, SKW3921.