Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A15C01

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N187PQ · BOMBARDIER Regional Jet CRJ-900 · operated by DELTA AIR LINES INC

Hex
A15C01
Octal
50256001
Decimal
10,574,849
Country
US
Tail
N187PQ
Type
CRJ9
No current signal · last broadcast 3h ago
Flights observed
615
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A15C01.

Country allocation

The ICAO 24-bit address A15C01 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
SKW4130 - 17 2026-07-07
SKW3868 - 16 2026-07-11
SKW4103 - 12 2026-07-10
SKW3861 - 11 2026-07-11
SKW4066 - 10 2026-07-09
SKW4055 SkyWest Airlines 10 2026-07-03
SKW4051 SkyWest Airlines 10 2026-06-03
SKW3864 - 10 2026-07-11
SKW3836 SkyWest Airlines 10 2026-06-11
SKW4144 - 9 2026-07-07
SKW4080 - 9 2026-07-10
SKW3851 SkyWest Airlines 9 2026-05-14
SKW3838 SkyWest Airlines 9 2026-05-17
SKW4168 SkyWest Airlines 8 2026-05-03
SKW4154 - 8 2026-06-14
SKW4024 - 8 2026-06-18
SKW3967 SkyWest Airlines 8 2026-06-15
SKW3785 - 8 2026-06-30
SKW3699 SkyWest Airlines 8 2026-06-03
SKW3642 SkyWest Airlines 8 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW125R MSP → YYZ Jul 14, 01:10 UTCJul 14, 02:50 UTC1h 40m
2026-07-13 SKW3843 - Jul 13, 21:30 UTCJul 13, 22:10 UTC40m
2026-07-13 SKW3843 - Jul 13, 19:25 UTCJul 13, 20:05 UTC40m
2026-07-13 SKW3971 - Jul 13, 17:35 UTCJul 13, 18:40 UTC1h 5m
2026-07-13 SKW3971 - Jul 13, 15:30 UTCJul 13, 16:30 UTC1h 0m
2026-07-13 SKW4073 YYZ → MSP Jul 13, 10:40 UTCJul 13, 12:10 UTC1h 30m
2026-07-13 SKW125R MSP → YYZ Jul 13, 01:35 UTCJul 13, 03:10 UTC1h 35m
2026-07-13 SKW125R MSP → YYZ Jul 13, 01:31 UTCJul 13, 03:10 UTC1h 39m
2026-07-12 SKW4167 STL → MSP Jul 12, 21:45 UTCJul 12, 22:50 UTC1h 5m
2026-07-12 SKW4167 MSP → STL Jul 12, 19:45 UTCJul 12, 20:45 UTC1h 0m
2026-07-12 SKW3971 - Jul 12, 17:30 UTCJul 12, 18:35 UTC1h 5m
2026-07-12 SKW3971 RAP → MSP Jul 12, 17:25 UTCJul 12, 18:24 UTC59m
2026-07-12 SKW3971 - Jul 12, 14:40 UTCJul 12, 15:40 UTC1h 0m
2026-07-12 SKW3922 - Jul 12, 13:05 UTCJul 12, 13:35 UTC30m
2026-07-11 SKW3912 MSP → DLH Jul 11, 23:52 UTCJul 12, 00:10 UTC18m
2026-07-11 SKW3912 - Jul 11, 23:45 UTCJul 12, 00:05 UTC20m
2026-07-11 SKW3861 - Jul 11, 21:25 UTCJul 11, 22:15 UTC50m
2026-07-11 SKW3861 MSP → ATW Jul 11, 19:45 UTCJul 11, 20:30 UTC45m
2026-07-11 SKW149R YYZ → MSP Jul 11, 16:45 UTCJul 11, 18:25 UTC1h 40m
2026-07-11 SKW3868 MSP → YYZ Jul 11, 13:55 UTCJul 11, 15:13 UTC1h 18m
2026-07-11 SKW3868 MSP → YYZ Jul 11, 13:40 UTCJul 11, 15:15 UTC1h 35m
2026-07-11 SKW3864 OMA → MSP Jul 11, 11:20 UTCJul 11, 12:10 UTC50m
2026-07-11 SKW3864 OMA → MSP Jul 11, 11:19 UTCJul 11, 12:08 UTC49m
2026-07-11 SKW4014 - Jul 11, 02:50 UTCJul 11, 03:30 UTC40m
2026-07-10 SKW3829 YYZ → MSP Jul 10, 23:40 UTCJul 11, 01:25 UTC1h 45m
2026-07-10 SKW4080 MSP → YYZ Jul 10, 20:50 UTCJul 10, 22:15 UTC1h 25m
2026-07-10 SKW3995 - Jul 10, 18:05 UTCJul 10, 19:05 UTC1h 0m
2026-07-10 SKW3995 - Jul 10, 16:00 UTCJul 10, 16:40 UTC40m
2026-07-10 SKW4103 - Jul 10, 14:10 UTCJul 10, 14:55 UTC45m
2026-07-10 SKW4103 - Jul 10, 12:25 UTCJul 10, 13:05 UTC40m
2026-07-10 SKW3840 FSD → MSP Jul 10, 10:15 UTCJul 10, 10:55 UTC40m
2026-07-10 SKW3578 MSP → FSD Jul 10, 01:33 UTCJul 10, 01:56 UTC23m
2026-07-10 SKW3578 MSP → FSD Jul 10, 01:25 UTCJul 10, 02:00 UTC35m
2026-07-09 SKW3538 FSD → MSP Jul 9, 23:45 UTCJul 10, 00:20 UTC35m
2026-07-09 SKW3538 MSP → FSD Jul 9, 20:30 UTCJul 9, 21:05 UTC35m
2026-07-09 SKW4066 - Jul 9, 17:45 UTCJul 9, 18:35 UTC50m
2026-07-09 SKW4066 BIS → MSP Jul 9, 17:45 UTCJul 9, 18:34 UTC49m
2026-07-09 SKW4066 - Jul 9, 15:35 UTCJul 9, 16:20 UTC45m
2026-07-09 SKW4103 OAK → SLC Jul 9, 14:00 UTCJul 9, 14:15 UTC15m
2026-07-09 SKW4103 OAK → SLC Jul 9, 14:00 UTCJul 9, 14:39 UTC39m
2026-07-09 SKW4103 OAK → SLC Jul 9, 12:10 UTCJul 9, 12:45 UTC35m
2026-07-09 SKW3840 FSD → MSP Jul 9, 10:12 UTCJul 9, 10:41 UTC29m
2026-07-09 SKW3840 FSD → MSP Jul 9, 10:10 UTCJul 9, 10:50 UTC40m
2026-07-08 SKW3578 MSP → FSD Jul 8, 23:50 UTCJul 9, 00:30 UTC40m
2026-07-08 SKW3538 FSD → MSP Jul 8, 21:50 UTCJul 8, 22:30 UTC40m
2026-07-08 SKW3538 MSP → FSD Jul 8, 20:00 UTCJul 8, 20:45 UTC45m
2026-07-08 SKW3920 - Jul 8, 17:20 UTCJul 8, 18:05 UTC45m
2026-07-08 SKW129W - Jul 8, 15:35 UTCJul 8, 16:20 UTC45m
2026-07-08 SKW129W MSP → GRB Jul 8, 15:35 UTCJul 8, 16:20 UTC45m
2026-07-08 SKW3542 - Jul 8, 12:40 UTCJul 8, 14:05 UTC1h 25m

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 N187PQ page for operator, model, and routing details .

Mode-S A15C01 frequently asked

What is Mode-S code A15C01?
A15C01 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N187PQ.
Where is Mode-S A15C01 registered?
Mode-S code A15C01 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 A15C01 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A15C01, octal 50256001, decimal 10,574,849.
What flights does A15C01 operate?
Mode-S A15C01 has broadcast 20 distinct callsigns, including SKW4130, SKW3868, SKW4103, SKW3861, SKW4066.