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 Jul 26, 22:10 UTC
Flights observed
681
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:10 UTC

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
SKW3843 SkyWest Airlines 15 2026-07-26
SKW3990 - 13 2026-07-11
SKW3921 SkyWest Airlines 12 2026-06-03
SKW4136 SkyWest Airlines 11 2026-07-01
SKW4140 SkyWest Airlines 10 2026-07-26
SKW3922 SkyWest Airlines 10 2026-06-15
SKW3534 - 10 2026-07-08
SKW4103 SkyWest Airlines 9 2026-07-08
SKW3870 SkyWest Airlines 9 2026-06-05
SKW3709 - 9 2026-07-03
SKW3636 - 9 2026-07-18
SKW3595 SkyWest Airlines 9 2026-06-27
SKW4144 - 8 2026-07-10
SKW4065 SkyWest Airlines 8 2026-07-24
SKW4024 - 8 2026-07-09
SKW4003 - 8 2026-07-07
SKW3864 - 8 2026-07-03
SKW3847 SkyWest Airlines 8 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3843 HPN → DTW Jul 26, 21:15 UTCJul 26, 22:05 UTC50m
2026-07-26 SKW3843 HPN → DTW Jul 26, 19:40 UTCJul 26, 20:20 UTC40m
2026-07-26 SKW149R YYZ → MSP Jul 26, 16:50 UTCJul 26, 18:30 UTC1h 40m
2026-07-26 SKW139W ORD → BOS Jul 26, 13:45 UTCJul 26, 15:20 UTC1h 35m
2026-07-26 SKW4140 DTW → YYZ Jul 26, 11:15 UTCJul 26, 12:05 UTC50m
2026-07-26 SKW3850 BOI → SLC Jul 26, 01:15 UTCJul 26, 02:05 UTC50m
2026-07-25 SKW3581 DTW → CLE Jul 25, 23:05 UTCJul 25, 23:30 UTC25m
2026-07-25 SKW3581 DTW → CLE Jul 25, 21:45 UTCJul 25, 22:05 UTC20m
2026-07-25 SKW3533 SLC → SJC Jul 25, 19:25 UTCJul 25, 20:20 UTC55m
2026-07-25 SKW3533 SLC → SJC Jul 25, 15:10 UTCJul 25, 15:55 UTC45m
2026-07-25 SKW3984 JFK → CMH Jul 25, 12:00 UTCJul 25, 12:45 UTC45m
2026-07-25 SKW3850 BOI → SLC Jul 25, 00:25 UTCJul 25, 01:15 UTC50m
2026-07-25 SKW3850 BOI → SLC Jul 25, 00:25 UTCJul 25, 01:08 UTC43m
2026-07-24 SKW3860 ATL → SBN Jul 24, 22:15 UTCJul 24, 23:05 UTC50m
2026-07-24 SKW3860 ATL → SBN Jul 24, 20:30 UTCJul 24, 21:15 UTC45m
2026-07-24 SKW4065 SEA → PDX Jul 24, 18:10 UTCJul 24, 19:10 UTC1h 0m
2026-07-24 SKW4065 SEA → PDX Jul 24, 16:20 UTCJul 24, 17:15 UTC55m
2026-07-24 SKW4456 SLC → SJC Jul 24, 14:30 UTCJul 24, 15:15 UTC45m
2026-07-24 SKW4456 SLC → SJC Jul 24, 11:50 UTCJul 24, 12:35 UTC45m
2026-07-24 SKW4166 ATW → DTW Jul 24, 00:10 UTCJul 24, 00:55 UTC45m
2026-07-23 SKW4166 ATW → DTW Jul 23, 21:40 UTCJul 23, 22:30 UTC50m
2026-07-23 SKW3941 SMF → LAS Jul 23, 19:55 UTCJul 23, 20:20 UTC25m
2026-07-23 SKW3941 SMF → LAS Jul 23, 18:20 UTCJul 23, 18:40 UTC20m
2026-07-23 SKW3685 LAX → PHX Jul 23, 15:40 UTCJul 23, 17:10 UTC1h 30m
2026-07-23 SKW3685 LAX → PHX Jul 23, 13:10 UTCJul 23, 14:35 UTC1h 25m
2026-07-23 SKW4173 MSN → MSP Jul 23, 11:00 UTCJul 23, 11:30 UTC30m
2026-07-23 SKW4173 MSN → MSP Jul 23, 01:45 UTCJul 23, 02:05 UTC20m
2026-07-22 SKW3598 LAX → SJC Jul 22, 23:50 UTCJul 23, 00:30 UTC40m
2026-07-22 SKW3598 LAX → SJC Jul 22, 22:00 UTCJul 22, 22:40 UTC40m
2026-07-22 SKW3762 - Jul 22, 19:20 UTCJul 22, 20:50 UTC1h 30m
2026-07-22 SKW3762 OMA → DTW Jul 22, 19:19 UTCJul 22, 20:45 UTC1h 26m
2026-07-22 SKW3762 - Jul 22, 16:50 UTCJul 22, 18:25 UTC1h 35m
2026-07-22 SKW3697 AZO → DTW Jul 22, 14:05 UTCJul 22, 15:25 UTC1h 20m
2026-07-22 SKW3697 AZO → DTW Jul 22, 11:30 UTCJul 22, 12:30 UTC1h 0m
2026-07-22 SKW3909 - Jul 22, 04:05 UTCJul 22, 04:30 UTC25m
2026-07-22 SKW3637 LAX → SMF Jul 22, 01:40 UTCJul 22, 02:30 UTC50m
2026-07-22 SKW3637 LAX → SMF Jul 22, 00:05 UTCJul 22, 00:45 UTC40m
2026-07-21 SKW3565 - Jul 21, 21:35 UTCJul 21, 22:40 UTC1h 5m
2026-07-21 SKW3565 - Jul 21, 19:35 UTCJul 21, 20:25 UTC50m
2026-07-21 SKW4065 - Jul 21, 17:20 UTCJul 21, 18:25 UTC1h 5m
2026-07-21 SKW4065 - Jul 21, 15:20 UTCJul 21, 16:20 UTC1h 0m
2026-07-21 SKW3817 - Jul 21, 13:50 UTCJul 21, 14:15 UTC25m
2026-07-21 SKW3646 - Jul 21, 03:15 UTCJul 21, 03:35 UTC20m
2026-07-21 SKW3637 - Jul 21, 00:10 UTCJul 21, 00:50 UTC40m
2026-07-20 SKW3637 - Jul 20, 22:15 UTCJul 20, 22:55 UTC40m
2026-07-20 SKW3979 JFK → ORD Jul 20, 19:25 UTCJul 20, 19:55 UTC30m
2026-07-20 SKW3979 JFK → ORD Jul 20, 17:55 UTCJul 20, 18:25 UTC30m
2026-07-20 SKW4123 - Jul 20, 13:20 UTCJul 20, 14:15 UTC55m
2026-07-20 SKW4123 - Jul 20, 11:15 UTCJul 20, 12:10 UTC55m
2026-07-19 SKW4252 DTW → APN Jul 19, 22:05 UTCJul 19, 22:35 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 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 Jul 26, 22:10 UTC.
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, SKW3843, SKW3990, SKW3921.