Apparatus

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sensors Mode-S transponder

AB04E6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N809SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB04E6
Octal
52602346
Decimal
11,207,910
Country
US
Tail
N809SK
Type
CRJ9
No current signal · last broadcast Jul 26, 14:20 UTC
Flights observed
599
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 14:20 UTC

Last known position

Most recent position reported by Mode-S AB04E6.

Country allocation

The ICAO 24-bit address AB04E6 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
SKW4120 - 20 2026-07-19
SKW4055 SkyWest Airlines 19 2026-07-22
SKW4456 SkyWest Airlines 17 2026-07-21
SKW3877 SkyWest Airlines 17 2026-06-05
SKW3850 SkyWest Airlines 17 2026-07-20
SKW3984 SkyWest Airlines 16 2026-07-20
SKW4040 SkyWest Airlines 15 2026-07-17
SKW4103 SkyWest Airlines 14 2026-06-05
SKW4440 - 12 2026-07-17
SKW3898 SkyWest Airlines 12 2026-05-20
SKW4096 SkyWest Airlines 11 2026-07-19
SKW4130 - 9 2026-06-21
SKW3919 - 8 2026-07-04
SKW3637 SkyWest Airlines 8 2026-07-03
SKW3626 - 8 2026-07-18
SKW4034 SkyWest Airlines 7 2026-07-25
SKW3785 - 7 2026-07-20
SKW3565 - 7 2026-07-16
SKW4176 SkyWest Airlines 6 2026-05-20
SKW4065 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3685 LAX → PHX Jul 26, 13:00 UTCJul 26, 14:20 UTC1h 20m
2026-07-25 SKW3668 MKE → MSP Jul 25, 23:50 UTCJul 26, 00:30 UTC40m
2026-07-25 SKW3668 MKE → MSP Jul 25, 22:15 UTCJul 25, 23:00 UTC45m
2026-07-25 SKW4034 CLE → BOS Jul 25, 19:30 UTCJul 25, 20:00 UTC30m
2026-07-25 SKW4034 CLE → BOS Jul 25, 19:31 UTCJul 25, 19:57 UTC26m
2026-07-25 SKW4034 CLE → BOS Jul 25, 17:50 UTCJul 25, 18:15 UTC25m
2026-07-25 SKW4013 SEA → MFR Jul 25, 00:10 UTCJul 25, 00:40 UTC30m
2026-07-24 SKW3586 SEA → SFO Jul 24, 22:45 UTCJul 24, 23:05 UTC20m
2026-07-24 SKW3586 SEA → SFO Jul 24, 21:30 UTCJul 24, 21:45 UTC15m
2026-07-24 SKW3586 SEA → SFO Jul 24, 21:22 UTCJul 24, 21:44 UTC22m
2026-07-24 SKW3979 JFK → ORD Jul 24, 19:40 UTCJul 24, 20:05 UTC25m
2026-07-24 SKW3979 JFK → ORD Jul 24, 18:25 UTCJul 24, 18:50 UTC25m
2026-07-24 SKW3685 LAX → PHX Jul 24, 15:45 UTCJul 24, 17:15 UTC1h 30m
2026-07-24 SKW3685 LAX → PHX Jul 24, 12:50 UTCJul 24, 14:15 UTC1h 25m
2026-07-24 SKW3858 DTW → OMA Jul 24, 10:15 UTCJul 24, 11:05 UTC50m
2026-07-24 SKW3949 LGA → BNA Jul 24, 02:30 UTCJul 24, 03:10 UTC40m
2026-07-24 SKW3782 SMF → LAX Jul 24, 00:05 UTCJul 24, 00:40 UTC35m
2026-07-23 SKW3782 SMF → LAX Jul 23, 22:10 UTCJul 23, 22:40 UTC30m
2026-07-23 SKW3559 PIT → MSP Jul 23, 20:25 UTCJul 23, 20:50 UTC25m
2026-07-23 SKW3559 PIT → MSP Jul 23, 20:19 UTCJul 23, 20:49 UTC30m
2026-07-23 SKW3559 PIT → MSP Jul 23, 18:55 UTCJul 23, 19:20 UTC25m
2026-07-22 SKW4055 SJC → SEA Jul 22, 15:45 UTCJul 22, 17:10 UTC1h 25m
2026-07-22 SKW4055 SJC → SEA Jul 22, 13:10 UTCJul 22, 14:45 UTC1h 35m
2026-07-21 SKW4456 SLC → SJC Jul 21, 15:53 UTCJul 21, 16:12 UTC19m
2026-07-21 SKW4456 SLC → SJC Jul 21, 15:30 UTCJul 21, 16:15 UTC45m
2026-07-21 SKW4456 SLC → SJC Jul 21, 13:15 UTCJul 21, 14:00 UTC45m
2026-07-20 SKW3785 - Jul 20, 21:25 UTCJul 20, 22:40 UTC1h 15m
2026-07-20 SKW3785 ALB → DTW Jul 20, 21:22 UTCJul 20, 22:29 UTC1h 7m
2026-07-20 SKW3785 - Jul 20, 19:00 UTCJul 20, 20:05 UTC1h 5m
2026-07-20 SKW3673 ABQ → SLC Jul 20, 16:45 UTCJul 20, 17:30 UTC45m
2026-07-20 SKW3673 ABQ → SLC Jul 20, 14:25 UTCJul 20, 15:15 UTC50m
2026-07-20 SKW3984 JFK → CMH Jul 20, 12:01 UTCJul 20, 12:34 UTC33m
2026-07-20 SKW3984 JFK → CMH Jul 20, 12:00 UTCJul 20, 12:40 UTC40m
2026-07-20 SKW3850 BOI → SLC Jul 20, 02:45 UTCJul 20, 03:30 UTC45m
2026-07-20 SKW3964 DTW → MSN Jul 20, 01:10 UTCJul 20, 01:30 UTC20m
2026-07-20 SKW3964 DTW → MSN Jul 20, 01:11 UTCJul 20, 01:26 UTC15m
2026-07-19 SKW3964 DTW → MSN Jul 19, 23:55 UTCJul 20, 00:20 UTC25m
2026-07-19 SKW4096 SMF → SEA Jul 19, 21:30 UTCJul 19, 22:55 UTC1h 25m
2026-07-19 SKW4096 SMF → SEA Jul 19, 18:55 UTCJul 19, 20:05 UTC1h 10m
2026-07-19 SKW4120 ROC → DTW Jul 19, 16:35 UTCJul 19, 17:30 UTC55m
2026-07-19 SKW4120 - Jul 19, 14:40 UTCJul 19, 15:25 UTC45m
2026-07-19 SKW3665 BOI → SLC Jul 19, 12:10 UTCJul 19, 13:05 UTC55m
2026-07-19 SKW3665 BOI → SLC Jul 19, 12:12 UTCJul 19, 13:00 UTC48m
2026-07-19 SKW3544 - Jul 19, 01:25 UTCJul 19, 02:20 UTC55m
2026-07-18 SKW3860 - Jul 18, 23:25 UTCJul 19, 00:25 UTC1h 0m
2026-07-18 SKW3860 ELM → DTW Jul 18, 23:28 UTCJul 19, 00:21 UTC53m
2026-07-18 SKW3860 - Jul 18, 21:15 UTCJul 18, 22:35 UTC1h 20m
2026-07-18 SKW4055 SJC → SEA Jul 18, 15:35 UTCJul 18, 17:00 UTC1h 25m
2026-07-18 SKW4055 SJC → SEA Jul 18, 13:00 UTCJul 18, 14:30 UTC1h 30m
2026-07-18 SKW3626 - Jul 18, 10:15 UTCJul 18, 11:55 UTC1h 40m

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 N809SK page for operator, model, and routing details .

Mode-S AB04E6 frequently asked

What is Mode-S code AB04E6?
AB04E6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N809SK.
Where is Mode-S AB04E6 registered?
Mode-S code AB04E6 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 AB04E6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB04E6, octal 52602346, decimal 11,207,910.
What flights does AB04E6 operate?
Mode-S AB04E6 has broadcast 20 distinct callsigns, including SKW4120, SKW4055, SKW4456, SKW3877, SKW3850.