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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 Jul 26, 21:50 UTC
Flights observed
679
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

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
SKW4702 SkyWest Airlines 10 2026-07-23
SKW4671 SkyWest Airlines 10 2026-07-22
SKW5728 - 9 2026-06-23
SKW4649 - 9 2026-07-02
SKW5427 - 8 2026-06-23
SKW5897 - 7 2026-07-21
SKW5863 SkyWest Airlines 7 2026-07-21
SKW5849 SkyWest Airlines 7 2026-07-25
SKW5583 - 7 2026-07-21
SKW5523 SkyWest Airlines 7 2026-07-16
SKW5459 - 7 2026-07-02
SKW5415 SkyWest Airlines 7 2026-07-21
SKW4796 - 7 2026-07-02
SKW5508 - 6 2026-07-13
SKW5458 SkyWest Airlines 6 2026-07-25
SKW5456 SkyWest Airlines 6 2026-07-20
SKW5445 - 6 2026-07-02
SKW6023 SkyWest Airlines 5 2026-07-21
SKW6015 - 5 2026-07-02
SKW5908 - 5 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5548 COS → DEN Jul 26, 20:35 UTCJul 26, 21:45 UTC1h 10m
2026-07-26 SKW514P SMF → LAX Jul 26, 17:25 UTCJul 26, 18:35 UTC1h 10m
2026-07-26 SKW5220 YYZ → DEN Jul 26, 15:58 UTCJul 26, 16:17 UTC19m
2026-07-26 SKW5220 YYZ → DEN Jul 26, 15:55 UTCJul 26, 16:20 UTC25m
2026-07-26 SKW5627 SFO → RNO Jul 26, 13:35 UTCJul 26, 14:30 UTC55m
2026-07-26 SKW5627 SFO → RNO Jul 26, 13:20 UTCJul 26, 14:22 UTC1h 2m
2026-07-26 SKW5983 SFO → SUN Jul 26, 04:38 UTCJul 26, 05:02 UTC24m
2026-07-26 SKW5983 SFO → SUN Jul 26, 04:30 UTCJul 26, 05:05 UTC35m
2026-07-26 SKW5305 CMH → IAH Jul 26, 02:30 UTCJul 26, 03:15 UTC45m
2026-07-26 SKW5305 CMH → IAH Jul 26, 01:56 UTCJul 26, 03:09 UTC1h 13m
2026-07-25 SKW5567 ORD → MBS Jul 25, 21:00 UTCJul 25, 21:35 UTC35m
2026-07-25 SKW5567 ORD → MBS Jul 25, 21:03 UTCJul 25, 21:38 UTC35m
2026-07-25 SKW5248 MFR → SFO Jul 25, 19:04 UTCJul 25, 19:53 UTC49m
2026-07-25 SKW5248 MFR → SFO Jul 25, 19:20 UTCJul 25, 20:00 UTC40m
2026-07-25 SKW5372 BUR → SFO Jul 25, 16:40 UTCJul 25, 17:40 UTC1h 0m
2026-07-25 SKW5372 BUR → SFO Jul 25, 16:40 UTCJul 25, 17:40 UTC1h 0m
2026-07-25 SKW5849 SFO → SUN Jul 25, 13:25 UTCJul 25, 14:20 UTC55m
2026-07-25 SKW5458 RDM → SFO Jul 25, 04:55 UTCJul 25, 05:55 UTC1h 0m
2026-07-25 SKW5458 RDM → SFO Jul 25, 04:43 UTCJul 25, 05:56 UTC1h 13m
2026-07-25 SKW4722 SMF → SFO Jul 25, 02:00 UTCJul 25, 02:55 UTC55m
2026-07-25 SKW4722 SMF → SFO Jul 25, 02:08 UTCJul 25, 02:54 UTC46m
2026-07-24 SKW5457 IAH → DFW Jul 24, 23:45 UTCJul 25, 00:50 UTC1h 5m
2026-07-24 SKW5307 ASE → SFO Jul 24, 21:20 UTCJul 24, 22:00 UTC40m
2026-07-24 SKW5307 ASE → SFO Jul 24, 21:15 UTCJul 24, 21:56 UTC41m
2026-07-24 SKW5655 BUR → SFO Jul 24, 18:00 UTCJul 24, 19:55 UTC1h 55m
2026-07-24 SKW4692 MLI → DEN Jul 24, 14:25 UTCJul 24, 16:20 UTC1h 55m
2026-07-24 SKW5512 ASE → SFO Jul 24, 00:55 UTCJul 24, 02:25 UTC1h 30m
2026-07-23 SKW5749 PIT → ORD Jul 23, 23:15 UTCJul 23, 23:35 UTC20m
2026-07-23 SKW342F DEN → GUC Jul 23, 20:25 UTCJul 23, 20:50 UTC25m
2026-07-23 SKW6007 ORD → DCA Jul 23, 17:40 UTCJul 23, 18:55 UTC1h 15m
2026-07-23 SKW5476 AUS → LAX Jul 23, 15:20 UTCJul 23, 16:35 UTC1h 15m
2026-07-23 SKW5895 SGF → DEN Jul 23, 11:00 UTCJul 23, 12:40 UTC1h 40m
2026-07-23 SKW5687 OKC → IAH Jul 23, 04:20 UTCJul 23, 05:40 UTC1h 20m
2026-07-23 SKW4702 BFL → DEN Jul 23, 00:10 UTCJul 23, 00:40 UTC30m
2026-07-23 SKW4702 BFL → DEN Jul 23, 00:01 UTCJul 23, 00:35 UTC34m
2026-07-22 SKW4702 BFL → DEN Jul 22, 19:55 UTCJul 22, 22:35 UTC2h 40m
2026-07-22 SKW4671 BFL → SFO Jul 22, 17:50 UTCJul 22, 18:35 UTC45m
2026-07-22 SKW4671 BFL → SFO Jul 22, 17:54 UTCJul 22, 18:33 UTC39m
2026-07-22 SKW5423 SFO → PHX Jul 22, 15:00 UTCJul 22, 16:25 UTC1h 25m
2026-07-22 SKW5423 SFO → PHX Jul 22, 14:37 UTCJul 22, 16:12 UTC1h 35m
2026-07-22 SKW5986 SLC → SFO Jul 22, 02:10 UTCJul 22, 03:20 UTC1h 10m
2026-07-22 SKW5986 SLC → SFO Jul 22, 02:18 UTCJul 22, 03:29 UTC1h 11m
2026-07-21 SKW5583 - Jul 21, 22:50 UTCJul 22, 00:45 UTC1h 55m
2026-07-21 SKW6023 SBN → ORD Jul 21, 19:55 UTCJul 21, 21:45 UTC1h 50m
2026-07-21 SKW4715 SFO → SLC Jul 21, 17:29 UTCJul 21, 18:04 UTC35m
2026-07-21 SKW4715 SFO → SLC Jul 21, 17:25 UTCJul 21, 18:15 UTC50m
2026-07-21 SKW5460 - Jul 21, 15:35 UTCJul 21, 16:00 UTC25m
2026-07-21 SKW5897 - Jul 21, 13:10 UTCJul 21, 13:50 UTC40m
2026-07-21 SKW5863 SNA → SFO Jul 21, 06:10 UTCJul 21, 06:45 UTC35m
2026-07-21 SKW5863 SNA → SFO Jul 21, 05:59 UTCJul 21, 06:41 UTC42m

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 Jul 26, 21:50 UTC.
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 SKW4702, SKW4671, SKW5728, SKW4649, SKW5427.