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sensors Mode-S transponder

A2439C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N245LR · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
A2439C
Octal
50441634
Decimal
10,634,140
Country
US
Tail
N245LR
Type
CRJ9
No current signal · last broadcast Jul 21, 21:50 UTC
Flights observed
719
Distinct callsigns
20
Country
US
Last broadcast
Jul 21, 21:50 UTC

Last known position

Most recent position reported by Mode-S A2439C.

Country allocation

The ICAO 24-bit address A2439C 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
SKW6369 - 44 2026-07-16
SKW6453 - 23 2026-07-19
SKW6422 - 22 2026-07-18
SKW6394 - 21 2026-07-19
SKW4813 SkyWest Airlines 21 2026-07-17
SKW4935 - 20 2026-07-14
SKW4811 - 20 2026-07-13
SKW6406 SkyWest Airlines 19 2026-07-20
SKW6373 - 19 2026-07-20
SKW6268 - 19 2026-07-18
SKW4922 - 19 2026-07-20
SKW6452 - 17 2026-07-19
SKW4994 - 17 2026-06-26
SKW4991 - 17 2026-07-04
SKW4928 - 17 2026-07-17
SKW4815 - 17 2026-06-27
SKW4810 - 17 2026-07-18
SKW6318 - 16 2026-07-21
SKW6341 SkyWest Airlines 15 2026-05-18
SKW4812 - 15 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 SKW9918 DFW → SBN Jul 21, 17:15 UTCJul 21, 21:50 UTC4h 35m
2026-07-21 SKW9918 DFW → SBN Jul 21, 17:06 UTCJul 21, 21:53 UTC4h 47m
2026-07-21 SKW6431 GJT → PHX Jul 21, 15:15 UTCJul 21, 16:15 UTC1h 0m
2026-07-21 SKW6431 GJT → PHX Jul 21, 15:06 UTCJul 21, 16:14 UTC1h 8m
2026-07-21 SKW6318 - Jul 21, 05:20 UTCJul 21, 06:25 UTC1h 5m
2026-07-21 SKW4927 SFO → LAX Jul 21, 02:00 UTCJul 21, 03:15 UTC1h 15m
2026-07-21 SKW4927 SFO → LAX Jul 21, 00:00 UTCJul 21, 01:05 UTC1h 5m
2026-07-20 SKW6373 TUS → PHX Jul 20, 22:05 UTCJul 20, 22:30 UTC25m
2026-07-20 SKW6373 TUS → PHX Jul 20, 22:04 UTCJul 20, 22:36 UTC32m
2026-07-20 SKW6373 PHX → TUS Jul 20, 20:50 UTCJul 20, 21:20 UTC30m
2026-07-20 SKW6406 PSP → PHX Jul 20, 17:10 UTCJul 20, 17:55 UTC45m
2026-07-20 SKW6406 PSP → PHX Jul 20, 17:05 UTCJul 20, 17:55 UTC50m
2026-07-20 SKW285R - Jul 20, 15:25 UTCJul 20, 16:00 UTC35m
2026-07-20 SKW4922 - Jul 20, 04:40 UTCJul 20, 06:05 UTC1h 25m
2026-07-20 SKW4922 - Jul 20, 03:40 UTCJul 20, 04:10 UTC30m
2026-07-20 SKW6415 LCH → DFW Jul 20, 00:00 UTCJul 20, 01:05 UTC1h 5m
2026-07-19 SKW6415 LCH → DFW Jul 19, 22:05 UTCJul 19, 23:05 UTC1h 0m
2026-07-19 SKW6394 BFL → PHX Jul 19, 19:25 UTCJul 19, 20:47 UTC1h 22m
2026-07-19 SKW6394 PHX → BFL Jul 19, 17:20 UTCJul 19, 18:20 UTC1h 0m
2026-07-19 SKW6453 FSD → PHX Jul 19, 13:30 UTCJul 19, 15:45 UTC2h 15m
2026-07-19 SKW6452 - Jul 19, 02:20 UTCJul 19, 04:45 UTC2h 25m
2026-07-19 SKW6452 PHX → FSD Jul 19, 02:19 UTCJul 19, 04:41 UTC2h 22m
2026-07-18 SKW6268 - Jul 18, 23:30 UTCJul 19, 00:55 UTC1h 25m
2026-07-18 SKW6268 - Jul 18, 21:10 UTCJul 18, 22:25 UTC1h 15m
2026-07-18 SKW6422 SLC → PHX Jul 18, 18:35 UTCJul 18, 19:50 UTC1h 15m
2026-07-18 SKW6422 - Jul 18, 16:00 UTCJul 18, 17:10 UTC1h 10m
2026-07-18 SKW4810 - Jul 18, 13:40 UTCJul 18, 14:25 UTC45m
2026-07-17 SKW4813 PHX → SGU Jul 17, 22:00 UTCJul 17, 22:40 UTC40m
2026-07-17 SKW6394 - Jul 17, 19:15 UTCJul 17, 20:40 UTC1h 25m
2026-07-17 SKW6394 BFL → PHX Jul 17, 19:13 UTCJul 17, 20:35 UTC1h 22m
2026-07-17 SKW6394 - Jul 17, 17:35 UTCJul 17, 18:40 UTC1h 5m
2026-07-17 SKW4928 SLC → PHX Jul 17, 02:17 UTCJul 17, 03:27 UTC1h 10m
2026-07-17 SKW4928 - Jul 17, 02:20 UTCJul 17, 02:59 UTC40m
2026-07-16 SKW4928 PHX → SLC Jul 16, 23:59 UTCJul 17, 01:09 UTC1h 10m
2026-07-16 SKW6373 - Jul 16, 22:15 UTCJul 16, 22:49 UTC35m
2026-07-16 SKW6373 PHX → TUS Jul 16, 20:45 UTCJul 16, 21:10 UTC25m
2026-07-16 SKW6369 - Jul 16, 18:40 UTCJul 16, 19:05 UTC25m
2026-07-16 SKW6369 - Jul 16, 17:35 UTCJul 16, 18:00 UTC25m
2026-07-16 SKW6431 - Jul 16, 15:14 UTCJul 16, 16:19 UTC1h 5m
2026-07-16 SKW6431 GJT → PHX Jul 16, 14:49 UTCJul 16, 16:18 UTC1h 29m
2026-07-16 SKW6318 - Jul 16, 05:10 UTCJul 16, 06:20 UTC1h 10m
2026-07-16 SKW6318 PHX → GJT Jul 16, 05:05 UTCJul 16, 06:08 UTC1h 3m
2026-07-16 SKW4944 BUR → PHX Jul 16, 01:55 UTCJul 16, 03:05 UTC1h 10m
2026-07-16 SKW4944 PHX → BUR Jul 16, 00:00 UTCJul 16, 01:05 UTC1h 5m
2026-07-15 SKW6373 - Jul 15, 22:15 UTCJul 15, 22:35 UTC20m
2026-07-15 SKW6373 TUS → PHX Jul 15, 22:11 UTCJul 15, 22:34 UTC23m
2026-07-15 SKW6373 PHX → TUS Jul 15, 20:50 UTCJul 15, 21:20 UTC30m
2026-07-15 SKW4978 - Jul 15, 18:30 UTCJul 15, 19:05 UTC35m
2026-07-15 SKW4978 ELP → PHX Jul 15, 18:04 UTCJul 15, 19:02 UTC58m
2026-07-15 SKW4978 - Jul 15, 16:10 UTCJul 15, 16:40 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 N245LR page for operator, model, and routing details .

Mode-S A2439C frequently asked

What is Mode-S code A2439C?
A2439C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N245LR.
Where is Mode-S A2439C registered?
Mode-S code A2439C 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 A2439C broadcasting right now?
No active broadcast right now. Last signal was Jul 21, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2439C, octal 50441634, decimal 10,634,140.
What flights does A2439C operate?
Mode-S A2439C has broadcast 20 distinct callsigns, including SKW6369, SKW6453, SKW6422, SKW6394, SKW4813.