Apparatus

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sensors Mode-S transponder

AB4508

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N825SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB4508
Octal
52642410
Decimal
11,224,328
Country
US
Tail
N825SK
Type
CRJ9
No current signal · last broadcast Jul 25, 06:10 UTC
Flights observed
623
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 06:10 UTC

Last known position

Most recent position reported by Mode-S AB4508.

Country allocation

The ICAO 24-bit address AB4508 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
SKW4991 - 24 2026-07-06
SKW4810 SkyWest Airlines 24 2026-07-19
SKW6394 - 23 2026-07-20
SKW4813 SkyWest Airlines 22 2026-07-18
SKW4811 SkyWest Airlines 19 2026-07-24
SKW4821 - 17 2026-07-05
SKW4815 - 17 2026-06-26
SKW4812 SkyWest Airlines 17 2026-07-24
SKW6235 - 16 2026-07-11
SKW4922 SkyWest Airlines 16 2026-07-25
SKW4820 - 16 2026-06-26
SKW6422 - 15 2026-07-22
SKW6367 SkyWest Airlines 15 2026-05-19
SKW6406 SkyWest Airlines 14 2026-07-24
SKW6248 SkyWest Airlines 14 2026-05-03
SKW4994 - 14 2026-07-07
SKW4927 SkyWest Airlines 14 2026-07-24
SKW4817 - 14 2026-07-06
SKW6276 SkyWest Airlines 13 2026-07-24
SKW4935 - 12 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 SKW4922 SLC → PHX Jul 25, 05:40 UTCJul 25, 06:10 UTC30m
2026-07-24 SKW6276 LAX → SFO Jul 24, 23:30 UTCJul 25, 01:30 UTC2h 0m
2026-07-24 SKW6276 LAX → SFO Jul 24, 20:25 UTCJul 24, 22:35 UTC2h 10m
2026-07-24 SKW4812 OKC → PHX Jul 24, 18:25 UTCJul 24, 19:05 UTC40m
2026-07-24 SKW4811 PHX → SGU Jul 24, 16:10 UTCJul 24, 16:35 UTC25m
2026-07-24 SKW6406 PSP → PHX Jul 24, 13:45 UTCJul 24, 14:30 UTC45m
2026-07-24 SKW4922 SLC → PHX Jul 24, 05:55 UTCJul 24, 06:20 UTC25m
2026-07-24 SKW4927 SFO → LAX Jul 24, 01:55 UTCJul 24, 03:05 UTC1h 10m
2026-07-23 SKW4927 SFO → LAX Jul 23, 23:55 UTCJul 24, 01:05 UTC1h 10m
2026-07-23 SKW6373 PHX → MFR Jul 23, 22:20 UTCJul 23, 22:45 UTC25m
2026-07-23 SKW6373 PHX → MFR Jul 23, 21:00 UTCJul 23, 21:25 UTC25m
2026-07-23 SKW6369 ORD → FAR Jul 23, 18:50 UTCJul 23, 19:15 UTC25m
2026-07-23 SKW6369 ORD → FAR Jul 23, 18:45 UTCJul 23, 19:20 UTC35m
2026-07-23 SKW6369 ORD → FAR Jul 23, 17:35 UTCJul 23, 18:00 UTC25m
2026-07-23 SKW6453 YUM → PHX Jul 23, 13:30 UTCJul 23, 15:55 UTC2h 25m
2026-07-23 SKW6452 ORD → FNT Jul 23, 02:30 UTCJul 23, 05:00 UTC2h 30m
2026-07-22 SKW6268 ORD → ICT Jul 22, 23:30 UTCJul 23, 01:00 UTC1h 30m
2026-07-22 SKW6268 ORD → ICT Jul 22, 21:05 UTCJul 22, 22:25 UTC1h 20m
2026-07-22 SKW6422 SLC → PHX Jul 22, 18:30 UTCJul 22, 19:40 UTC1h 10m
2026-07-22 SKW6422 SLC → PHX Jul 22, 18:27 UTCJul 22, 19:40 UTC1h 13m
2026-07-22 SKW6422 PHX → SLC Jul 22, 15:55 UTCJul 22, 17:10 UTC1h 15m
2026-07-22 SKW4889 ORD → BNA Jul 22, 11:40 UTCJul 22, 13:10 UTC1h 30m
2026-07-22 SKW4889 ORD → BNA Jul 22, 11:37 UTCJul 22, 13:07 UTC1h 30m
2026-07-22 SKW5009 DFW → BRO Jul 22, 03:15 UTCJul 22, 04:35 UTC1h 20m
2026-07-21 SKW6276 LAX → SFO Jul 21, 23:25 UTCJul 22, 01:15 UTC1h 50m
2026-07-21 SKW6276 LAX → SFO Jul 21, 20:25 UTCJul 21, 22:20 UTC1h 55m
2026-07-21 SKW4812 OKC → PHX Jul 21, 18:35 UTCJul 21, 19:20 UTC45m
2026-07-21 SKW4811 PHX → SGU Jul 21, 16:35 UTCJul 21, 17:10 UTC35m
2026-07-21 SKW6406 PSP → PHX Jul 21, 13:45 UTCJul 21, 14:25 UTC40m
2026-07-21 SKW6406 PSP → PHX Jul 21, 13:40 UTCJul 21, 14:24 UTC44m
2026-07-21 SKW4922 SLC → PHX Jul 21, 06:05 UTCJul 21, 06:35 UTC30m
2026-07-20 SKW6394 BFL → PHX Jul 20, 19:15 UTCJul 20, 20:30 UTC1h 15m
2026-07-20 SKW6394 BFL → PHX Jul 20, 19:14 UTCJul 20, 20:22 UTC1h 8m
2026-07-20 SKW6394 PHX → BFL Jul 20, 17:20 UTCJul 20, 18:20 UTC1h 0m
2026-07-20 SKW6453 FSD → PHX Jul 20, 13:25 UTCJul 20, 15:45 UTC2h 20m
2026-07-20 SKW6452 ORD → FNT Jul 20, 03:20 UTCJul 20, 05:40 UTC2h 20m
2026-07-19 SKW6268 ORD → ICT Jul 19, 23:25 UTCJul 20, 00:55 UTC1h 30m
2026-07-19 SKW6268 ORD → ICT Jul 19, 21:05 UTCJul 19, 22:20 UTC1h 15m
2026-07-19 SKW4978 ELP → PHX Jul 19, 17:51 UTCJul 19, 18:44 UTC53m
2026-07-19 SKW4978 - Jul 19, 16:05 UTCJul 19, 16:35 UTC30m
2026-07-19 SKW4810 SGU → PHX Jul 19, 14:15 UTCJul 19, 14:55 UTC40m
2026-07-18 SKW4813 PHX → SGU Jul 18, 21:51 UTCJul 18, 22:46 UTC55m
2026-07-18 SKW4813 PHX → SGU Jul 18, 21:55 UTCJul 18, 22:35 UTC40m
2026-07-18 SKW6394 BFL → PHX Jul 18, 19:30 UTCJul 18, 20:50 UTC1h 20m
2026-07-18 SKW6394 BFL → PHX Jul 18, 19:23 UTCJul 18, 20:52 UTC1h 29m
2026-07-18 SKW6394 - Jul 18, 17:30 UTCJul 18, 18:35 UTC1h 5m
2026-07-18 SKW6431 GJT → PHX Jul 18, 14:40 UTCJul 18, 15:55 UTC1h 15m
2026-07-18 SKW6431 GJT → PHX Jul 18, 14:37 UTCJul 18, 15:51 UTC1h 14m
2026-07-18 SKW6318 - Jul 18, 05:05 UTCJul 18, 06:05 UTC1h 0m
2026-07-18 SKW6268 - Jul 18, 01:54 UTCJul 18, 03:20 UTC1h 26m

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 N825SK page for operator, model, and routing details .

Mode-S AB4508 frequently asked

What is Mode-S code AB4508?
AB4508 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N825SK.
Where is Mode-S AB4508 registered?
Mode-S code AB4508 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 AB4508 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 06:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB4508, octal 52642410, decimal 11,224,328.
What flights does AB4508 operate?
Mode-S AB4508 has broadcast 20 distinct callsigns, including SKW4991, SKW4810, SKW6394, SKW4813, SKW4811.