Apparatus

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sensors Mode-S transponder

A28BC9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N263SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A28BC9
Octal
50505711
Decimal
10,652,617
Country
US
Tail
N263SY
Type
E75L
Broadcasting now · 3,450 ft
Flights observed
671
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A28BC9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A28BC9 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
SKW3716 SkyWest Airlines 21 2026-07-24
SKW3805 SkyWest Airlines 15 2026-07-19
SKW3760 SkyWest Airlines 14 2026-07-20
SKW3910 SkyWest Airlines 13 2026-06-04
SKW3737 SkyWest Airlines 13 2026-07-21
SKW3690 SkyWest Airlines 13 2026-07-16
SKW4097 SkyWest Airlines 12 2026-07-26
SKW4078 SkyWest Airlines 12 2026-05-07
SKW4033 SkyWest Airlines 12 2026-07-26
SKW3758 SkyWest Airlines 12 2026-07-26
SKW3718 SkyWest Airlines 12 2026-07-23
SKW4091 SkyWest Airlines 11 2026-06-13
SKW4011 - 11 2026-07-21
SKW3929 - 11 2026-06-26
SKW3704 SkyWest Airlines 11 2026-07-25
SKW4179 SkyWest Airlines 10 2026-05-07
SKW4133 - 10 2026-07-21
SKW3776 SkyWest Airlines 10 2026-07-21
SKW3502 - 10 2026-07-24
SKW3778 SkyWest Airlines 9 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4033 HPN → ATL Jul 26, 21:30 UTCJul 26, 22:15 UTC45m
2026-07-26 SKW4033 HPN → ATL Jul 26, 18:35 UTCJul 26, 20:05 UTC1h 30m
2026-07-26 SKW4097 CMH → MSP Jul 26, 16:05 UTCJul 26, 17:30 UTC1h 25m
2026-07-26 SKW4097 CMH → MSP Jul 26, 13:20 UTCJul 26, 14:50 UTC1h 30m
2026-07-26 SKW3758 ATL → CRW Jul 26, 10:25 UTCJul 26, 11:30 UTC1h 5m
2026-07-26 SKW3758 ATL → CRW Jul 26, 10:13 UTCJul 26, 11:30 UTC1h 17m
2026-07-26 SKW3939 ABY → ATL Jul 26, 02:00 UTCJul 26, 03:00 UTC1h 0m
2026-07-26 SKW3939 ABY → ATL Jul 26, 01:19 UTCJul 26, 03:04 UTC1h 45m
2026-07-25 SKW3924 DTW → MSN Jul 25, 17:10 UTCJul 25, 20:15 UTC3h 5m
2026-07-25 SKW3704 GFK → MSP Jul 25, 00:20 UTCJul 25, 01:45 UTC1h 25m
2026-07-25 SKW3704 GFK → MSP Jul 25, 00:23 UTCJul 25, 02:00 UTC1h 37m
2026-07-24 SKW3842 MSP → RAP Jul 24, 22:05 UTCJul 24, 23:05 UTC1h 0m
2026-07-24 SKW3842 MSP → RAP Jul 24, 20:10 UTCJul 24, 20:55 UTC45m
2026-07-24 SKW3716 ATL → AGS Jul 24, 18:16 UTCJul 24, 18:41 UTC25m
2026-07-24 SKW3716 ATL → AGS Jul 24, 18:20 UTCJul 24, 18:45 UTC25m
2026-07-24 SKW3716 ATL → AGS Jul 24, 16:45 UTCJul 24, 17:15 UTC30m
2026-07-24 SKW3502 - Jul 24, 13:35 UTCJul 24, 14:40 UTC1h 5m
2026-07-24 SKW3846 LAX → TUS Jul 24, 02:30 UTCJul 24, 03:45 UTC1h 15m
2026-07-24 SKW3778 MOT → MSP Jul 24, 00:00 UTCJul 24, 01:05 UTC1h 5m
2026-07-23 SKW3717 ORD → BOS Jul 23, 21:10 UTCJul 23, 22:50 UTC1h 40m
2026-07-23 SKW3718 BNA → JFK Jul 23, 18:20 UTCJul 23, 19:45 UTC1h 25m
2026-07-23 SKW3718 BNA → JFK Jul 23, 18:24 UTCJul 23, 19:42 UTC1h 18m
2026-07-23 SKW3718 BNA → JFK Jul 23, 15:35 UTCJul 23, 17:00 UTC1h 25m
2026-07-23 SKW4037 SUN → SLC Jul 23, 13:35 UTCJul 23, 14:00 UTC25m
2026-07-23 SKW3985 CLE → BOS Jul 23, 03:10 UTCJul 23, 03:40 UTC30m
2026-07-23 SKW148E ATL → HPN Jul 23, 00:44 UTCJul 23, 01:51 UTC1h 7m
2026-07-22 SKW166C SEA → SJC Jul 22, 22:20 UTCJul 22, 22:55 UTC35m
2026-07-22 SKW4134 OAK → SLC Jul 22, 19:50 UTCJul 22, 21:20 UTC1h 30m
2026-07-22 SKW4134 OAK → SLC Jul 22, 19:48 UTCJul 22, 21:14 UTC1h 26m
2026-07-22 SKW4134 OAK → SLC Jul 22, 16:55 UTCJul 22, 18:20 UTC1h 25m
2026-07-22 SKW4152 MEM → LGA Jul 22, 14:05 UTCJul 22, 15:20 UTC1h 15m
2026-07-22 SKW3729 SLC → ABQ Jul 22, 03:50 UTCJul 22, 05:10 UTC1h 20m
2026-07-21 SKW3737 DTW → MDW Jul 21, 23:55 UTCJul 22, 01:20 UTC1h 25m
2026-07-21 SKW3776 SJC → SEA Jul 21, 22:00 UTCJul 21, 23:10 UTC1h 10m
2026-07-21 SKW4133 - Jul 21, 19:15 UTCJul 21, 20:55 UTC1h 40m
2026-07-21 SKW4011 - Jul 21, 14:05 UTCJul 21, 16:50 UTC2h 45m
2026-07-21 SKW3758 - Jul 21, 10:25 UTCJul 21, 11:25 UTC1h 0m
2026-07-21 SKW3939 ABY → ATL Jul 21, 01:05 UTCJul 21, 02:05 UTC1h 0m
2026-07-20 SKW4033 - Jul 20, 21:20 UTCJul 20, 22:40 UTC1h 20m
2026-07-20 SKW4033 - Jul 20, 18:40 UTCJul 20, 20:05 UTC1h 25m
2026-07-20 SKW3760 MSN → MSP Jul 20, 16:25 UTCJul 20, 17:25 UTC1h 0m
2026-07-20 SKW3760 MSN → MSP Jul 20, 13:55 UTCJul 20, 14:55 UTC1h 0m
2026-07-20 SKW3504 - Jul 20, 11:10 UTCJul 20, 12:40 UTC1h 30m
2026-07-20 SKW3505 DTW → OMA Jul 20, 00:10 UTCJul 20, 01:30 UTC1h 20m
2026-07-19 SKW3805 MDT → ATL Jul 19, 21:50 UTCJul 19, 22:50 UTC1h 0m
2026-07-19 SKW3805 MDT → ATL Jul 19, 19:50 UTCJul 19, 20:50 UTC1h 0m
2026-07-19 SKW4097 - Jul 19, 16:10 UTCJul 19, 17:35 UTC1h 25m
2026-07-19 SKW4097 - Jul 19, 13:25 UTCJul 19, 14:55 UTC1h 30m
2026-07-19 SKW3758 - Jul 19, 10:25 UTCJul 19, 11:25 UTC1h 0m
2026-07-19 SKW3758 OAJ → ATL Jul 19, 10:12 UTCJul 19, 11:21 UTC1h 9m

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 N263SY page for operator, model, and routing details .

Mode-S A28BC9 frequently asked

What is Mode-S code A28BC9?
A28BC9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N263SY.
Where is Mode-S A28BC9 registered?
Mode-S code A28BC9 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 A28BC9 broadcasting right now?
Yes. Mode-S A28BC9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A28BC9, octal 50505711, decimal 10,652,617.
What flights does A28BC9 operate?
Mode-S A28BC9 has broadcast 20 distinct callsigns, including SKW3716, SKW3805, SKW3760, SKW3910, SKW3737.