Apparatus

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sensors Mode-S transponder

A71DC2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N558GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKY WEST AIRLINES INC

Hex
A71DC2
Octal
51616702
Decimal
10,952,130
Country
US
Tail
N558GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
420
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A71DC2.

Country allocation

The ICAO 24-bit address A71DC2 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
SKW4684 SkyWest Airlines 10 2026-07-21
SKW5977 - 9 2026-07-10
SKW5495 SkyWest Airlines 9 2026-07-21
SKW5643 - 7 2026-07-12
SKW5532 - 6 2026-07-10
SKW5500 - 6 2026-06-24
SKW5055 SkyWest Airlines 6 2026-07-22
SKW5950 - 5 2026-07-02
SKW5853 - 5 2026-07-09
SKW4685 - 5 2026-07-01
SKW4663 SkyWest Airlines 5 2026-07-19
SKW5958 - 4 2026-06-22
SKW5866 - 4 2026-07-05
SKW5851 - 4 2026-06-23
SKW5827 SkyWest Airlines 4 2026-07-04
SKW5714 SkyWest Airlines 4 2026-07-25
SKW5612 - 4 2026-06-19
SKW5609 SkyWest Airlines 4 2026-07-25
SKW5431 SkyWest Airlines 4 2026-05-30
SKW5399 SkyWest Airlines 4 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5197 BNA → ORD Jul 26, 19:20 UTCJul 26, 19:50 UTC30m
2026-07-26 SKW5407 ONT → SFO Jul 26, 14:05 UTCJul 26, 15:20 UTC1h 15m
2026-07-26 SKW5407 ONT → SFO Jul 26, 14:17 UTCJul 26, 15:20 UTC1h 3m
2026-07-25 SKW5714 SJC → DEN Jul 25, 18:41 UTCJul 25, 19:03 UTC22m
2026-07-25 SKW5714 SJC → DEN Jul 25, 18:25 UTCJul 25, 19:15 UTC50m
2026-07-25 SKW5234 MLI → ORD Jul 25, 16:35 UTCJul 25, 17:15 UTC40m
2026-07-25 SKW5609 SLC → SFO Jul 25, 13:15 UTCJul 25, 14:15 UTC1h 0m
2026-07-25 SKW378M ORD → COU Jul 25, 03:35 UTCJul 25, 04:20 UTC45m
2026-07-25 SKW4723 SAN → LAX Jul 25, 00:25 UTCJul 25, 01:10 UTC45m
2026-07-24 SKW4781 AUS → LAX Jul 24, 22:10 UTCJul 24, 22:50 UTC40m
2026-07-24 SKW4691 SFO → TUS Jul 24, 19:55 UTCJul 24, 20:45 UTC50m
2026-07-24 SKW4647 CHO → ORD Jul 24, 18:20 UTCJul 24, 19:00 UTC40m
2026-07-24 SKW5466 BOI → SFO Jul 24, 14:55 UTCJul 24, 16:15 UTC1h 20m
2026-07-24 SKW5466 BOI → SFO Jul 24, 14:52 UTCJul 24, 16:08 UTC1h 16m
2026-07-24 SKW5409 ORD → FAR Jul 24, 12:20 UTCJul 24, 13:20 UTC1h 0m
2026-07-24 SKW5409 ORD → FAR Jul 24, 12:33 UTCJul 24, 13:21 UTC48m
2026-07-24 SKW5957 SLC → SFO Jul 24, 00:15 UTCJul 24, 00:55 UTC40m
2026-07-23 SKW5813 SJC → DEN Jul 23, 22:50 UTCJul 23, 23:20 UTC30m
2026-07-23 SKW5813 SJC → DEN Jul 23, 23:03 UTCJul 23, 23:13 UTC10m
2026-07-23 SKW5754 ORD → BTV Jul 23, 16:40 UTCJul 23, 18:05 UTC1h 25m
2026-07-23 SKW5819 SFO → ASE Jul 23, 14:25 UTCJul 23, 15:15 UTC50m
2026-07-23 SKW5076 CIU → ORD Jul 23, 10:05 UTCJul 23, 11:10 UTC1h 5m
2026-07-22 SKW5055 DEN → GCC Jul 22, 22:35 UTCJul 23, 00:00 UTC1h 25m
2026-07-22 SKW5055 DEN → GCC Jul 22, 19:25 UTCJul 22, 20:50 UTC1h 25m
2026-07-22 SKW473M ORD → CIU Jul 22, 16:40 UTCJul 22, 17:30 UTC50m
2026-07-22 SKW5609 - Jul 22, 13:15 UTCJul 22, 14:10 UTC55m
2026-07-22 SKW378M ORD → COU Jul 22, 03:35 UTCJul 22, 04:15 UTC40m
2026-07-21 SKW5336 FAT → SFO Jul 21, 23:50 UTCJul 22, 01:40 UTC1h 50m
2026-07-21 SKW4742 ELP → ORD Jul 21, 21:30 UTCJul 21, 22:45 UTC1h 15m
2026-07-21 SKW4778 MKE → ORD Jul 21, 18:15 UTCJul 21, 19:40 UTC1h 25m
2026-07-21 SKW4688 DEN → FAR Jul 21, 15:55 UTCJul 21, 17:25 UTC1h 30m
2026-07-21 SKW5495 ORD → MKE Jul 21, 13:25 UTCJul 21, 14:15 UTC50m
2026-07-21 SKW4684 DEN → SAF Jul 21, 01:45 UTCJul 21, 02:30 UTC45m
2026-07-21 SKW4684 DEN → SAF Jul 21, 01:37 UTCJul 21, 02:29 UTC52m
2026-07-20 SKW5472 ORD → CHA Jul 20, 22:35 UTCJul 20, 23:55 UTC1h 19m
2026-07-20 SKW394Y DEN → MAF Jul 20, 19:50 UTCJul 20, 21:05 UTC1h 15m
2026-07-20 SKW5685 XWA → DEN Jul 20, 16:50 UTCJul 20, 18:15 UTC1h 25m
2026-07-20 SKW424M - Jul 20, 14:15 UTCJul 20, 14:50 UTC35m
2026-07-20 SKW4738 SLC → ORD Jul 20, 11:20 UTCJul 20, 12:35 UTC1h 15m
2026-07-20 SKW700V DEN → DVL Jul 20, 03:15 UTCJul 20, 04:30 UTC1h 15m
2026-07-20 SKW5551 - Jul 20, 00:10 UTCJul 20, 01:10 UTC1h 0m
2026-07-19 SKW395Z DEN → IDA Jul 19, 21:50 UTCJul 19, 22:45 UTC55m
2026-07-19 SKW4663 DEN → BIS Jul 19, 16:15 UTCJul 19, 20:30 UTC4h 15m
2026-07-19 SKW4696 - Jul 19, 13:15 UTCJul 19, 13:35 UTC20m
2026-07-19 SKW764Y DEN → COS Jul 19, 03:30 UTCJul 19, 03:45 UTC15m
2026-07-17 SKW5495 - Jul 17, 13:29 UTCJul 17, 14:24 UTC55m
2026-07-17 SKW4684 - Jul 17, 02:39 UTCJul 17, 03:20 UTC40m
2026-07-16 SKW4807 - Jul 16, 19:05 UTCJul 16, 20:29 UTC1h 25m
2026-07-16 SKW5333 - Jul 16, 16:25 UTCJul 16, 17:40 UTC1h 15m
2026-07-16 SKW5367 DEN → DEN Jul 16, 01:20 UTCJul 16, 13:40 UTC12h 20m

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 N558GJ page for operator, model, and routing details .

Mode-S A71DC2 frequently asked

What is Mode-S code A71DC2?
A71DC2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N558GJ.
Where is Mode-S A71DC2 registered?
Mode-S code A71DC2 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 A71DC2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A71DC2, octal 51616702, decimal 10,952,130.
What flights does A71DC2 operate?
Mode-S A71DC2 has broadcast 20 distinct callsigns, including SKW4684, SKW5977, SKW5495, SKW5643, SKW5532.