Apparatus

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sensors Mode-S transponder

AD4528

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N954SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AD4528
Octal
53242450
Decimal
11,355,432
Country
US
Tail
N954SW
Type
CRJ2
No current signal · last broadcast 1h ago
Flights observed
546
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AD4528.

Country allocation

The ICAO 24-bit address AD4528 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
SKW5271 - 18 2026-07-13
SKW5961 - 17 2026-07-11
SKW5737 - 17 2026-07-13
SKW5557 - 17 2026-07-12
SKW4779 - 17 2026-07-13
SKW5942 - 16 2026-07-13
SKW5796 - 15 2026-07-11
SKW5707 - 15 2026-07-13
SKW5738 - 12 2026-07-10
SKW5502 - 12 2026-07-12
SKW5338 - 12 2026-07-13
SKW5592 - 11 2026-07-14
SKW4729 - 11 2026-07-11
SKW410Z - 11 2026-07-12
SKW338F - 8 2026-07-12
SKW6018 - 7 2026-07-13
SKW5049 SkyWest Airlines 7 2026-05-15
SKW5139 SkyWest Airlines 6 2026-05-15
SKW5095 SkyWest Airlines 6 2026-05-12
SKW5069 SkyWest Airlines 6 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW5592 - Jul 14, 02:30 UTCJul 14, 03:10 UTC40m
2026-07-13 SKW6018 SFO → RDD Jul 13, 23:40 UTCJul 14, 00:20 UTC40m
2026-07-13 SKW4779 - Jul 13, 21:45 UTCJul 13, 22:35 UTC50m
2026-07-13 SKW5707 - Jul 13, 19:40 UTCJul 13, 20:10 UTC30m
2026-07-13 SKW5737 MAE → SFO Jul 13, 17:55 UTCJul 13, 18:25 UTC30m
2026-07-13 SKW5737 FAT → SFO Jul 13, 17:39 UTCJul 13, 18:22 UTC43m
2026-07-13 SKW5942 SFO → FAT Jul 13, 15:46 UTCJul 13, 16:01 UTC15m
2026-07-13 SKW5942 - Jul 13, 15:30 UTCJul 13, 16:00 UTC30m
2026-07-13 SKW5338 - Jul 13, 13:45 UTCJul 13, 14:15 UTC30m
2026-07-13 SKW5271 - Jul 13, 05:25 UTCJul 13, 05:55 UTC30m
2026-07-13 SKW5271 SFO → FAT Jul 13, 05:16 UTCJul 13, 05:53 UTC37m
2026-07-13 SKW5305 - Jul 13, 03:40 UTCJul 13, 04:25 UTC45m
2026-07-13 SKW5480 - Jul 13, 01:20 UTCJul 13, 01:50 UTC30m
2026-07-12 SKW5256 - Jul 12, 23:25 UTCJul 13, 00:01 UTC35m
2026-07-12 SKW5256 SBA → SFO Jul 12, 23:22 UTCJul 13, 00:09 UTC47m
2026-07-12 SKW5464 SFO → SBA Jul 12, 21:15 UTCJul 12, 22:05 UTC50m
2026-07-12 SKW5557 - Jul 12, 19:30 UTCJul 12, 19:55 UTC25m
2026-07-12 SKW5557 MRY → SFO Jul 12, 19:25 UTCJul 12, 19:48 UTC23m
2026-07-12 SKW338F - Jul 12, 17:25 UTCJul 12, 17:45 UTC20m
2026-07-12 SKW5502 MRY → SFO Jul 12, 16:01 UTCJul 12, 16:04 UTC3m
2026-07-12 SKW5502 - Jul 12, 15:45 UTCJul 12, 16:01 UTC15m
2026-07-12 SKW410Z - Jul 12, 03:55 UTCJul 12, 04:15 UTC20m
2026-07-12 SKW5592 - Jul 12, 01:30 UTCJul 12, 02:15 UTC45m
2026-07-12 SKW5592 RDD → SFO Jul 12, 01:31 UTCJul 12, 02:08 UTC37m
2026-07-11 SKW6018 SFO → RDD Jul 11, 23:35 UTCJul 12, 00:10 UTC35m
2026-07-11 SKW4779 - Jul 11, 21:30 UTCJul 11, 22:20 UTC50m
2026-07-11 SKW4779 RNO → SFO Jul 11, 21:23 UTCJul 11, 22:14 UTC51m
2026-07-11 SKW5707 - Jul 11, 19:45 UTCJul 11, 20:10 UTC25m
2026-07-11 SKW5737 - Jul 11, 18:15 UTCJul 11, 18:40 UTC25m
2026-07-11 SKW5737 FAT → SFO Jul 11, 18:18 UTCJul 11, 18:36 UTC18m
2026-07-11 SKW5942 SFO → FAT Jul 11, 16:01 UTCJul 11, 16:17 UTC16m
2026-07-11 SKW5942 - Jul 11, 15:45 UTCJul 11, 16:15 UTC30m
2026-07-11 SKW5338 - Jul 11, 13:50 UTCJul 11, 14:25 UTC35m
2026-07-11 SKW5338 FAT → SFO Jul 11, 13:48 UTCJul 11, 14:26 UTC38m
2026-07-11 SKW5271 - Jul 11, 06:25 UTCJul 11, 06:55 UTC30m
2026-07-11 SKW5271 SFO → FAT Jul 11, 06:10 UTCJul 11, 06:58 UTC48m
2026-07-11 SKW5961 SMF → SFO Jul 11, 04:30 UTCJul 11, 05:07 UTC37m
2026-07-11 SKW5961 - Jul 11, 04:40 UTCJul 11, 05:10 UTC30m
2026-07-11 SKW5796 - Jul 11, 02:15 UTCJul 11, 02:35 UTC20m
2026-07-11 SKW4729 - Jul 11, 00:45 UTCJul 11, 01:10 UTC25m
2026-07-10 SKW5738 - Jul 10, 22:55 UTCJul 10, 23:15 UTC20m
2026-07-10 SKW5557 - Jul 10, 21:10 UTCJul 10, 21:30 UTC20m
2026-07-10 SKW5557 MRY → SFO Jul 10, 21:13 UTCJul 10, 21:36 UTC23m
2026-07-10 SKW338F - Jul 10, 19:55 UTCJul 10, 20:20 UTC25m
2026-07-10 SKW338F SFO → MRY Jul 10, 19:47 UTCJul 10, 20:13 UTC26m
2026-07-10 SKW5502 - Jul 10, 16:15 UTCJul 10, 16:40 UTC25m
2026-07-10 SKW410Z - Jul 10, 08:55 UTCJul 10, 09:20 UTC25m
2026-07-09 SKW4779 - Jul 9, 23:10 UTCJul 9, 23:55 UTC45m
2026-07-09 SKW4779 RNO → SFO Jul 9, 21:36 UTCJul 9, 23:52 UTC2h 16m
2026-07-09 SKW5707 - Jul 9, 19:45 UTCJul 9, 20:15 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 N954SW page for operator, model, and routing details .

Mode-S AD4528 frequently asked

What is Mode-S code AD4528?
AD4528 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N954SW.
Where is Mode-S AD4528 registered?
Mode-S code AD4528 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 AD4528 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4528, octal 53242450, decimal 11,355,432.
What flights does AD4528 operate?
Mode-S AD4528 has broadcast 20 distinct callsigns, including SKW5271, SKW5961, SKW5737, SKW5557, SKW4779.