Apparatus

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sensors Mode-S transponder

A23CCB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A23CCB
Octal
50436313
Decimal
10,632,395
Country
US
Tail
N243SY
Type
E75L
No current signal · last broadcast Jul 26, 22:20 UTC
Flights observed
690
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:20 UTC

Last known position

Most recent position reported by Mode-S A23CCB.

Country allocation

The ICAO 24-bit address A23CCB 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
SKW3876 - 13 2026-07-22
SKW3669 SkyWest Airlines 13 2026-07-26
SKW3951 SkyWest Airlines 11 2026-06-07
SKW3991 SkyWest Airlines 10 2026-05-14
SKW4134 - 9 2026-06-19
SKW3903 - 9 2026-06-23
SKW107K - 9 2026-07-01
SKW3945 SkyWest Airlines 8 2026-07-22
SKW3772 - 8 2026-07-01
SKW3536 - 8 2026-07-19
SKW4068 SkyWest Airlines 7 2026-05-28
SKW4032 - 7 2026-07-16
SKW4016 SkyWest Airlines 7 2026-07-22
SKW3706 SkyWest Airlines 7 2026-07-21
SKW3561 - 7 2026-07-16
SKW4175 - 6 2026-07-06
SKW4146 - 6 2026-07-05
SKW4101 SkyWest Airlines 6 2026-07-26
SKW4063 - 6 2026-06-23
SKW4042 SkyWest Airlines 6 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3908 ATL → CRW Jul 26, 19:45 UTCJul 26, 22:20 UTC2h 35m
2026-07-26 SKW4101 SJC → SLC Jul 26, 15:55 UTCJul 26, 17:55 UTC2h 0m
2026-07-26 SKW4101 SJC → SLC Jul 26, 12:30 UTCJul 26, 14:50 UTC2h 20m
2026-07-26 SKW3669 DTW → YUL Jul 26, 02:00 UTCJul 26, 03:45 UTC1h 45m
2026-07-25 SKW3669 DTW → YUL Jul 25, 22:55 UTCJul 26, 00:55 UTC2h 0m
2026-07-25 SKW4085 CLE → BOS Jul 25, 17:40 UTCJul 25, 20:50 UTC3h 10m
2026-07-25 SKW4085 CLE → BOS Jul 25, 13:00 UTCJul 25, 16:05 UTC3h 5m
2026-07-25 SKW3669 DTW → YUL Jul 25, 01:45 UTCJul 25, 03:30 UTC1h 45m
2026-07-24 SKW3669 DTW → YUL Jul 24, 22:30 UTCJul 25, 00:15 UTC1h 45m
2026-07-24 SKW4028 SEA → SFO Jul 24, 18:10 UTCJul 24, 20:35 UTC2h 25m
2026-07-24 SKW4028 SEA → SFO Jul 24, 14:40 UTCJul 24, 17:05 UTC2h 25m
2026-07-24 SKW4088 JFK → BOS Jul 24, 12:00 UTCJul 24, 13:25 UTC1h 25m
2026-07-24 SKW3952 ATL → HPN Jul 24, 01:25 UTCJul 24, 02:45 UTC1h 20m
2026-07-23 SKW3767 DTW → ATW Jul 23, 21:35 UTCJul 23, 23:10 UTC1h 35m
2026-07-23 SKW3767 DTW → ATW Jul 23, 18:05 UTCJul 23, 19:50 UTC1h 45m
2026-07-23 SKW3650 FAR → MSP Jul 23, 15:15 UTCJul 23, 16:45 UTC1h 30m
2026-07-23 SKW3650 FAR → MSP Jul 23, 12:30 UTCJul 23, 14:10 UTC1h 40m
2026-07-23 SKW3669 DTW → YUL Jul 23, 05:55 UTCJul 23, 07:40 UTC1h 45m
2026-07-23 SKW3669 DTW → YUL Jul 23, 02:45 UTCJul 23, 04:55 UTC2h 10m
2026-07-22 SKW4016 ATL → CRW Jul 22, 21:10 UTCJul 22, 22:15 UTC1h 5m
2026-07-22 SKW141E AUS → MSY Jul 22, 19:10 UTCJul 22, 20:25 UTC1h 15m
2026-07-22 SKW3876 DEN → AUS Jul 22, 15:40 UTCJul 22, 17:30 UTC1h 50m
2026-07-22 SKW3876 AUS → DEN Jul 22, 12:40 UTCJul 22, 14:30 UTC1h 50m
2026-07-22 SKW3945 JFK → ORD Jul 22, 01:00 UTCJul 22, 02:40 UTC1h 40m
2026-07-22 SKW3945 JFK → ORD Jul 22, 01:08 UTCJul 22, 02:39 UTC1h 31m
2026-07-21 SKW3945 AUS → BNA Jul 21, 21:00 UTCJul 21, 22:50 UTC1h 50m
2026-07-21 SKW3945 JFK → ORD Jul 21, 20:50 UTCJul 21, 22:41 UTC1h 51m
2026-07-21 SKW3955 ATL → MGM Jul 21, 16:55 UTCJul 21, 19:30 UTC2h 35m
2026-07-21 SKW3874 OMA → SLC Jul 21, 13:30 UTCJul 21, 15:50 UTC2h 20m
2026-07-21 SKW3706 BNA → JFK Jul 21, 02:55 UTCJul 21, 04:50 UTC1h 55m
2026-07-21 SKW144J - Jul 21, 00:10 UTCJul 21, 01:40 UTC1h 30m
2026-07-20 SKW108R SLC → LGB Jul 20, 21:25 UTCJul 20, 22:55 UTC1h 30m
2026-07-20 SKW3815 DLH → MSP Jul 20, 17:50 UTCJul 20, 19:55 UTC2h 5m
2026-07-20 SKW3838 - Jul 20, 15:55 UTCJul 20, 16:55 UTC1h 0m
2026-07-20 SKW3844 MDW → MSP Jul 20, 12:55 UTCJul 20, 14:40 UTC1h 45m
2026-07-20 SKW3844 MDW → MSP Jul 20, 13:01 UTCJul 20, 14:40 UTC1h 39m
2026-07-19 SKW3791 MSP → OKC Jul 19, 23:45 UTCJul 20, 01:25 UTC1h 40m
2026-07-19 SKW3686 MSN → MSP Jul 19, 22:05 UTCJul 19, 22:35 UTC30m
2026-07-19 SKW3686 MSN → MSP Jul 19, 20:10 UTCJul 19, 20:30 UTC20m
2026-07-19 SKW3536 XNA → MSP Jul 19, 17:00 UTCJul 19, 18:40 UTC1h 40m
2026-07-19 SKW3536 MSP → XNA Jul 19, 14:50 UTCJul 19, 16:10 UTC1h 20m
2026-07-19 SKW3660 YWG → MSP Jul 19, 12:30 UTCJul 19, 13:30 UTC1h 0m
2026-07-19 SKW135K LAX → SJC Jul 19, 03:05 UTCJul 19, 04:10 UTC1h 5m
2026-07-18 SKW3935 - Jul 18, 22:55 UTCJul 18, 23:45 UTC50m
2026-07-18 SKW3935 - Jul 18, 20:40 UTCJul 18, 21:30 UTC50m
2026-07-18 SKW3989 - Jul 18, 17:30 UTCJul 18, 19:10 UTC1h 40m
2026-07-18 SKW3989 MEM → MSP Jul 18, 17:23 UTCJul 18, 19:05 UTC1h 42m
2026-07-18 SKW3989 - Jul 18, 14:25 UTCJul 18, 16:00 UTC1h 35m
2026-07-18 SKW3899 - Jul 18, 11:10 UTCJul 18, 12:50 UTC1h 40m
2026-07-18 SKW4035 - Jul 18, 01:25 UTCJul 18, 03:00 UTC1h 36m

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 N243SY page for operator, model, and routing details .

Mode-S A23CCB frequently asked

What is Mode-S code A23CCB?
A23CCB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243SY.
Where is Mode-S A23CCB registered?
Mode-S code A23CCB 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 A23CCB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23CCB, octal 50436313, decimal 10,632,395.
What flights does A23CCB operate?
Mode-S A23CCB has broadcast 20 distinct callsigns, including SKW3876, SKW3669, SKW3951, SKW3991, SKW4134.