Apparatus

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sensors Mode-S transponder

A81F83

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N622UX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A81F83
Octal
52017603
Decimal
11,018,115
Country
US
Tail
N622UX
Type
E75L
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
707
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A81F83.

Country allocation

The ICAO 24-bit address A81F83 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
SKW5523 - 8 2026-07-11
SKW5923 - 7 2026-07-06
SKW5460 - 7 2026-07-17
SKW5443 SkyWest Airlines 7 2026-05-08
SKW5417 - 7 2026-07-12
SKW5256 SkyWest Airlines 7 2026-06-13
SKW4796 - 7 2026-07-17
SKW4715 - 7 2026-07-17
SKW5702 SkyWest Airlines 6 2026-06-14
SKW5438 - 6 2026-07-11
SKW5248 - 6 2026-07-06
SKW4753 SkyWest Airlines 6 2026-07-25
SKW4649 - 6 2026-07-17
SKW5899 SkyWest Airlines 5 2026-06-01
SKW5857 SkyWest Airlines 5 2026-07-02
SKW5797 - 5 2026-07-01
SKW5704 SkyWest Airlines 5 2026-06-13
SKW5658 SkyWest Airlines 5 2026-05-13
SKW5656 - 5 2026-06-21
SKW5644 SkyWest Airlines 5 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW386E LAX → ACV Jul 26, 19:55 UTCJul 26, 21:00 UTC1h 5m
2026-07-26 SKW5384 ORD → TUL Jul 26, 18:10 UTCJul 26, 18:35 UTC25m
2026-07-26 SKW4643 CHA → ORD Jul 26, 16:10 UTCJul 26, 16:40 UTC30m
2026-07-26 SKW4643 CHA → ORD Jul 26, 16:05 UTCJul 26, 16:36 UTC31m
2026-07-26 SKW4642 BIS → DEN Jul 26, 11:10 UTCJul 26, 13:40 UTC2h 30m
2026-07-26 SKW384A LAX → AUS Jul 26, 02:20 UTCJul 26, 05:10 UTC2h 50m
2026-07-26 SKW384A LAX → AUS Jul 26, 02:14 UTCJul 26, 05:06 UTC2h 52m
2026-07-26 SKW5685 YUL → ORD Jul 26, 00:15 UTCJul 26, 01:20 UTC1h 5m
2026-07-25 SKW5424 DEN → TUS Jul 25, 22:15 UTCJul 25, 23:10 UTC55m
2026-07-25 SKW514P SMF → LAX Jul 25, 17:30 UTCJul 25, 18:40 UTC1h 10m
2026-07-25 SKW5220 YYZ → DEN Jul 25, 15:30 UTCJul 25, 15:55 UTC25m
2026-07-25 SKW5220 YYZ → DEN Jul 25, 15:36 UTCJul 25, 15:49 UTC13m
2026-07-25 SKW5676 SFO → GEG Jul 25, 12:18 UTCJul 25, 14:09 UTC1h 51m
2026-07-25 SKW5676 SFO → GEG Jul 25, 12:05 UTCJul 25, 14:20 UTC2h 15m
2026-07-25 SKW5579 RDD → LAX Jul 25, 07:12 UTCJul 25, 08:23 UTC1h 11m
2026-07-25 SKW5579 RDD → LAX Jul 25, 07:00 UTCJul 25, 08:30 UTC1h 30m
2026-07-25 SKW6042 IAH → ABQ Jul 25, 03:55 UTCJul 25, 06:10 UTC2h 15m
2026-07-25 SKW6042 IAH → ABQ Jul 25, 03:29 UTCJul 25, 06:06 UTC2h 37m
2026-07-25 SKW4753 BOI → SFO Jul 25, 00:31 UTCJul 25, 01:52 UTC1h 21m
2026-07-25 SKW4753 BOI → SFO Jul 25, 00:25 UTCJul 25, 02:00 UTC1h 35m
2026-07-24 SKW5599 MKE → IAH Jul 24, 22:28 UTCJul 24, 23:27 UTC59m
2026-07-24 SKW5599 MKE → IAH Jul 24, 22:30 UTCJul 24, 23:30 UTC1h 0m
2026-07-24 SKW5507 GSO → DEN Jul 24, 19:10 UTCJul 24, 21:05 UTC1h 55m
2026-07-24 SKW5536 SFO → TUS Jul 24, 16:00 UTCJul 24, 18:15 UTC2h 15m
2026-07-24 SKW4785 IAH → LGA Jul 24, 03:20 UTCJul 24, 05:10 UTC1h 50m
2026-07-24 SKW4785 IAH → LGA Jul 24, 03:10 UTCJul 24, 05:07 UTC1h 57m
2026-07-24 SKW5273 OKC → ORD Jul 24, 00:25 UTCJul 24, 02:15 UTC1h 50m
2026-07-24 SKW5273 OKC → ORD Jul 24, 00:23 UTCJul 24, 02:14 UTC1h 51m
2026-07-23 SKW5677 SLC → ORD Jul 23, 20:50 UTCJul 23, 22:15 UTC1h 25m
2026-07-23 SKW5834 ABQ → DEN Jul 23, 18:30 UTCJul 23, 19:25 UTC55m
2026-07-23 SKW5487 ORD → MEM Jul 23, 16:30 UTCJul 23, 17:25 UTC55m
2026-07-23 SKW4777 ORD → BNA Jul 23, 11:10 UTCJul 23, 12:45 UTC1h 35m
2026-07-23 SKW4777 ORD → BNA Jul 23, 11:11 UTCJul 23, 12:38 UTC1h 27m
2026-07-23 SKW5389 SAN → SFO Jul 23, 05:40 UTCJul 23, 07:00 UTC1h 20m
2026-07-23 SKW5389 SAN → SFO Jul 23, 05:44 UTCJul 23, 06:53 UTC1h 9m
2026-07-23 SKW5273 OKC → ORD Jul 23, 02:00 UTCJul 23, 04:10 UTC2h 10m
2026-07-22 SKW5677 SLC → ORD Jul 22, 20:45 UTCJul 22, 22:15 UTC1h 30m
2026-07-22 SKW5536 SFO → TUS Jul 22, 16:15 UTCJul 22, 18:30 UTC2h 15m
2026-07-21 SKW4802 DEN → MKE Jul 21, 19:50 UTCJul 21, 21:40 UTC1h 50m
2026-07-21 SKW4802 DEN → MKE Jul 21, 19:50 UTCJul 21, 21:39 UTC1h 49m
2026-07-21 SKW5400 ORD → GRR Jul 21, 16:43 UTCJul 21, 16:57 UTC14m
2026-07-21 SKW5400 ORD → GRR Jul 21, 16:40 UTCJul 21, 17:00 UTC20m
2026-07-21 SKW4793 LAX → RDD Jul 21, 01:20 UTCJul 21, 01:40 UTC20m
2026-07-20 SKW5404 SGF → ORD Jul 20, 22:30 UTCJul 21, 00:00 UTC1h 30m
2026-07-20 SKW4693 LAX → RDM Jul 20, 19:40 UTCJul 20, 21:05 UTC1h 25m
2026-07-20 SKW5903 SUN → SFO Jul 20, 16:35 UTCJul 20, 18:05 UTC1h 30m
2026-07-20 SKW5468 SFO → SAT Jul 20, 14:05 UTCJul 20, 15:35 UTC1h 30m
2026-07-20 SKW5468 SFO → SAT Jul 20, 14:01 UTCJul 20, 15:27 UTC1h 26m
2026-07-20 SKW4641 ORD → FNT Jul 20, 11:30 UTCJul 20, 12:15 UTC45m
2026-07-20 SKW486V DEN → IDA Jul 20, 03:40 UTCJul 20, 04:00 UTC20m

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 N622UX page for operator, model, and routing details .

Mode-S A81F83 frequently asked

What is Mode-S code A81F83?
A81F83 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N622UX.
Where is Mode-S A81F83 registered?
Mode-S code A81F83 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 A81F83 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81F83, octal 52017603, decimal 11,018,115.
What flights does A81F83 operate?
Mode-S A81F83 has broadcast 20 distinct callsigns, including SKW5523, SKW5923, SKW5460, SKW5443, SKW5417.