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
Broadcasting now · callsign SKW4927 · 1,675 ft
Flights observed
548
Distinct callsigns
20
Country
US
Last broadcast
9m ago

Current position

AB4508 is currently broadcasting. Map zoomed to live position.

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 - 22 2026-07-10
SKW4813 - 19 2026-07-09
SKW6394 - 17 2026-07-09
SKW4821 - 17 2026-07-05
SKW4815 - 17 2026-06-26
SKW6235 - 16 2026-07-11
SKW4820 - 16 2026-06-26
SKW4811 - 16 2026-07-10
SKW6367 SkyWest Airlines 15 2026-05-19
SKW6248 SkyWest Airlines 14 2026-05-03
SKW4994 - 14 2026-07-07
SKW4817 - 14 2026-07-06
SKW4812 - 14 2026-07-10
SKW4922 - 13 2026-07-12
SKW6422 - 12 2026-07-11
SKW4927 - 12 2026-07-14
SKW6406 - 11 2026-07-11
SKW6257 SkyWest Airlines 11 2026-05-03
SKW4818 - 11 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW4927 - Jul 14, 04:55 UTCJul 14, 06:00 UTC1h 5m
2026-07-14 SKW4927 PHX → SBA Jul 14, 00:15 UTCJul 14, 01:20 UTC1h 5m
2026-07-13 SKW9917 - Jul 13, 21:35 UTCJul 13, 22:20 UTC45m
2026-07-13 SKW9917 PSP → PHX Jul 13, 21:03 UTCJul 13, 22:20 UTC1h 17m
2026-07-12 SKW4922 - Jul 12, 03:30 UTCJul 12, 04:01 UTC30m
2026-07-12 SKW4922 PHX → PSP Jul 12, 03:30 UTCJul 12, 04:10 UTC40m
2026-07-11 SKW6268 - Jul 11, 23:20 UTCJul 12, 01:00 UTC1h 40m
2026-07-11 SKW6268 - Jul 11, 21:05 UTCJul 11, 22:25 UTC1h 20m
2026-07-11 SKW6422 SLC → PHX Jul 11, 18:30 UTCJul 11, 19:45 UTC1h 15m
2026-07-11 SKW6422 SLC → PHX Jul 11, 18:31 UTCJul 11, 19:45 UTC1h 14m
2026-07-11 SKW6422 PHX → SLC Jul 11, 15:55 UTCJul 11, 17:10 UTC1h 15m
2026-07-11 SKW6406 - Jul 11, 13:45 UTCJul 11, 14:30 UTC45m
2026-07-11 SKW6406 PSP → PHX Jul 11, 13:39 UTCJul 11, 14:30 UTC51m
2026-07-11 SKW4922 - Jul 11, 03:30 UTCJul 11, 04:01 UTC30m
2026-07-11 SKW4922 PHX → PSP Jul 11, 03:27 UTCJul 11, 04:08 UTC41m
2026-07-11 SKW6235 - Jul 11, 00:05 UTCJul 11, 01:20 UTC1h 15m
2026-07-10 SKW6235 PHX → BFL Jul 10, 22:15 UTCJul 10, 23:20 UTC1h 5m
2026-07-10 SKW4812 - Jul 10, 20:40 UTCJul 10, 21:20 UTC40m
2026-07-10 SKW4811 - Jul 10, 18:50 UTCJul 10, 19:30 UTC40m
2026-07-10 SKW4811 PHX → SGU Jul 10, 18:54 UTCJul 10, 19:40 UTC46m
2026-07-10 SKW4810 - Jul 10, 14:00 UTCJul 10, 14:45 UTC45m
2026-07-10 SKW4810 SGU → PHX Jul 10, 13:55 UTCJul 10, 14:44 UTC49m
2026-07-09 SKW4813 - Jul 9, 21:50 UTCJul 9, 22:25 UTC35m
2026-07-09 SKW6394 BFL → PHX Jul 9, 19:20 UTCJul 9, 20:30 UTC1h 10m
2026-07-09 SKW6394 PHX → BFL Jul 9, 17:25 UTCJul 9, 18:30 UTC1h 5m
2026-07-09 SKW6431 - Jul 9, 15:15 UTCJul 9, 16:15 UTC1h 0m
2026-07-09 SKW6318 - Jul 9, 05:10 UTCJul 9, 06:00 UTC50m
2026-07-09 SKW4944 - Jul 9, 01:55 UTCJul 9, 03:00 UTC1h 5m
2026-07-09 SKW4944 PHX → BUR Jul 9, 00:05 UTCJul 9, 01:05 UTC1h 0m
2026-07-08 SKW6373 TUS → PHX Jul 8, 22:16 UTCJul 8, 22:41 UTC25m
2026-07-08 SKW6373 PHX → TUS Jul 8, 21:00 UTCJul 8, 21:30 UTC30m
2026-07-08 SKW4978 PHX → PHX Jul 8, 16:10 UTCJul 8, 19:00 UTC2h 50m
2026-07-08 SKW4889 - Jul 8, 11:40 UTCJul 8, 13:05 UTC1h 25m
2026-07-08 SKW5009 - Jul 8, 02:30 UTCJul 8, 03:50 UTC1h 20m
2026-07-07 SKW6276 OKC → PHX Jul 7, 23:25 UTCJul 8, 01:20 UTC1h 55m
2026-07-07 SKW6276 PHX → OKC Jul 7, 20:30 UTCJul 7, 22:35 UTC2h 5m
2026-07-07 SKW4812 - Jul 7, 18:45 UTCJul 7, 19:30 UTC45m
2026-07-07 SKW4812 SGU → PHX Jul 7, 18:22 UTCJul 7, 19:25 UTC1h 3m
2026-07-07 SKW4811 - Jul 7, 16:10 UTCJul 7, 16:45 UTC35m
2026-07-07 SKW6406 - Jul 7, 14:00 UTCJul 7, 14:40 UTC40m
2026-07-07 SKW4922 - Jul 7, 04:00 UTCJul 7, 04:30 UTC30m
2026-07-07 SKW4994 - Jul 7, 01:35 UTCJul 7, 02:45 UTC1h 10m
2026-07-06 SKW4994 - Jul 6, 23:10 UTCJul 7, 00:10 UTC1h 0m
2026-07-06 SKW4991 - Jul 6, 19:35 UTCJul 6, 21:55 UTC2h 20m
2026-07-06 SKW4991 - Jul 6, 16:00 UTCJul 6, 18:15 UTC2h 15m
2026-07-06 SKW4810 - Jul 6, 14:05 UTCJul 6, 14:45 UTC40m
2026-07-06 SKW4810 SGU → PHX Jul 6, 13:56 UTCJul 6, 14:44 UTC48m
2026-07-06 SKW4817 - Jul 6, 02:35 UTCJul 6, 04:50 UTC2h 15m
2026-07-05 SKW4821 - Jul 5, 23:45 UTCJul 6, 01:05 UTC1h 20m
2026-07-05 SKW4821 - Jul 5, 21:30 UTCJul 5, 22:40 UTC1h 10m

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?
Yes. Mode-S AB4508 is currently airborne.
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, SKW4813, SKW6394, SKW4821.