Apparatus

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sensors Mode-S transponder

AA2571

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N753CS · BOEING 757-200

Hex
AA2571
Octal
52422561
Decimal
11,150,705
Country
US
Tail
N753CS
Type
B752
Broadcasting now · callsign CSB107 · 39,000 ft
Flights observed
63
Distinct callsigns
10
Country
US
Last broadcast
23m ago

Current position

AA2571 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA2571 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 10 distinct

Callsign Airline Flights Last seen
CSB594 21 Air 13 2026-05-23
CSB585 21 Air 12 2026-05-14
CSB194 21 Air 11 2026-05-22
CSB185 21 Air 11 2026-05-15
CSB507 21 Air 6 2026-05-29
CSB107 21 Air 6 2026-05-30
CSB2049 21 Air 1 2026-04-22
CSB2022 21 Air 1 2026-04-20
CSB2019 21 Air 1 2026-04-22
CSB2002 21 Air 1 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSB107 HRL → CVG May 30, 02:06 UTCMay 30, 02:15 UTC9m
2026-05-29 CSB507 CVG → HRL May 29, 11:15 UTCMay 29, 13:35 UTC2h 20m
2026-05-29 CSB107 HRL → CVG May 29, 02:15 UTCMay 29, 04:35 UTC2h 20m
2026-05-28 CSB507 CVG → HRL May 28, 11:05 UTCMay 28, 13:35 UTC2h 30m
2026-05-27 CSB107 HRL → CVG May 27, 03:50 UTCMay 27, 05:59 UTC2h 10m
2026-05-26 CSB507 CVG → HRL May 26, 10:44 UTCMay 26, 13:15 UTC2h 30m
2026-05-25 CSB107 HRL → CVG May 25, 08:50 UTCMay 25, 11:05 UTC2h 15m
2026-05-25 CSB507 CVG → HRL May 25, 04:20 UTCMay 25, 06:55 UTC2h 35m
2026-05-23 CSB594 CVG → DEN May 23, 03:40 UTCMay 23, 06:40 UTC3h 0m
2026-05-22 CSB594 CVG → DEN May 22, 12:20 UTCMay 22, 15:45 UTC3h 25m
2026-05-22 CSB194 DEN → CVG May 22, 05:10 UTCMay 22, 07:25 UTC2h 15m
2026-05-22 CSB194 DEN → CVG May 22, 01:50 UTCMay 22, 02:45 UTC55m
2026-05-21 CSB594 CVG → DEN May 21, 14:15 UTCMay 21, 15:20 UTC1h 5m
2026-05-21 CSB594 CVG → DEN May 21, 10:30 UTCMay 21, 13:01 UTC2h 30m
2026-05-20 CSB194 DEN → CVG May 20, 04:15 UTCMay 20, 06:25 UTC2h 11m
2026-05-20 CSB194 DEN → CVG May 20, 01:30 UTCMay 20, 02:30 UTC1h 0m
2026-05-19 CSB594 CVG → DEN May 19, 14:30 UTCMay 19, 15:35 UTC1h 5m
2026-05-19 CSB594 CVG → DEN May 19, 10:40 UTCMay 19, 13:20 UTC2h 40m
2026-05-19 CSB194 DEN → CVG May 19, 04:40 UTCMay 19, 07:30 UTC2h 50m
2026-05-19 CSB194 DEN → CVG May 19, 01:45 UTCMay 19, 02:45 UTC1h 0m
2026-05-18 CSB594 CVG → DEN May 18, 10:30 UTCMay 18, 11:30 UTC1h 0m
2026-05-18 CSB594 CVG → DEN May 18, 06:35 UTCMay 18, 09:00 UTC2h 25m
2026-05-16 CSB194 DEN → CVG May 16, 01:50 UTCMay 16, 04:45 UTC2h 55m
2026-05-15 CSB594 CVG → DEN May 15, 12:25 UTCMay 15, 15:40 UTC3h 14m
2026-05-15 CSB185 MSP → CVG May 15, 03:00 UTCMay 15, 04:20 UTC1h 20m
2026-05-14 CSB585 CVG → MSP May 14, 10:35 UTCMay 14, 12:10 UTC1h 35m
2026-05-13 CSB194 DEN → CVG May 13, 05:20 UTCMay 13, 07:25 UTC2h 5m
2026-05-13 CSB194 DEN → CVG May 13, 01:40 UTCMay 13, 02:35 UTC55m
2026-05-12 CSB594 CVG → DEN May 12, 14:20 UTCMay 12, 15:25 UTC1h 5m
2026-05-12 CSB594 CVG → DEN May 12, 10:30 UTCMay 12, 13:05 UTC2h 35m
2026-05-09 CSB185 MSP → CVG May 9, 03:20 UTCMay 9, 04:45 UTC1h 25m
2026-05-09 CSB185 MSP → CVG May 9, 02:55 UTCMay 9, 03:00 UTC5m
2026-05-08 CSB585 CVG → MSP May 8, 10:54 UTCMay 8, 12:30 UTC1h 35m
2026-04-30 CSB107 HRL → CVG Apr 30, 02:10 UTCApr 30, 04:35 UTC2h 25m
2026-04-29 CSB507 CVG → HRL Apr 29, 10:55 UTCApr 29, 13:25 UTC2h 30m
2026-04-28 CSB185 MSP → CVG Apr 28, 03:00 UTCApr 28, 05:15 UTC2h 15m
2026-04-27 CSB585 CVG → MSP Apr 27, 06:35 UTCApr 27, 08:00 UTC1h 25m
2026-04-24 CSB194 DEN → CVG Apr 24, 04:10 UTCApr 24, 07:10 UTC3h 0m
2026-04-24 CSB194 DEN → CVG Apr 24, 01:50 UTCApr 24, 02:50 UTC1h 0m
2026-04-23 CSB594 CVG → DEN Apr 23, 14:55 UTCApr 23, 16:00 UTC1h 5m
2026-04-23 CSB594 CVG → DEN Apr 23, 10:50 UTCApr 23, 13:15 UTC2h 25m
2026-04-22 CSB2019 MIA → CVG Apr 22, 11:50 UTCApr 22, 14:05 UTC2h 15m
2026-04-22 CSB2049 CVG → MIA Apr 22, 07:10 UTCApr 22, 09:15 UTC2h 5m
2026-04-22 CSB107 HRL → CVG Apr 22, 02:30 UTCApr 22, 05:01 UTC2h 30m
2026-04-21 CSB507 CVG → HRL Apr 21, 11:00 UTCApr 21, 13:35 UTC2h 35m
2026-04-20 CSB2002 DEN → CVG Apr 20, 12:50 UTCApr 20, 15:00 UTC2h 10m
2026-04-20 CSB2022 MIA → CVG Apr 20, 07:50 UTCApr 20, 10:25 UTC2h 35m
2026-04-18 CSB185 MSP → CVG Apr 18, 03:25 UTCApr 18, 04:45 UTC1h 20m
2026-04-18 CSB185 MSP → CVG Apr 18, 02:50 UTCApr 18, 03:20 UTC30m
2026-04-17 CSB585 CVG → MSP Apr 17, 11:20 UTCApr 17, 12:15 UTC55m

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 N753CS page for operator, model, and routing details .

Mode-S AA2571 frequently asked

What is Mode-S code AA2571?
AA2571 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N753CS.
Where is Mode-S AA2571 registered?
Mode-S code AA2571 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 AA2571 broadcasting right now?
Yes. Mode-S AA2571 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA2571, octal 52422561, decimal 11,150,705.
What flights does AA2571 operate?
Mode-S AA2571 has broadcast 10 distinct callsigns, including CSB594, CSB585, CSB194, CSB185, CSB507.