Apparatus

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sensors Mode-S transponder

A831E5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N627SY · EMBRAER ERJ-170-100 · operated by SKYWEST AIRLINES INC

Hex
A831E5
Octal
52030745
Decimal
11,022,821
Country
US
Tail
N627SY
Type
E170
No current signal · last broadcast Jul 26, 17:30 UTC
Flights observed
687
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:30 UTC

Last known position

Most recent position reported by Mode-S A831E5.

Country allocation

The ICAO 24-bit address A831E5 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
SKW5697 - 13 2026-07-21
SKW5343 SkyWest Airlines 9 2026-07-22
SKW4767 SkyWest Airlines 9 2026-07-22
SKW6008 - 8 2026-07-20
SKW5408 - 8 2026-07-20
SKW5403 SkyWest Airlines 8 2026-06-10
SKW5381 - 8 2026-06-16
SKW4669 SkyWest Airlines 8 2026-06-10
SKW5781 SkyWest Airlines 7 2026-07-22
SKW5779 SkyWest Airlines 7 2026-07-25
SKW5607 SkyWest Airlines 7 2026-07-21
SKW5524 SkyWest Airlines 7 2026-06-11
SKW4687 - 7 2026-07-22
SKW5988 - 6 2026-07-02
SKW5972 - 6 2026-07-13
SKW5914 SkyWest Airlines 6 2026-07-24
SKW5780 - 6 2026-07-04
SKW5759 SkyWest Airlines 6 2026-07-20
SKW5744 SkyWest Airlines 6 2026-07-20
SKW5731 - 6 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5717 ABE → ORD Jul 26, 15:50 UTCJul 26, 17:25 UTC1h 35m
2026-07-26 SKW5325 SNA → SFO Jul 26, 13:55 UTCJul 26, 15:05 UTC1h 10m
2026-07-26 SKW5259 ICT → ORD Jul 26, 12:20 UTCJul 26, 12:55 UTC35m
2026-07-26 SKW376Z DEN → SHV Jul 26, 01:15 UTCJul 26, 02:55 UTC1h 40m
2026-07-25 SKW5358 BOI → SFO Jul 25, 20:50 UTCJul 26, 00:15 UTC3h 25m
2026-07-25 SKW5358 BOI → SFO Jul 25, 20:58 UTCJul 26, 00:09 UTC3h 11m
2026-07-25 SKW4800 CMH → ORD Jul 25, 16:00 UTCJul 25, 19:00 UTC3h 0m
2026-07-25 SKW5766 ASE → DEN Jul 25, 14:00 UTCJul 25, 14:20 UTC20m
2026-07-25 SKW5779 BZN → SFO Jul 25, 01:45 UTCJul 25, 02:10 UTC25m
2026-07-24 SKW5914 LNK → ORD Jul 24, 22:20 UTCJul 25, 00:05 UTC1h 45m
2026-07-24 SKW5914 LNK → ORD Jul 24, 22:23 UTCJul 24, 23:33 UTC1h 10m
2026-07-24 SKW5311 ORD → DCA Jul 24, 19:55 UTCJul 24, 21:10 UTC1h 15m
2026-07-24 SKW5594 PSC → SFO Jul 24, 16:45 UTCJul 24, 18:00 UTC1h 15m
2026-07-24 SKW5594 PSC → SFO Jul 24, 16:44 UTCJul 24, 17:56 UTC1h 12m
2026-07-24 SKW5443 BHM → ORD Jul 24, 14:15 UTCJul 24, 15:20 UTC1h 5m
2026-07-24 SKW5895 SGF → DEN Jul 24, 11:00 UTCJul 24, 12:35 UTC1h 35m
2026-07-24 SKW5687 OKC → IAH Jul 24, 03:40 UTCJul 24, 05:25 UTC1h 45m
2026-07-24 SKW5544 TUL → ORD Jul 24, 00:10 UTCJul 24, 02:20 UTC2h 10m
2026-07-24 SKW5544 TUL → ORD Jul 24, 00:13 UTCJul 24, 02:09 UTC1h 56m
2026-07-23 SKW4802 ONT → SFO Jul 23, 20:20 UTCJul 23, 22:05 UTC1h 45m
2026-07-23 SKW5276 DCA → ORD Jul 23, 17:42 UTCJul 23, 19:02 UTC1h 20m
2026-07-23 SKW5795 ORD → TUL Jul 23, 14:35 UTCJul 23, 15:55 UTC1h 20m
2026-07-23 SKW4707 STL → ORD Jul 23, 10:15 UTCJul 23, 10:50 UTC35m
2026-07-23 SKW4707 STL → ORD Jul 23, 10:19 UTCJul 23, 10:33 UTC14m
2026-07-23 SKW5214 STL → DEN Jul 23, 04:20 UTCJul 23, 06:10 UTC1h 50m
2026-07-23 SKW5214 STL → DEN Jul 23, 04:04 UTCJul 23, 06:02 UTC1h 58m
2026-07-23 SKW5418 SAV → ORD Jul 23, 01:50 UTCJul 23, 03:00 UTC1h 10m
2026-07-22 SKW4782 MSN → ORD Jul 22, 22:00 UTCJul 22, 23:00 UTC1h 0m
2026-07-22 SKW4767 HPN → ORD Jul 22, 19:30 UTCJul 22, 19:55 UTC25m
2026-07-22 SKW5343 SGF → IAH Jul 22, 17:39 UTCJul 22, 18:09 UTC30m
2026-07-22 SKW5343 SGF → IAH Jul 22, 17:35 UTCJul 22, 18:05 UTC30m
2026-07-22 SKW4687 - Jul 22, 14:50 UTCJul 22, 15:15 UTC25m
2026-07-22 SKW4687 ASE → DEN Jul 22, 14:58 UTCJul 22, 15:13 UTC15m
2026-07-22 SKW5781 DEN → ASE Jul 22, 03:05 UTCJul 22, 03:35 UTC30m
2026-07-22 SKW5781 DEN → ASE Jul 22, 02:58 UTCJul 22, 03:50 UTC52m
2026-07-21 SKW5697 DEN → DEN Jul 21, 22:45 UTCJul 21, 23:40 UTC55m
2026-07-21 SKW5697 DEN → DEN Jul 21, 22:40 UTCJul 21, 23:40 UTC1h 0m
2026-07-21 SKW5607 TVC → DEN Jul 21, 21:05 UTCJul 21, 21:30 UTC25m
2026-07-21 SKW4700 - Jul 21, 17:35 UTCJul 21, 19:10 UTC1h 35m
2026-07-21 SKW4741 DEN → AUS Jul 21, 13:40 UTCJul 21, 15:50 UTC2h 10m
2026-07-21 SKW5370 ORD → CVG Jul 21, 03:35 UTCJul 21, 05:15 UTC1h 40m
2026-07-21 SKW5718 - Jul 21, 01:25 UTCJul 21, 02:20 UTC55m
2026-07-20 SKW5548 - Jul 20, 23:20 UTCJul 21, 00:30 UTC1h 9m
2026-07-20 SKW5548 LAX → PHX Jul 20, 23:25 UTCJul 21, 00:26 UTC1h 1m
2026-07-20 SKW6008 SUN → LAX Jul 20, 20:10 UTCJul 20, 22:19 UTC2h 9m
2026-07-20 SKW6008 - Jul 20, 17:30 UTCJul 20, 22:25 UTC4h 55m
2026-07-20 SKW5408 - Jul 20, 14:15 UTCJul 20, 15:45 UTC1h 30m
2026-07-20 SKW5408 SLC → LAX Jul 20, 14:09 UTCJul 20, 15:40 UTC1h 31m
2026-07-20 SKW5744 LAX → SLC Jul 20, 04:35 UTCJul 20, 06:05 UTC1h 30m
2026-07-20 SKW5759 ONT → SFO Jul 20, 02:20 UTCJul 20, 03:05 UTC45m

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 N627SY page for operator, model, and routing details .

Mode-S A831E5 frequently asked

What is Mode-S code A831E5?
A831E5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N627SY.
Where is Mode-S A831E5 registered?
Mode-S code A831E5 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 A831E5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A831E5, octal 52030745, decimal 11,022,821.
What flights does A831E5 operate?
Mode-S A831E5 has broadcast 20 distinct callsigns, including SKW5697, SKW5343, SKW4767, SKW6008, SKW5408.