Apparatus

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sensors Mode-S transponder

A7D3FE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N603SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A7D3FE
Octal
51751776
Decimal
10,998,782
Country
US
Tail
N603SK
Type
CRJ7
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
522
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A7D3FE.

Country allocation

The ICAO 24-bit address A7D3FE 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
SKW5661 - 11 2026-07-16
SKW5950 - 9 2026-07-07
SKW5649 - 9 2026-07-11
SKW5462 - 9 2026-07-15
SKW4731 - 9 2026-07-16
SKW5831 - 8 2026-07-11
SKW5666 - 7 2026-07-08
SKW5495 - 7 2026-07-09
SKW5221 - 7 2026-07-12
SKW5878 - 6 2026-07-12
SKW5866 - 6 2026-07-06
SKW5824 - 6 2026-07-06
SKW5556 - 6 2026-07-08
SKW5551 - 6 2026-07-06
SKW5346 - 6 2026-06-22
SKW4738 - 6 2026-07-16
SKW4684 - 6 2026-07-09
SKW5912 - 5 2026-07-14
SKW5805 - 5 2026-07-08
SKW5563 SkyWest Airlines 5 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4691 SFO → TUS Jul 26, 19:50 UTCJul 26, 20:35 UTC45m
2026-07-26 SKW4647 CHO → ORD Jul 26, 18:00 UTCJul 26, 18:30 UTC30m
2026-07-26 SKW5657 SHV → IAH Jul 26, 15:50 UTCJul 26, 16:25 UTC35m
2026-07-26 SKW5656 DEN → IDA Jul 26, 14:15 UTCJul 26, 14:35 UTC20m
2026-07-26 SKW5699 IND → ORD Jul 26, 10:40 UTCJul 26, 12:10 UTC1h 30m
2026-07-25 SKW354Y ORD → FOD Jul 25, 23:15 UTCJul 26, 00:35 UTC1h 20m
2026-07-25 SKW5686 FNT → ORD Jul 25, 20:15 UTCJul 25, 20:55 UTC40m
2026-07-25 SKW6033 ORD → MSY Jul 25, 18:05 UTCJul 25, 18:40 UTC35m
2026-07-25 SKW6034 ROC → ORD Jul 25, 15:00 UTCJul 25, 16:30 UTC1h 30m
2026-07-25 SKW5919 JAC → SFO Jul 25, 12:23 UTCJul 25, 13:21 UTC58m
2026-07-25 SKW5919 JAC → SFO Jul 25, 12:05 UTCJul 25, 13:25 UTC1h 20m
2026-07-25 SKW6089 FWA → FAR Jul 25, 03:30 UTCJul 25, 05:10 UTC1h 40m
2026-07-24 SKW5202 SBN → IAH Jul 24, 01:50 UTCJul 24, 05:00 UTC3h 10m
2026-07-22 SKW5537 PWK → FAR Jul 22, 14:00 UTCJul 22, 15:30 UTC1h 30m
2026-07-22 SKW5896 SFO → BUR Jul 22, 11:40 UTCJul 22, 12:20 UTC40m
2026-07-22 SKW4711 DAY → ORD Jul 22, 01:15 UTCJul 22, 01:35 UTC20m
2026-07-21 SKW5865 BNA → ORD Jul 21, 22:30 UTCJul 21, 22:50 UTC20m
2026-07-21 SKW5865 BNA → ORD Jul 21, 22:38 UTCJul 21, 22:54 UTC16m
2026-07-21 SKW5505 - Jul 21, 21:10 UTCJul 21, 21:25 UTC15m
2026-07-21 SKW5505 ORD → SBN Jul 21, 21:14 UTCJul 21, 21:21 UTC7m
2026-07-21 SKW4748 GRB → ORD Jul 21, 18:40 UTCJul 21, 19:15 UTC35m
2026-07-21 SKW5720 SFO → BOI Jul 21, 17:15 UTCJul 21, 17:30 UTC15m
2026-07-21 SKW4646 CAK → ORD Jul 21, 11:05 UTCJul 21, 12:15 UTC1h 10m
2026-07-21 SKW5982 SBA → SFO Jul 21, 03:05 UTCJul 21, 03:50 UTC45m
2026-07-20 SKW5516 SAV → ORD Jul 20, 22:35 UTCJul 20, 23:05 UTC30m
2026-07-20 SKW5250 ORD → SAV Jul 20, 19:30 UTCJul 20, 20:00 UTC30m
2026-07-20 SKW5470 ORD → CHA Jul 20, 16:45 UTCJul 20, 18:05 UTC1h 20m
2026-07-20 SKW5470 ORD → CHA Jul 20, 16:43 UTCJul 20, 17:54 UTC1h 11m
2026-07-20 SKW5407 - Jul 20, 14:35 UTCJul 20, 15:50 UTC1h 15m
2026-07-20 SKW5699 - Jul 20, 10:55 UTCJul 20, 12:20 UTC1h 25m
2026-07-19 SKW5610 - Jul 19, 23:05 UTCJul 20, 00:15 UTC1h 10m
2026-07-19 SKW5686 FNT → ORD Jul 19, 20:15 UTCJul 19, 21:20 UTC1h 5m
2026-07-19 SKW6033 ORD → MSY Jul 19, 18:30 UTCJul 19, 19:00 UTC30m
2026-07-19 SKW5399 BWI → LGA Jul 19, 16:10 UTCJul 19, 16:50 UTC40m
2026-07-19 SKW5842 - Jul 19, 15:05 UTCJul 19, 15:25 UTC20m
2026-07-19 SKW5598 - Jul 19, 12:15 UTCJul 19, 12:45 UTC30m
2026-07-19 SKW6096 COS → DEN Jul 19, 05:30 UTCJul 19, 06:40 UTC1h 10m
2026-07-19 SKW6096 COS → DEN Jul 19, 03:49 UTCJul 19, 06:58 UTC3h 9m
2026-07-18 SKW4742 - Jul 18, 22:50 UTCJul 19, 00:00 UTC1h 10m
2026-07-18 SKW4742 ORD → MEM Jul 18, 22:02 UTCJul 19, 00:00 UTC1h 58m
2026-07-18 SKW4778 - Jul 18, 19:20 UTCJul 18, 20:40 UTC1h 20m
2026-07-18 SKW4688 DEN → FAR Jul 18, 15:55 UTCJul 18, 17:20 UTC1h 25m
2026-07-18 SKW5239 - Jul 18, 10:55 UTCJul 18, 12:20 UTC1h 25m
2026-07-18 SKW5964 DEN → FAR Jul 18, 03:05 UTCJul 18, 04:30 UTC1h 25m
2026-07-17 SKW5528 - Jul 17, 18:15 UTCJul 17, 22:05 UTC3h 50m
2026-07-17 SKW4725 COS → DEN Jul 17, 14:55 UTCJul 17, 15:25 UTC30m
2026-07-17 SKW5669 DEN → COS Jul 17, 02:20 UTCJul 17, 02:39 UTC20m
2026-07-16 SKW5431 LNK → DEN Jul 16, 22:19 UTCJul 16, 23:25 UTC1h 5m
2026-07-16 SKW5827 PSP → SFO Jul 16, 20:09 UTCJul 16, 21:10 UTC1h 0m
2026-07-16 SKW5661 - Jul 16, 16:49 UTCJul 16, 17:45 UTC55m

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 N603SK page for operator, model, and routing details .

Mode-S A7D3FE frequently asked

What is Mode-S code A7D3FE?
A7D3FE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N603SK.
Where is Mode-S A7D3FE registered?
Mode-S code A7D3FE 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 A7D3FE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7D3FE, octal 51751776, decimal 10,998,782.
What flights does A7D3FE operate?
Mode-S A7D3FE has broadcast 20 distinct callsigns, including SKW5661, SKW5950, SKW5649, SKW5462, SKW4731.