Apparatus

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sensors Mode-S transponder

A25278

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249LR · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
A25278
Octal
50451170
Decimal
10,637,944
Country
US
Tail
N249LR
Type
CRJ9
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
791
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A25278.

Country allocation

The ICAO 24-bit address A25278 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 - 36 2026-07-21
SKW6276 SkyWest Airlines 27 2026-07-26
SKW4994 - 27 2026-07-19
SKW4991 - 27 2026-07-18
SKW6394 SkyWest Airlines 25 2026-07-24
SKW4821 - 24 2026-06-25
SKW4921 SkyWest Airlines 23 2026-07-26
SKW6422 SkyWest Airlines 22 2026-07-23
SKW4820 - 22 2026-07-16
SKW4812 SkyWest Airlines 22 2026-07-26
SKW4816 - 20 2026-07-16
SKW4817 - 19 2026-07-03
SKW4811 SkyWest Airlines 19 2026-07-26
SKW6318 - 18 2026-07-20
SKW4813 SkyWest Airlines 18 2026-07-23
SKW6406 SkyWest Airlines 17 2026-07-22
SKW6268 SkyWest Airlines 17 2026-07-23
SKW6367 SkyWest Airlines 14 2026-05-20
SKW6242 SkyWest Airlines 14 2026-05-14
SKW4935 SkyWest Airlines 14 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6276 LAX → SFO Jul 26, 20:35 UTCJul 26, 22:00 UTC1h 25m
2026-07-26 SKW4812 OKC → PHX Jul 26, 18:40 UTCJul 26, 19:20 UTC40m
2026-07-26 SKW4812 OKC → PHX Jul 26, 18:30 UTCJul 26, 19:17 UTC47m
2026-07-26 SKW4811 PHX → SGU Jul 26, 16:20 UTCJul 26, 16:40 UTC20m
2026-07-26 SKW6327 SLC → PHX Jul 26, 13:25 UTCJul 26, 14:40 UTC1h 15m
2026-07-26 SKW4921 ORD → CVG Jul 26, 04:30 UTCJul 26, 05:35 UTC1h 5m
2026-07-26 SKW4927 SFO → LAX Jul 26, 02:05 UTCJul 26, 03:15 UTC1h 10m
2026-07-26 SKW4927 SFO → LAX Jul 26, 00:05 UTCJul 26, 01:15 UTC1h 10m
2026-07-25 SKW6373 PHX → MFR Jul 25, 22:15 UTCJul 25, 22:40 UTC25m
2026-07-25 SKW6373 PHX → MFR Jul 25, 22:10 UTCJul 25, 22:36 UTC26m
2026-07-25 SKW6373 PHX → MFR Jul 25, 20:50 UTCJul 25, 21:20 UTC30m
2026-07-25 SKW4812 OKC → PHX Jul 25, 18:55 UTCJul 25, 19:35 UTC40m
2026-07-25 SKW4812 OKC → PHX Jul 25, 18:45 UTCJul 25, 19:32 UTC47m
2026-07-25 SKW4811 PHX → SGU Jul 25, 16:50 UTCJul 25, 17:25 UTC35m
2026-07-25 SKW6453 YUM → PHX Jul 25, 13:20 UTCJul 25, 15:40 UTC2h 20m
2026-07-25 SKW6453 YUM → PHX Jul 25, 13:16 UTCJul 25, 15:39 UTC2h 23m
2026-07-25 SKW6452 ORD → FNT Jul 25, 02:15 UTCJul 25, 04:30 UTC2h 15m
2026-07-25 SKW6452 ORD → FNT Jul 25, 02:10 UTCJul 25, 04:25 UTC2h 15m
2026-07-24 SKW6415 LCH → DFW Jul 24, 23:55 UTCJul 25, 01:00 UTC1h 5m
2026-07-24 SKW6415 LCH → DFW Jul 24, 21:55 UTCJul 24, 22:55 UTC1h 0m
2026-07-24 SKW6394 LAX → DEN Jul 24, 19:20 UTCJul 24, 20:30 UTC1h 10m
2026-07-24 SKW6394 LAX → DEN Jul 24, 19:14 UTCJul 24, 20:29 UTC1h 15m
2026-07-24 SKW6394 LAX → DEN Jul 24, 17:25 UTCJul 24, 18:25 UTC1h 0m
2026-07-24 SKW6453 YUM → PHX Jul 24, 13:25 UTCJul 24, 15:45 UTC2h 20m
2026-07-24 SKW6452 ORD → FNT Jul 24, 02:15 UTCJul 24, 04:30 UTC2h 15m
2026-07-23 SKW6268 ORD → ICT Jul 23, 23:25 UTCJul 24, 00:55 UTC1h 30m
2026-07-23 SKW6268 ORD → ICT Jul 23, 21:10 UTCJul 23, 22:30 UTC1h 20m
2026-07-23 SKW6422 SAT → DFW Jul 23, 18:30 UTCJul 23, 19:45 UTC1h 15m
2026-07-23 SKW6422 SAT → DFW Jul 23, 15:50 UTCJul 23, 17:10 UTC1h 20m
2026-07-23 SKW4810 SGU → PHX Jul 23, 13:40 UTCJul 23, 14:20 UTC40m
2026-07-23 SKW4813 PHX → SGU Jul 23, 00:40 UTCJul 23, 01:40 UTC1h 0m
2026-07-23 SKW4813 PHX → SGU Jul 23, 00:38 UTCJul 23, 01:49 UTC1h 11m
2026-07-22 SKW6394 LAX → DEN Jul 22, 22:15 UTCJul 22, 23:25 UTC1h 10m
2026-07-22 SKW6394 LAX → DEN Jul 22, 22:07 UTCJul 22, 23:23 UTC1h 16m
2026-07-22 SKW6394 LAX → DEN Jul 22, 20:20 UTCJul 22, 21:20 UTC1h 0m
2026-07-22 SKW4812 OKC → PHX Jul 22, 18:30 UTCJul 22, 19:10 UTC40m
2026-07-22 SKW4812 OKC → PHX Jul 22, 18:19 UTCJul 22, 19:05 UTC46m
2026-07-22 SKW4811 PHX → SGU Jul 22, 16:25 UTCJul 22, 16:55 UTC30m
2026-07-22 SKW6406 PSP → PHX Jul 22, 13:55 UTCJul 22, 14:35 UTC40m
2026-07-22 SKW4928 LAX → SFO Jul 22, 03:35 UTCJul 22, 04:55 UTC1h 20m
2026-07-22 SKW4928 LAX → SFO Jul 22, 00:30 UTCJul 22, 01:45 UTC1h 15m
2026-07-21 SKW4935 OMA → ORD Jul 21, 21:50 UTCJul 21, 22:10 UTC20m
2026-07-21 SKW4935 OMA → ORD Jul 21, 20:30 UTCJul 21, 20:55 UTC25m
2026-07-21 SKW6369 - Jul 21, 18:55 UTCJul 21, 19:20 UTC25m
2026-07-21 SKW6369 TUS → PHX Jul 21, 18:52 UTCJul 21, 19:17 UTC25m
2026-07-21 SKW6369 - Jul 21, 17:25 UTCJul 21, 17:55 UTC30m
2026-07-21 SKW6453 YUM → PHX Jul 21, 13:35 UTCJul 21, 15:55 UTC2h 20m
2026-07-21 SKW6452 ORD → FNT Jul 21, 02:45 UTCJul 21, 05:15 UTC2h 30m
2026-07-20 SKW6276 LAX → SFO Jul 20, 23:25 UTCJul 21, 01:40 UTC2h 14m
2026-07-20 SKW6276 LAX → SFO Jul 20, 20:30 UTCJul 20, 22:30 UTC2h 0m

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 N249LR page for operator, model, and routing details .

Mode-S A25278 frequently asked

What is Mode-S code A25278?
A25278 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249LR.
Where is Mode-S A25278 registered?
Mode-S code A25278 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 A25278 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25278, octal 50451170, decimal 10,637,944.
What flights does A25278 operate?
Mode-S A25278 has broadcast 20 distinct callsigns, including SKW6369, SKW6276, SKW4994, SKW4991, SKW6394.