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sensors Mode-S transponder

A7DF23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N606SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A7DF23
Octal
51757443
Decimal
11,001,635
Country
US
Tail
N606SK
Type
CRJ7
No current signal · last broadcast Jul 11, 11:35 UTC
Flights observed
649
Distinct callsigns
20
Country
US
Last broadcast
Jul 11, 11:35 UTC

Last known position

Most recent position reported by Mode-S A7DF23.

Country allocation

The ICAO 24-bit address A7DF23 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
SKW6376 SkyWest Airlines 14 2026-06-01
SKW6363 - 13 2026-06-28
SKW6324 - 12 2026-06-19
SKW6364 SkyWest Airlines 9 2026-05-17
SKW6343 - 9 2026-07-10
SKW4887 SkyWest Airlines 9 2026-06-02
SKW6420 SkyWest Airlines 8 2026-05-16
SKW6372 SkyWest Airlines 8 2026-06-02
SKW6348 SkyWest Airlines 8 2026-06-15
SKW6290 - 8 2026-06-19
SKW6489 SkyWest Airlines 7 2026-05-11
SKW6452 SkyWest Airlines 7 2026-05-19
SKW6445 - 7 2026-07-02
SKW6437 SkyWest Airlines 7 2026-04-30
SKW6362 SkyWest Airlines 7 2026-05-17
SKW4909 - 7 2026-06-29
SKW4905 SkyWest Airlines 7 2026-06-03
SKW4900 - 7 2026-06-18
SKW6519 SkyWest Airlines 6 2026-06-27
SKW6517 - 6 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 SKW6511 - Jul 11, 11:20 UTCJul 11, 11:35 UTC15m
2026-07-11 SKW6339 - Jul 11, 01:00 UTCJul 11, 01:35 UTC35m
2026-07-11 SKW6339 DFW → SHV Jul 11, 01:00 UTCJul 11, 01:34 UTC34m
2026-07-10 SKW4820 - Jul 10, 21:50 UTCJul 10, 22:45 UTC55m
2026-07-10 SKW4820 GTR → DFW Jul 10, 21:32 UTCJul 10, 22:45 UTC1h 13m
2026-07-10 SKW4820 - Jul 10, 19:30 UTCJul 10, 20:20 UTC50m
2026-07-10 SKW6343 - Jul 10, 16:50 UTCJul 10, 17:35 UTC45m
2026-07-10 SKW6343 SJT → DFW Jul 10, 15:42 UTCJul 10, 17:25 UTC1h 43m
2026-07-10 SKW6343 - Jul 10, 14:00 UTCJul 10, 14:30 UTC30m
2026-07-10 SKW6511 - Jul 10, 11:25 UTCJul 10, 12:10 UTC45m
2026-07-10 SKW6339 DFW → SHV Jul 10, 01:00 UTCJul 10, 01:35 UTC35m
2026-07-10 SKW6339 DFW → SHV Jul 10, 01:00 UTCJul 10, 01:33 UTC33m
2026-07-09 SKW6337 - Jul 9, 22:35 UTCJul 9, 23:15 UTC40m
2026-07-09 SKW6337 SHV → DFW Jul 9, 22:35 UTCJul 9, 23:13 UTC38m
2026-07-09 SKW6337 - Jul 9, 21:05 UTCJul 9, 21:40 UTC35m
2026-07-09 SKW6343 - Jul 9, 16:10 UTCJul 9, 16:45 UTC35m
2026-07-09 SKW6343 SJT → DFW Jul 9, 16:00 UTCJul 9, 16:45 UTC45m
2026-07-09 SKW6343 - Jul 9, 13:50 UTCJul 9, 14:20 UTC30m
2026-07-09 SKW6195 - Jul 9, 11:10 UTCJul 9, 11:40 UTC30m
2026-07-09 SKW4999 DFW → LAW Jul 9, 04:00 UTCJul 9, 04:35 UTC35m
2026-07-08 SKW6256 - Jul 8, 20:55 UTCJul 8, 21:30 UTC35m
2026-07-08 SKW6256 SWO → DFW Jul 8, 20:50 UTCJul 8, 21:29 UTC39m
2026-07-08 SKW6256 - Jul 8, 19:15 UTCJul 8, 19:55 UTC40m
2026-07-08 SKW4890 - Jul 8, 16:20 UTCJul 8, 16:50 UTC30m
2026-07-08 SKW4890 DFW → ACT Jul 8, 15:05 UTCJul 8, 15:25 UTC20m
2026-07-08 SKW6331 - Jul 8, 11:30 UTCJul 8, 12:40 UTC1h 10m
2026-07-08 SKW6333 - Jul 8, 02:55 UTCJul 8, 04:00 UTC1h 5m
2026-07-08 SKW6333 DFW → ROW Jul 8, 02:54 UTCJul 8, 03:52 UTC58m
2026-07-07 SKW6413 SJC → PHX Jul 7, 17:55 UTCJul 7, 18:40 UTC45m
2026-07-07 SKW6413 SJC → PHX Jul 7, 16:10 UTCJul 7, 16:50 UTC40m
2026-07-07 SKW6408 - Jul 7, 11:45 UTCJul 7, 12:45 UTC1h 0m
2026-07-07 SKW6408 COS → DFW Jul 7, 11:45 UTCJul 7, 13:05 UTC1h 20m
2026-07-06 SKW6267 DFW → COS Jul 6, 22:50 UTCJul 7, 00:15 UTC1h 25m
2026-07-06 SKW6267 DFW → COS Jul 6, 22:46 UTCJul 7, 00:10 UTC1h 24m
2026-07-06 SKW6288 - Jul 6, 18:20 UTCJul 6, 19:25 UTC1h 5m
2026-07-06 SKW6288 ROW → DFW Jul 6, 18:15 UTCJul 6, 19:23 UTC1h 8m
2026-07-06 SKW6288 - Jul 6, 16:10 UTCJul 6, 17:15 UTC1h 5m
2026-07-06 SKW6302 - Jul 6, 11:55 UTCJul 6, 13:45 UTC1h 50m
2026-07-06 SKW6302 DRO → DFW Jul 6, 11:47 UTCJul 6, 13:40 UTC1h 53m
2026-07-06 SKW4981 - Jul 6, 03:25 UTCJul 6, 04:45 UTC1h 20m
2026-07-06 SKW4981 DFW → DRO Jul 6, 03:20 UTCJul 6, 04:55 UTC1h 35m
2026-07-06 SKW6344 - Jul 6, 00:55 UTCJul 6, 01:35 UTC40m
2026-07-06 SKW6344 SJT → DFW Jul 6, 00:41 UTCJul 6, 01:38 UTC57m
2026-07-05 SKW6344 - Jul 5, 23:20 UTCJul 5, 23:55 UTC35m
2026-07-05 SKW6413 SJC → PHX Jul 5, 19:10 UTCJul 5, 20:00 UTC50m
2026-07-05 SKW6413 SJC → PHX Jul 5, 16:20 UTCJul 5, 17:05 UTC45m
2026-07-05 SKW6203 OKC → DFW Jul 5, 14:05 UTCJul 5, 14:50 UTC45m
2026-07-04 SKW6487 - Jul 4, 02:15 UTCJul 4, 03:55 UTC1h 40m
2026-07-03 SKW6232 - Jul 3, 16:00 UTCJul 3, 16:30 UTC30m
2026-07-03 SKW6232 FWA → ORD Jul 3, 15:53 UTCJul 3, 16:28 UTC35m

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 N606SK page for operator, model, and routing details .

Mode-S A7DF23 frequently asked

What is Mode-S code A7DF23?
A7DF23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N606SK.
Where is Mode-S A7DF23 registered?
Mode-S code A7DF23 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 A7DF23 broadcasting right now?
No active broadcast right now. Last signal was Jul 11, 11:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7DF23, octal 51757443, decimal 11,001,635.
What flights does A7DF23 operate?
Mode-S A7DF23 has broadcast 20 distinct callsigns, including SKW6376, SKW6363, SKW6324, SKW6364, SKW6343.