Apparatus

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sensors Mode-S transponder

A26801

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N254SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A26801
Octal
50464001
Decimal
10,643,457
Country
US
Tail
N254SY
Type
E75L
No current signal · last broadcast 1d ago
Flights observed
16
Distinct callsigns
6
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A26801.

Country allocation

The ICAO 24-bit address A26801 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 6 distinct

Callsign Airline Flights Last seen
SKW4539 SkyWest Airlines 5 2026-04-13
SKW4088 - 3 2026-04-13
SKW4568 - 2 2026-04-13
SKW4177 - 2 2026-04-12
SKW4121 - 2 2026-04-13
SKW3767 SkyWest Airlines 2 2026-04-13

Recent flights last 16

DateFlightRouteTakeoffLandingDuration
2026-04-13 SKW4121 - Apr 13, 23:15 UTCApr 13, 23:45 UTC30m
2026-04-13 SKW4121 - Apr 13, 21:35 UTCApr 13, 22:24 UTC49m
2026-04-13 SKW4539 LGA → OKC Apr 13, 19:45 UTCApr 13, 19:50 UTC5m
2026-04-13 SKW4539 LGA → OKC Apr 13, 17:15 UTCApr 13, 19:32 UTC2h 17m
2026-04-13 SKW4539 LGA → OKC Apr 13, 16:15 UTCApr 13, 16:30 UTC15m
2026-04-13 SKW4539 LGA → OKC Apr 13, 15:50 UTCApr 13, 16:30 UTC40m
2026-04-13 SKW4539 LGA → OKC Apr 13, 14:15 UTCApr 13, 16:15 UTC2h 0m
2026-04-13 SKW4088 - Apr 13, 12:20 UTCApr 13, 13:05 UTC45m
2026-04-13 SKW4088 - Apr 13, 11:55 UTCApr 13, 13:05 UTC1h 10m
2026-04-13 SKW4088 - Apr 13, 11:40 UTCApr 13, 12:15 UTC35m
2026-04-13 SKW4568 - Apr 13, 03:55 UTCApr 13, 04:25 UTC30m
2026-04-13 SKW4568 - Apr 13, 03:11 UTCApr 13, 04:24 UTC1h 13m
2026-04-13 SKW3767 DTW → ATW Apr 13, 00:20 UTCApr 13, 01:40 UTC1h 20m
2026-04-12 SKW3767 DTW → ATW Apr 12, 23:55 UTCApr 13, 01:40 UTC1h 45m
2026-04-12 SKW4177 - Apr 12, 19:05 UTCApr 12, 20:00 UTC55m
2026-04-12 SKW4177 - Apr 12, 17:15 UTCApr 12, 17:35 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 N254SY page for operator, model, and routing details .

Mode-S A26801 frequently asked

What is Mode-S code A26801?
A26801 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N254SY.
Where is Mode-S A26801 registered?
Mode-S code A26801 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 A26801 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A26801, octal 50464001, decimal 10,643,457.
What flights does A26801 operate?
Mode-S A26801 has broadcast 6 distinct callsigns, including SKW4539, SKW4088, SKW4568, SKW4177, SKW4121.