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sensors Mode-S transponder

AD4171

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N953SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AD4171
Octal
53240561
Decimal
11,354,481
Country
US
Tail
N953SW
Type
CRJ2
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
703
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AD4171.

Country allocation

The ICAO 24-bit address AD4171 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
SKW5020 SkyWest Airlines 10 2026-07-25
SKW6065 - 7 2026-07-16
SKW5138 SkyWest Airlines 7 2026-07-26
SKW5087 SkyWest Airlines 7 2026-07-17
SKW5568 SkyWest Airlines 6 2026-07-21
SKW5224 - 6 2026-07-09
SKW5119 - 6 2026-07-18
SKW5100 - 6 2026-07-18
SKW5079 SkyWest Airlines 6 2026-06-13
SKW4736 - 6 2026-06-28
SKW768J - 5 2026-06-28
SKW5585 - 5 2026-07-10
SKW5436 SkyWest Airlines 5 2026-05-19
SKW5247 SkyWest Airlines 5 2026-04-25
SKW5107 - 5 2026-07-17
SKW5082 - 5 2026-06-17
SKW4797 SkyWest Airlines 5 2026-07-24
SKW5952 - 4 2026-07-09
SKW5817 - 4 2026-06-14
SKW5633 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW730V ORD → SLN Jul 26, 22:05 UTCJul 26, 22:15 UTC10m
2026-07-26 SKW5134 ORD → DEC Jul 26, 19:10 UTCJul 26, 20:25 UTC1h 15m
2026-07-26 SKW5138 ORD → CIU Jul 26, 17:05 UTCJul 26, 18:10 UTC1h 5m
2026-07-26 SKW5402 MKE → ORD Jul 26, 14:00 UTCJul 26, 14:40 UTC40m
2026-07-26 SKW5581 ORD → BNA Jul 26, 11:15 UTCJul 26, 11:40 UTC25m
2026-07-26 SKW5754 ORD → BTV Jul 26, 00:35 UTCJul 26, 01:50 UTC1h 15m
2026-07-25 SKW6098 SBN → ORD Jul 25, 22:40 UTCJul 25, 23:40 UTC1h 0m
2026-07-25 SKW6098 SBN → ORD Jul 25, 22:48 UTCJul 25, 23:45 UTC57m
2026-07-25 SKW5141 DEN → SGU Jul 25, 19:40 UTCJul 25, 20:30 UTC50m
2026-07-25 SKW416M ORD → PLN Jul 25, 17:40 UTCJul 25, 18:15 UTC35m
2026-07-25 SKW5020 DEC → ORD Jul 25, 14:00 UTCJul 25, 15:25 UTC1h 25m
2026-07-25 SKW5020 DEC → ORD Jul 25, 14:07 UTCJul 25, 15:18 UTC1h 11m
2026-07-25 SKW325H DEN → JLN Jul 25, 04:45 UTCJul 25, 06:05 UTC1h 20m
2026-07-25 SKW325H DEN → JLN Jul 25, 04:41 UTCJul 25, 06:04 UTC1h 23m
2026-07-25 SKW5474 SJC → DEN Jul 25, 00:50 UTCJul 25, 01:40 UTC50m
2026-07-25 SKW5474 SJC → DEN Jul 25, 01:01 UTCJul 25, 01:38 UTC37m
2026-07-24 SKW4797 LAX → EUG Jul 24, 23:15 UTCJul 24, 23:50 UTC35m
2026-07-24 SKW422W ORD → DEC Jul 24, 20:25 UTCJul 24, 21:50 UTC1h 25m
2026-07-24 SKW422W ORD → DEC Jul 24, 20:31 UTCJul 24, 21:47 UTC1h 16m
2026-07-24 SKW5015 BFF → DEN Jul 24, 17:35 UTCJul 24, 18:50 UTC1h 15m
2026-07-24 SKW5889 SDF → ORD Jul 24, 10:45 UTCJul 24, 11:15 UTC30m
2026-07-23 SKW701H ORD → MCW Jul 23, 23:30 UTCJul 23, 23:55 UTC25m
2026-07-23 SKW701H ORD → MCW Jul 23, 23:37 UTCJul 23, 23:59 UTC22m
2026-07-23 SKW5869 SFO → PSP Jul 23, 21:45 UTCJul 23, 22:10 UTC25m
2026-07-23 SKW5869 SFO → PSP Jul 23, 20:45 UTCJul 23, 22:10 UTC1h 25m
2026-07-23 SKW5869 SFO → PSP Jul 23, 20:34 UTCJul 23, 21:29 UTC55m
2026-07-23 SKW404F ORD → COU Jul 23, 18:50 UTCJul 23, 19:45 UTC55m
2026-07-23 SKW5263 SAT → SFO Jul 23, 15:50 UTCJul 23, 17:35 UTC1h 45m
2026-07-23 SKW5446 SFO → SBP Jul 23, 12:15 UTCJul 23, 13:40 UTC1h 25m
2026-07-21 SKW5568 ORD → MLI Jul 21, 18:20 UTCJul 21, 20:10 UTC1h 50m
2026-07-21 SKW5568 ORD → MLI Jul 21, 18:23 UTCJul 21, 19:56 UTC1h 33m
2026-07-21 SKW4798 ORD → CHA Jul 21, 16:02 UTCJul 21, 17:20 UTC1h 18m
2026-07-21 SKW4798 ORD → CHA Jul 21, 15:45 UTCJul 21, 17:20 UTC1h 35m
2026-07-21 SKW5997 PSP → SFO Jul 21, 13:35 UTCJul 21, 14:15 UTC40m
2026-07-21 SKW578A ORD → DEC Jul 21, 00:20 UTCJul 21, 00:55 UTC35m
2026-07-20 SKW5017 DEC → ORD Jul 20, 20:20 UTCJul 20, 21:15 UTC55m
2026-07-20 SKW465C - Jul 20, 17:20 UTCJul 20, 18:00 UTC40m
2026-07-20 SKW465C ORD → CMX Jul 20, 17:24 UTCJul 20, 18:20 UTC56m
2026-07-20 SKW6055 IAH → VCT Jul 20, 13:20 UTCJul 20, 14:55 UTC1h 35m
2026-07-19 SKW6060 EAR → DEN Jul 19, 22:20 UTCJul 19, 23:50 UTC1h 30m
2026-07-19 SKW5122 - Jul 19, 19:50 UTCJul 19, 20:40 UTC50m
2026-07-19 SKW702H - Jul 19, 18:15 UTCJul 19, 19:00 UTC45m
2026-07-19 SKW5653 - Jul 19, 01:30 UTCJul 19, 02:15 UTC45m
2026-07-19 SKW5653 MKE → ORD Jul 19, 01:39 UTCJul 19, 02:15 UTC36m
2026-07-19 SKW5555 ORD → MKE Jul 19, 00:10 UTCJul 19, 00:30 UTC20m
2026-07-18 SKW5675 SFO → RDD Jul 18, 22:10 UTCJul 18, 22:50 UTC40m
2026-07-18 SKW5675 SFO → RDD Jul 18, 22:03 UTCJul 18, 22:25 UTC22m
2026-07-18 SKW376K ORD → SLN Jul 18, 20:35 UTCJul 18, 21:00 UTC25m
2026-07-18 SKW5100 - Jul 18, 16:50 UTCJul 18, 17:50 UTC1h 0m
2026-07-18 SKW5119 - Jul 18, 13:55 UTCJul 18, 15:10 UTC1h 15m

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 N953SW page for operator, model, and routing details .

Mode-S AD4171 frequently asked

What is Mode-S code AD4171?
AD4171 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N953SW.
Where is Mode-S AD4171 registered?
Mode-S code AD4171 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 AD4171 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4171, octal 53240561, decimal 11,354,481.
What flights does AD4171 operate?
Mode-S AD4171 has broadcast 20 distinct callsigns, including SKW5020, SKW6065, SKW5138, SKW5087, SKW5568.