Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AB4151

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N824SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB4151
Octal
52640521
Decimal
11,223,377
Country
US
Tail
N824SK
Type
CRJ9
No current signal · last broadcast Jul 26, 15:25 UTC
Flights observed
725
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:25 UTC

Last known position

Most recent position reported by Mode-S AB4151.

Country allocation

The ICAO 24-bit address AB4151 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
SKW4130 - 19 2026-06-24
SKW4055 SkyWest Airlines 16 2026-07-20
SKW4096 SkyWest Airlines 14 2026-07-24
SKW3851 - 14 2026-06-27
SKW3831 - 13 2026-06-29
SKW4040 SkyWest Airlines 12 2026-07-20
SKW3995 - 12 2026-06-24
SKW4103 SkyWest Airlines 11 2026-06-23
SKW3971 - 11 2026-06-28
SKW4120 SkyWest Airlines 10 2026-07-24
SKW3976 SkyWest Airlines 10 2026-07-23
SKW3870 SkyWest Airlines 10 2026-05-22
SKW3843 - 10 2026-07-18
SKW3840 - 10 2026-06-23
SKW4162 SkyWest Airlines 9 2026-04-26
SKW3927 - 9 2026-06-27
SKW4456 - 8 2026-07-15
SKW3861 - 8 2026-06-20
SKW3838 - 8 2026-06-18
SKW3636 SkyWest Airlines 8 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3500 LAX → SFO Jul 26, 14:50 UTCJul 26, 15:25 UTC35m
2026-07-26 SKW3500 LAX → SFO Jul 26, 13:15 UTCJul 26, 13:45 UTC30m
2026-07-26 SKW3532 BOS → CLE Jul 26, 10:45 UTCJul 26, 11:10 UTC25m
2026-07-26 SKW4071 MSP → BIS Jul 26, 00:35 UTCJul 26, 00:55 UTC20m
2026-07-25 SKW3586 SEA → SFO Jul 25, 23:10 UTCJul 25, 23:25 UTC15m
2026-07-25 SKW3586 SEA → SFO Jul 25, 21:30 UTCJul 25, 21:45 UTC15m
2026-07-25 SKW3792 OMA → DTW Jul 25, 18:35 UTCJul 25, 19:30 UTC55m
2026-07-25 SKW3792 OMA → DTW Jul 25, 18:33 UTCJul 25, 19:29 UTC56m
2026-07-25 SKW3792 OMA → DTW Jul 25, 16:40 UTCJul 25, 17:25 UTC45m
2026-07-25 SKW3671 MDW → DTW Jul 25, 14:45 UTCJul 25, 15:30 UTC45m
2026-07-25 SKW3671 MDW → DTW Jul 25, 12:35 UTCJul 25, 13:30 UTC55m
2026-07-24 SKW4096 SMF → SEA Jul 24, 21:30 UTCJul 24, 22:15 UTC45m
2026-07-24 SKW4096 SMF → SEA Jul 24, 21:32 UTCJul 24, 22:43 UTC1h 11m
2026-07-24 SKW4096 SMF → SEA Jul 24, 18:50 UTCJul 24, 19:55 UTC1h 5m
2026-07-24 SKW4120 DTW → MEM Jul 24, 16:40 UTCJul 24, 17:25 UTC45m
2026-07-24 SKW4120 DTW → MEM Jul 24, 14:35 UTCJul 24, 15:20 UTC45m
2026-07-24 SKW3665 BOI → SLC Jul 24, 12:15 UTCJul 24, 13:00 UTC45m
2026-07-24 SKW3665 BOI → SLC Jul 24, 12:15 UTCJul 24, 12:53 UTC38m
2026-07-24 SKW3544 MSP → IAD Jul 24, 01:05 UTCJul 24, 01:55 UTC50m
2026-07-23 SKW3965 ATL → ABY Jul 23, 22:40 UTCJul 23, 23:15 UTC35m
2026-07-23 SKW3965 ATL → ABY Jul 23, 20:55 UTCJul 23, 21:30 UTC35m
2026-07-23 SKW3976 SDF → MSP Jul 23, 19:00 UTCJul 23, 19:35 UTC35m
2026-07-23 SKW3976 SDF → MSP Jul 23, 18:49 UTCJul 23, 19:27 UTC38m
2026-07-23 SKW3976 SDF → MSP Jul 23, 16:55 UTCJul 23, 17:25 UTC30m
2026-07-23 SKW3821 PHL → DTW Jul 23, 14:45 UTCJul 23, 15:35 UTC50m
2026-07-23 SKW3821 PHL → DTW Jul 23, 12:40 UTCJul 23, 13:30 UTC50m
2026-07-23 SKW3826 MSP → SDF Jul 23, 10:20 UTCJul 23, 11:25 UTC1h 5m
2026-07-23 SKW3988 DTW → AZO Jul 23, 02:05 UTCJul 23, 03:00 UTC55m
2026-07-23 SKW3988 DTW → AZO Jul 23, 02:06 UTCJul 23, 02:51 UTC45m
2026-07-22 SKW3675 SJC → LAS Jul 22, 23:55 UTCJul 23, 00:40 UTC45m
2026-07-22 SKW3675 SJC → LAS Jul 22, 21:55 UTCJul 22, 22:45 UTC50m
2026-07-22 SKW3581 DTW → CLE Jul 22, 20:05 UTCJul 22, 20:30 UTC25m
2026-07-22 SKW3581 DTW → CLE Jul 22, 18:25 UTCJul 22, 18:45 UTC20m
2026-07-22 SKW4059 DTW → HPN Jul 22, 16:15 UTCJul 22, 17:00 UTC45m
2026-07-22 SKW4059 DTW → HPN Jul 22, 14:20 UTCJul 22, 15:10 UTC50m
2026-07-22 SKW3977 DTW → MSN Jul 22, 12:00 UTCJul 22, 12:50 UTC50m
2026-07-22 SKW4013 SEA → MFR Jul 22, 01:20 UTCJul 22, 02:05 UTC45m
2026-07-22 SKW4013 SEA → MFR Jul 22, 01:21 UTCJul 22, 01:55 UTC34m
2026-07-21 SKW3860 - Jul 21, 21:50 UTCJul 21, 22:55 UTC1h 5m
2026-07-21 SKW3860 - Jul 21, 19:55 UTCJul 21, 20:40 UTC45m
2026-07-21 SKW3673 ABQ → SLC Jul 21, 17:00 UTCJul 21, 17:45 UTC45m
2026-07-21 SKW3673 ABQ → SLC Jul 21, 14:30 UTCJul 21, 15:15 UTC45m
2026-07-21 SKW3837 - Jul 21, 12:40 UTCJul 21, 13:20 UTC40m
2026-07-20 SKW3900 - Jul 20, 23:55 UTCJul 21, 00:25 UTC30m
2026-07-20 SKW4040 ATL → HPN Jul 20, 21:25 UTCJul 20, 23:00 UTC1h 35m
2026-07-20 SKW4040 ATL → HPN Jul 20, 21:15 UTCJul 20, 22:52 UTC1h 37m
2026-07-20 SKW4040 ATL → HPN Jul 20, 18:30 UTCJul 20, 19:55 UTC1h 25m
2026-07-20 SKW4055 SJC → SEA Jul 20, 15:40 UTCJul 20, 17:15 UTC1h 35m
2026-07-20 SKW4055 SJC → SEA Jul 20, 13:00 UTCJul 20, 14:30 UTC1h 30m
2026-07-20 SKW3626 - Jul 20, 10:15 UTCJul 20, 11:45 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 N824SK page for operator, model, and routing details .

Mode-S AB4151 frequently asked

What is Mode-S code AB4151?
AB4151 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N824SK.
Where is Mode-S AB4151 registered?
Mode-S code AB4151 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 AB4151 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB4151, octal 52640521, decimal 11,223,377.
What flights does AB4151 operate?
Mode-S AB4151 has broadcast 20 distinct callsigns, including SKW4130, SKW4055, SKW4096, SKW3851, SKW3831.