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sensors Mode-S transponder

A8233A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N623UX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A8233A
Octal
52021472
Decimal
11,019,066
Country
US
Tail
N623UX
Type
E75L
No current signal · last broadcast 2h ago
Flights observed
574
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A8233A.

Country allocation

The ICAO 24-bit address A8233A 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
SKW5728 - 9 2026-06-23
SKW4649 - 9 2026-07-02
SKW5427 - 8 2026-06-23
SKW5459 - 7 2026-07-02
SKW4796 - 7 2026-07-02
SKW5897 - 6 2026-07-07
SKW5849 - 6 2026-07-04
SKW5583 - 6 2026-07-12
SKW5523 SkyWest Airlines 6 2026-06-19
SKW5508 - 6 2026-07-13
SKW5445 - 6 2026-07-02
SKW5415 - 6 2026-07-07
SKW4671 - 6 2026-07-13
SKW6015 - 5 2026-07-02
SKW5863 - 5 2026-07-07
SKW5536 - 5 2026-07-11
SKW5419 SkyWest Airlines 5 2026-06-09
SKW5384 - 5 2026-07-04
SKW4774 SkyWest Airlines 5 2026-04-18
SKW4702 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW5527 DEN → YWG Jul 14, 00:25 UTCJul 14, 02:05 UTC1h 40m
2026-07-14 SKW5527 DEN → YWG Jul 14, 00:14 UTCJul 14, 02:05 UTC1h 51m
2026-07-13 SKW4702 BFL → DEN Jul 13, 21:00 UTCJul 13, 23:05 UTC2h 5m
2026-07-13 SKW4702 BFL → DEN Jul 13, 21:01 UTCJul 13, 23:03 UTC2h 2m
2026-07-13 SKW4671 SFO → BFL Jul 13, 19:05 UTCJul 13, 20:00 UTC55m
2026-07-13 SKW5519 - Jul 13, 16:45 UTCJul 13, 17:50 UTC1h 5m
2026-07-13 SKW5508 SFO → CLD Jul 13, 02:05 UTCJul 13, 03:25 UTC1h 20m
2026-07-12 SKW5583 - Jul 12, 23:00 UTCJul 13, 00:45 UTC1h 45m
2026-07-12 SKW5583 TUS → SFO Jul 12, 22:57 UTCJul 13, 00:42 UTC1h 45m
2026-07-12 SKW6023 SFO → TUS Jul 12, 19:55 UTCJul 12, 21:45 UTC1h 50m
2026-07-12 SKW6023 SFO → TUS Jul 12, 19:44 UTCJul 12, 21:41 UTC1h 57m
2026-07-12 SKW4733 - Jul 12, 17:10 UTCJul 12, 18:45 UTC1h 35m
2026-07-12 SKW4733 BOI → SFO Jul 12, 17:17 UTCJul 12, 18:43 UTC1h 26m
2026-07-12 SKW4765 DEN → BOI Jul 12, 14:04 UTCJul 12, 15:22 UTC1h 18m
2026-07-12 SKW4765 - Jul 12, 13:50 UTCJul 12, 15:20 UTC1h 30m
2026-07-12 SKW5545 - Jul 12, 10:20 UTCJul 12, 12:15 UTC1h 55m
2026-07-12 SKW5545 MSN → DEN Jul 12, 10:19 UTCJul 12, 12:10 UTC1h 51m
2026-07-11 SKW4805 DEN → MSN Jul 11, 20:00 UTCJul 11, 21:50 UTC1h 50m
2026-07-11 SKW4805 - Jul 11, 19:55 UTCJul 11, 21:50 UTC1h 55m
2026-07-11 SKW5536 - Jul 11, 16:15 UTCJul 11, 18:15 UTC2h 0m
2026-07-11 SKW5536 MKE → DEN Jul 11, 16:09 UTCJul 11, 18:12 UTC2h 3m
2026-07-11 SKW4785 - Jul 11, 04:25 UTCJul 11, 06:15 UTC1h 50m
2026-07-11 SKW4785 DEN → MKE Jul 11, 04:23 UTCJul 11, 06:16 UTC1h 53m
2026-07-11 SKW5418 - Jul 11, 01:30 UTCJul 11, 03:20 UTC1h 50m
2026-07-11 SKW5418 ICT → DEN Jul 11, 00:01 UTCJul 11, 03:09 UTC3h 8m
2026-07-10 SKW4782 DEN → ICT Jul 10, 21:55 UTCJul 10, 22:50 UTC55m
2026-07-10 SKW5492 FSD → DEN Jul 10, 18:30 UTCJul 10, 19:45 UTC1h 15m
2026-07-10 SKW4759 DEN → FSD Jul 10, 16:20 UTCJul 10, 17:30 UTC1h 10m
2026-07-10 SKW5822 - Jul 10, 13:10 UTCJul 10, 14:30 UTC1h 20m
2026-07-09 SKW5219 - Jul 9, 23:55 UTCJul 10, 01:15 UTC1h 20m
2026-07-09 SKW5219 DEN → MAF Jul 9, 23:58 UTCJul 10, 01:13 UTC1h 15m
2026-07-09 SKW4713 - Jul 9, 19:45 UTCJul 9, 22:20 UTC2h 35m
2026-07-09 SKW5241 - Jul 9, 17:40 UTCJul 9, 18:30 UTC50m
2026-07-09 SKW5241 LAX → MRY Jul 9, 17:46 UTCJul 9, 18:34 UTC48m
2026-07-09 SKW6053 - Jul 9, 14:20 UTCJul 9, 16:05 UTC1h 45m
2026-07-09 SKW6053 SUN → LAX Jul 9, 14:13 UTCJul 9, 15:57 UTC1h 44m
2026-07-09 SKW5986 - Jul 9, 02:10 UTCJul 9, 03:10 UTC1h 0m
2026-07-08 SKW5417 - Jul 8, 22:45 UTCJul 9, 00:50 UTC2h 5m
2026-07-08 SKW5417 MSO → SFO Jul 8, 22:35 UTCJul 9, 00:43 UTC2h 8m
2026-07-08 SKW5422 - Jul 8, 19:35 UTCJul 8, 21:15 UTC1h 40m
2026-07-08 SKW5970 - Jul 8, 16:40 UTCJul 8, 18:25 UTC1h 45m
2026-07-08 SKW5430 SFO → SLC Jul 8, 01:55 UTCJul 8, 03:20 UTC1h 25m
2026-07-08 SKW5430 SFO → SLC Jul 8, 02:03 UTCJul 8, 03:13 UTC1h 10m
2026-07-07 SKW5583 - Jul 7, 22:45 UTCJul 8, 00:35 UTC1h 50m
2026-07-07 SKW5583 TUS → SFO Jul 7, 22:42 UTCJul 8, 00:35 UTC1h 53m
2026-07-07 SKW6023 - Jul 7, 20:00 UTCJul 7, 21:50 UTC1h 50m
2026-07-07 SKW4715 SBA → SFO Jul 7, 17:40 UTCJul 7, 18:30 UTC50m
2026-07-07 SKW5460 - Jul 7, 15:35 UTCJul 7, 15:55 UTC20m
2026-07-07 SKW5460 LAX → SBA Jul 7, 15:42 UTCJul 7, 15:53 UTC11m
2026-07-07 SKW5897 - Jul 7, 13:15 UTCJul 7, 13:50 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 N623UX page for operator, model, and routing details .

Mode-S A8233A frequently asked

What is Mode-S code A8233A?
A8233A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N623UX.
Where is Mode-S A8233A registered?
Mode-S code A8233A 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 A8233A broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8233A, octal 52021472, decimal 11,019,066.
What flights does A8233A operate?
Mode-S A8233A has broadcast 20 distinct callsigns, including SKW5728, SKW4649, SKW5427, SKW5459, SKW4796.