Apparatus

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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 Jul 26, 20:45 UTC
Flights observed
702
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:45 UTC

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
SKW4066 - 12 2026-07-14
SKW4055 SkyWest Airlines 12 2026-07-25
SKW3864 - 12 2026-07-21
SKW3861 - 11 2026-07-11
SKW4080 - 10 2026-07-16
SKW4051 SkyWest Airlines 10 2026-06-03
SKW4024 SkyWest Airlines 10 2026-07-24
SKW3967 - 10 2026-07-15
SKW3836 SkyWest Airlines 10 2026-06-11
SKW3636 SkyWest Airlines 10 2026-07-26
SKW4154 - 9 2026-07-17
SKW4144 - 9 2026-07-07
SKW3990 SkyWest Airlines 9 2026-07-21
SKW3851 SkyWest Airlines 9 2026-05-14
SKW3838 SkyWest Airlines 9 2026-05-17
SKW3538 - 9 2026-07-17
SKW4168 SkyWest Airlines 8 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3636 CLE → BOS Jul 26, 20:05 UTCJul 26, 20:45 UTC40m
2026-07-26 SKW3636 CLE → BOS Jul 26, 18:05 UTCJul 26, 18:50 UTC45m
2026-07-26 SKW3626 MDW → MSP Jul 26, 09:55 UTCJul 26, 11:25 UTC1h 30m
2026-07-26 SKW3626 MDW → MSP Jul 26, 09:57 UTCJul 26, 11:22 UTC1h 25m
2026-07-26 SKW3795 MSP → OKC Jul 26, 01:50 UTCJul 26, 03:05 UTC1h 15m
2026-07-26 SKW3795 MSP → OKC Jul 26, 01:49 UTCJul 26, 03:05 UTC1h 16m
2026-07-25 SKW4040 ATL → HPN Jul 25, 21:10 UTCJul 25, 22:40 UTC1h 30m
2026-07-25 SKW4040 ATL → HPN Jul 25, 18:30 UTCJul 25, 19:50 UTC1h 20m
2026-07-25 SKW4055 SJC → SEA Jul 25, 15:40 UTCJul 25, 17:10 UTC1h 30m
2026-07-25 SKW4055 SJC → SEA Jul 25, 13:00 UTCJul 25, 14:35 UTC1h 35m
2026-07-25 SKW3626 MDW → MSP Jul 25, 09:55 UTCJul 25, 11:30 UTC1h 35m
2026-07-25 SKW3626 MDW → MSP Jul 25, 09:55 UTCJul 25, 11:23 UTC1h 28m
2026-07-25 SKW3795 MSP → OKC Jul 25, 01:45 UTCJul 25, 03:10 UTC1h 25m
2026-07-24 SKW3782 SMF → LAX Jul 24, 23:05 UTCJul 24, 23:45 UTC40m
2026-07-24 SKW3782 SMF → LAX Jul 24, 23:06 UTCJul 24, 23:38 UTC32m
2026-07-24 SKW3782 SMF → LAX Jul 24, 21:10 UTCJul 24, 21:40 UTC30m
2026-07-24 SKW4034 CLE → BOS Jul 24, 19:25 UTCJul 24, 19:55 UTC30m
2026-07-24 SKW4034 CLE → BOS Jul 24, 17:35 UTCJul 24, 18:05 UTC30m
2026-07-24 SKW3898 IAD → MSP Jul 24, 15:55 UTCJul 24, 16:15 UTC20m
2026-07-24 SKW3898 IAD → MSP Jul 24, 14:30 UTCJul 24, 14:55 UTC25m
2026-07-24 SKW4110 OAK → LAX Jul 24, 11:40 UTCJul 24, 13:00 UTC1h 20m
2026-07-24 SKW4024 IND → DTW Jul 24, 00:20 UTCJul 24, 01:05 UTC45m
2026-07-23 SKW4167 MSP → RST Jul 23, 22:00 UTCJul 23, 23:15 UTC1h 15m
2026-07-23 SKW4167 MSP → RST Jul 23, 20:00 UTCJul 23, 21:00 UTC1h 0m
2026-07-23 SKW3666 DTW → MDW Jul 23, 17:10 UTCJul 23, 17:35 UTC25m
2026-07-23 SKW3666 DTW → MDW Jul 23, 17:08 UTCJul 23, 17:31 UTC23m
2026-07-23 SKW3666 DTW → MDW Jul 23, 15:35 UTCJul 23, 15:55 UTC20m
2026-07-23 SKW3542 SEA → SFO Jul 23, 12:45 UTCJul 23, 14:30 UTC1h 45m
2026-07-23 SKW3541 BNA → JFK Jul 23, 01:30 UTCJul 23, 02:45 UTC1h 15m
2026-07-22 SKW3948 HPN → ATL Jul 22, 23:30 UTCJul 23, 00:15 UTC45m
2026-07-22 SKW188F MSP → OMA Jul 22, 21:55 UTCJul 22, 22:40 UTC45m
2026-07-22 SKW3995 IND → DTW Jul 22, 19:50 UTCJul 22, 20:45 UTC55m
2026-07-22 SKW3995 IND → DTW Jul 22, 16:15 UTCJul 22, 17:00 UTC45m
2026-07-22 SKW4136 SJC → LAX Jul 22, 13:15 UTCJul 22, 14:10 UTC55m
2026-07-21 SKW4143 DTW → BUF Jul 21, 23:52 UTCJul 22, 01:00 UTC1h 8m
2026-07-21 SKW4143 DTW → BUF Jul 21, 23:50 UTCJul 22, 00:50 UTC1h 0m
2026-07-21 SKW3595 ATL → CHA Jul 21, 20:55 UTCJul 21, 22:15 UTC1h 20m
2026-07-21 SKW3595 ATL → CHA Jul 21, 18:45 UTCJul 21, 20:00 UTC1h 15m
2026-07-21 SKW3990 TVC → DTW Jul 21, 15:45 UTCJul 21, 16:50 UTC1h 5m
2026-07-21 SKW3990 TVC → DTW Jul 21, 13:30 UTCJul 21, 14:25 UTC55m
2026-07-21 SKW3864 - Jul 21, 11:10 UTCJul 21, 12:00 UTC50m
2026-07-21 SKW3864 OMA → MSP Jul 21, 11:15 UTCJul 21, 11:55 UTC40m
2026-07-21 SKW4024 IND → DTW Jul 21, 00:10 UTCJul 21, 01:00 UTC50m
2026-07-20 SKW4167 STL → MSP Jul 20, 21:05 UTCJul 20, 22:45 UTC1h 40m
2026-07-20 SKW4167 MSP → STL Jul 20, 18:50 UTCJul 20, 19:50 UTC1h 0m
2026-07-20 SKW3666 - Jul 20, 17:00 UTCJul 20, 17:40 UTC40m
2026-07-20 SKW3666 - Jul 20, 15:25 UTCJul 20, 15:45 UTC20m
2026-07-20 SKW3542 - Jul 20, 12:35 UTCJul 20, 14:05 UTC1h 30m
2026-07-20 SKW3541 MSP → ICT Jul 20, 01:30 UTCJul 20, 02:40 UTC1h 10m
2026-07-19 SKW3948 HPN → ATL Jul 19, 22:50 UTCJul 19, 23:40 UTC50m

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 Jul 26, 20:45 UTC.
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, SKW4066, SKW4055.