Apparatus

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sensors Mode-S transponder

A37B1C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N323SY · operated by SKYWEST AIRLINES INC

Hex
A37B1C
Octal
50675434
Decimal
10,713,884
Country
US
Tail
N323SY
Type
E75L
Broadcasting now · callsign SKW4070 · 1,050 ft
Flights observed
679
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

A37B1C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A37B1C 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
SKW3699 - 18 2026-07-17
SKW3989 - 12 2026-07-13
SKW3561 - 11 2026-07-19
SKW3536 - 11 2026-07-07
SKW182J - 11 2026-07-16
SKW4170 SkyWest Airlines 10 2026-05-03
SKW3806 SkyWest Airlines 9 2026-07-20
SKW4063 - 8 2026-07-08
SKW4005 - 8 2026-07-16
SKW3914 - 8 2026-07-17
SKW3822 SkyWest Airlines 8 2026-05-27
SKW3817 SkyWest Airlines 8 2026-05-25
SKW3686 - 8 2026-07-13
SKW4462 - 7 2026-07-15
SKW3951 SkyWest Airlines 7 2026-05-26
SKW3851 - 7 2026-06-19
SKW3834 - 7 2026-07-17
SKW3828 - 7 2026-07-01
SKW3750 SkyWest Airlines 7 2026-07-22
SKW3732 SkyWest Airlines 7 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4070 MSP → MSN Jul 26, 19:15 UTCJul 26, 21:20 UTC2h 5m
2026-07-26 SKW4070 MSP → MSN Jul 26, 16:00 UTCJul 26, 18:20 UTC2h 20m
2026-07-26 SKW4128 EUG → SEA Jul 26, 13:35 UTCJul 26, 14:20 UTC45m
2026-07-26 SKW3855 MSP → CID Jul 26, 05:15 UTCJul 26, 06:10 UTC55m
2026-07-26 SKW3999 MSN → DTW Jul 26, 00:50 UTCJul 26, 03:05 UTC2h 15m
2026-07-25 SKW3999 MSN → DTW Jul 25, 21:30 UTCJul 26, 00:05 UTC2h 35m
2026-07-25 SKW3824 BMI → ATL Jul 25, 18:45 UTCJul 25, 19:35 UTC50m
2026-07-25 SKW3824 BMI → ATL Jul 25, 16:50 UTCJul 25, 17:35 UTC45m
2026-07-25 SKW3790 RIC → DTW Jul 25, 14:10 UTCJul 25, 15:00 UTC50m
2026-07-25 SKW3576 LAX → GEG Jul 25, 05:25 UTCJul 25, 07:25 UTC2h 0m
2026-07-25 SKW4087 SAN → LAX Jul 25, 03:15 UTCJul 25, 03:40 UTC25m
2026-07-25 SKW4087 SAN → LAX Jul 25, 01:40 UTCJul 25, 02:15 UTC35m
2026-07-24 SKW3894 PHX → LAX Jul 24, 23:30 UTCJul 25, 00:25 UTC55m
2026-07-24 SKW3894 PHX → LAX Jul 24, 20:55 UTCJul 24, 22:00 UTC1h 5m
2026-07-24 SKW3755 LAX → SMF Jul 24, 18:30 UTCJul 24, 19:30 UTC1h 0m
2026-07-24 SKW3755 LAX → SMF Jul 24, 18:31 UTCJul 24, 19:29 UTC58m
2026-07-24 SKW3755 LAX → SMF Jul 24, 16:25 UTCJul 24, 17:20 UTC55m
2026-07-24 SKW3725 SBN → ATL Jul 24, 13:25 UTCJul 24, 15:15 UTC1h 50m
2026-07-24 SKW4148 LAX → BOI Jul 24, 04:05 UTCJul 24, 05:40 UTC1h 35m
2026-07-23 SKW3902 DTW → ALB Jul 23, 22:30 UTCJul 23, 23:45 UTC1h 15m
2026-07-23 SKW3902 DTW → ALB Jul 23, 22:30 UTCJul 23, 23:39 UTC1h 9m
2026-07-23 SKW3902 DTW → ALB Jul 23, 20:05 UTCJul 23, 21:00 UTC55m
2026-07-23 SKW4099 SJC → LAX Jul 23, 17:55 UTCJul 23, 19:00 UTC1h 5m
2026-07-23 SKW4099 SJC → LAX Jul 23, 15:30 UTCJul 23, 16:20 UTC50m
2026-07-23 SKW3743 SEA → SFO Jul 23, 13:35 UTCJul 23, 14:00 UTC25m
2026-07-23 SKW3746 LAX → SAN Jul 23, 06:05 UTCJul 23, 06:30 UTC25m
2026-07-23 SKW3883 MSP → MDW Jul 23, 03:45 UTCJul 23, 04:40 UTC55m
2026-07-23 SKW3883 MSP → MDW Jul 23, 01:40 UTCJul 23, 02:30 UTC50m
2026-07-22 SKW3701 BOS → CLE Jul 22, 22:20 UTCJul 23, 00:10 UTC1h 50m
2026-07-22 SKW3701 BOS → CLE Jul 22, 22:17 UTCJul 23, 00:04 UTC1h 47m
2026-07-22 SKW3959 MSP → BIS Jul 22, 19:50 UTCJul 22, 21:00 UTC1h 10m
2026-07-22 SKW3959 MSP → BIS Jul 22, 19:45 UTCJul 22, 20:45 UTC1h 0m
2026-07-22 SKW3750 BOI → SEA Jul 22, 16:50 UTCJul 22, 18:00 UTC1h 10m
2026-07-22 SKW3750 BOI → SEA Jul 22, 14:50 UTCJul 22, 15:50 UTC1h 0m
2026-07-22 SKW4008 DTW → MKE Jul 22, 12:40 UTCJul 22, 13:10 UTC30m
2026-07-22 SKW4100 MDW → DTW Jul 22, 04:15 UTCJul 22, 05:25 UTC1h 10m
2026-07-22 SKW4100 MDW → DTW Jul 22, 01:20 UTCJul 22, 03:15 UTC1h 55m
2026-07-21 SKW3891 LAX → OAK Jul 21, 22:55 UTCJul 21, 23:30 UTC35m
2026-07-21 SKW3891 LAX → OAK Jul 21, 21:10 UTCJul 21, 21:40 UTC30m
2026-07-21 SKW3824 BMI → ATL Jul 21, 19:00 UTCJul 21, 19:55 UTC55m
2026-07-21 SKW3824 BMI → ATL Jul 21, 17:05 UTCJul 21, 17:45 UTC40m
2026-07-21 SKW3790 RIC → DTW Jul 21, 14:25 UTCJul 21, 15:15 UTC50m
2026-07-21 SKW3677 BOS → EWR Jul 21, 03:35 UTCJul 21, 04:15 UTC40m
2026-07-21 SKW4127 MSP → PIT Jul 21, 01:20 UTCJul 21, 02:25 UTC1h 5m
2026-07-20 SKW4127 MSP → PIT Jul 20, 22:20 UTCJul 20, 23:20 UTC1h 0m
2026-07-20 SKW3878 CLE → LGA Jul 20, 20:00 UTCJul 20, 20:50 UTC50m
2026-07-20 SKW3806 LAX → OAK Jul 20, 17:30 UTCJul 20, 18:45 UTC1h 15m
2026-07-20 SKW174P YYC → SLC Jul 20, 14:20 UTCJul 20, 15:55 UTC1h 35m
2026-07-20 SKW154F SLC → YYC Jul 20, 02:55 UTCJul 20, 04:35 UTC1h 40m
2026-07-20 SKW4449 COS → SLC Jul 20, 00:45 UTCJul 20, 02:00 UTC1h 15m

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 N323SY page for operator, model, and routing details .

Mode-S A37B1C frequently asked

What is Mode-S code A37B1C?
A37B1C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N323SY.
Where is Mode-S A37B1C registered?
Mode-S code A37B1C 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 A37B1C broadcasting right now?
Yes. Mode-S A37B1C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A37B1C, octal 50675434, decimal 10,713,884.
What flights does A37B1C operate?
Mode-S A37B1C has broadcast 20 distinct callsigns, including SKW3699, SKW3989, SKW3561, SKW3536, SKW182J.