Apparatus

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sensors Mode-S transponder

A0A644

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1409A · BOEING 767-300 · operated by MSN 27959 LLC

Hex
A0A644
Octal
50123104
Decimal
10,528,324
Country
US
Tail
N1409A
Type
B763
Broadcasting now · callsign CSB7796 · 15,525 ft
Flights observed
184
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A0A644 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0A644 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
CSB7508 21 Air 22 2026-05-26
CSB7521 21 Air 14 2026-05-28
CSB7510 21 Air 14 2026-05-21
CSB7715 21 Air 12 2026-05-21
CSB7797 21 Air 11 2026-05-29
CSB7505 21 Air 11 2026-05-27
CSB7504 21 Air 9 2026-05-26
CSB7501 21 Air 9 2026-05-22
CSB7796 21 Air 8 2026-05-29
CSB7512 21 Air 8 2026-05-29
CSB7509 21 Air 8 2026-05-28
CSB7507 21 Air 7 2026-05-20
CSB7598 21 Air 6 2026-05-28
CSB7756 21 Air 5 2026-04-27
CSB7592 21 Air 5 2026-05-27
CSB7741 21 Air 4 2026-05-14
CSB7740 21 Air 4 2026-05-27
CSB7515 21 Air 4 2026-05-28
CSB7792 21 Air 3 2026-04-29
CSB7791 21 Air 3 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSB7796 BOG → MIA May 29, 22:35 UTCMay 29, 22:45 UTC10m
2026-05-29 CSB7797 MIA → BOG May 29, 19:50 UTCMay 29, 20:05 UTC15m
2026-05-29 CSB7797 MIA → BOG May 29, 17:10 UTCMay 29, 17:35 UTC25m
2026-05-29 CSB7512 CVG → SJU May 29, 03:50 UTCMay 29, 05:50 UTC2h 0m
2026-05-28 CSB7509 CVG → ORD May 28, 23:05 UTCMay 29, 01:05 UTC2h 0m
2026-05-28 CSB7598 SJU → CVG May 28, 17:05 UTCMay 28, 17:40 UTC35m
2026-05-28 CSB7598 SJU → CVG May 28, 15:10 UTCMay 28, 15:25 UTC15m
2026-05-28 CSB7521 BWI → MIA May 28, 12:55 UTCMay 28, 13:05 UTC10m
2026-05-28 CSB7521 BWI → MIA May 28, 11:00 UTCMay 28, 11:20 UTC20m
2026-05-28 CSB7515 CVG → MIA May 28, 04:40 UTCMay 28, 06:40 UTC2h 0m
2026-05-27 CSB7592 SJU → CVG May 27, 20:45 UTCMay 28, 00:30 UTC3h 45m
2026-05-27 CSB7505 MIA → BWI May 27, 18:15 UTCMay 27, 18:30 UTC15m
2026-05-27 CSB7505 MIA → BWI May 27, 16:15 UTCMay 27, 16:35 UTC20m
2026-05-27 CSB7740 SJU → UIO May 27, 02:24 UTCMay 27, 11:45 UTC9h 21m
2026-05-26 CSB7508 CVG → MIA May 26, 20:00 UTCMay 26, 21:44 UTC1h 45m
2026-05-26 CSB7504 ORD → CVG May 26, 08:15 UTCMay 26, 10:10 UTC1h 55m
2026-05-26 CSB7512 CVG → SJU May 26, 03:50 UTCMay 26, 05:54 UTC2h 5m
2026-05-25 CSB7509 CVG → ORD May 25, 23:10 UTCMay 26, 01:14 UTC2h 5m
2026-05-25 CSB7699 SJU → UIO May 25, 01:55 UTCMay 25, 11:35 UTC9h 40m
2026-05-24 CSB7508 CVG → MIA May 24, 23:05 UTCMay 24, 23:20 UTC15m
2026-05-24 CSB7508 CVG → MIA May 24, 19:40 UTCMay 24, 21:30 UTC1h 50m
2026-05-24 CSB7504 ORD → CVG May 24, 08:10 UTCMay 24, 10:15 UTC2h 5m
2026-05-24 CSB7512 CVG → SJU May 24, 04:05 UTCMay 24, 06:05 UTC2h 0m
2026-05-23 CSB7509 CVG → ORD May 23, 23:15 UTCMay 24, 01:25 UTC2h 10m
2026-05-23 CSB7740 SJU → UIO May 23, 02:25 UTCMay 23, 11:45 UTC9h 19m
2026-05-22 CSB7508 CVG → MIA May 22, 23:05 UTCMay 22, 23:25 UTC20m
2026-05-22 CSB7508 CVG → MIA May 22, 19:50 UTCMay 22, 21:35 UTC1h 45m
2026-05-22 CSB7501 MIA → CVG May 22, 05:25 UTCMay 22, 07:30 UTC2h 5m
2026-05-21 CSB7796 BOG → MIA May 21, 21:15 UTCMay 22, 00:20 UTC3h 5m
2026-05-21 CSB7797 MIA → BOG May 21, 16:05 UTCMay 21, 19:10 UTC3h 5m
2026-05-21 CSB7715 BOG → MIA May 21, 08:50 UTCMay 21, 12:00 UTC3h 10m
2026-05-21 CSB7510 ORD → CVG May 21, 03:00 UTCMay 21, 06:00 UTC3h 0m
2026-05-20 CSB7507 BWI → MIA May 20, 20:10 UTCMay 20, 22:10 UTC2h 0m
2026-05-20 CSB7501 MIA → CVG May 20, 10:15 UTCMay 20, 12:20 UTC2h 5m
2026-05-20 CSB7507 BWI → MIA May 20, 05:35 UTCMay 20, 07:35 UTC2h 0m
2026-05-19 CSB7506 CVG → MIA May 19, 18:50 UTCMay 19, 21:00 UTC2h 10m
2026-05-19 CSB7597 SJU → MIA May 19, 01:45 UTCMay 19, 04:00 UTC2h 15m
2026-05-18 CSB7508 CVG → MIA May 18, 23:05 UTCMay 18, 23:15 UTC10m
2026-05-18 CSB7508 CVG → MIA May 18, 19:50 UTCMay 18, 21:30 UTC1h 40m
2026-05-18 CSB7504 ORD → CVG May 18, 08:45 UTCMay 18, 10:55 UTC2h 10m
2026-05-16 CSB7796 BOG → MIA May 16, 21:25 UTCMay 17, 00:40 UTC3h 15m
2026-05-16 CSB7797 MIA → BOG May 16, 16:10 UTCMay 16, 19:05 UTC2h 55m
2026-05-16 CSB7715 BOG → MIA May 16, 08:46 UTCMay 16, 11:55 UTC3h 10m
2026-05-16 CSB7510 ORD → CVG May 16, 06:25 UTCMay 16, 06:45 UTC20m
2026-05-16 CSB7510 ORD → CVG May 16, 03:40 UTCMay 16, 04:10 UTC30m
2026-05-15 CSB7796 BOG → MIA May 15, 21:40 UTCMay 16, 00:45 UTC3h 5m
2026-05-15 CSB7797 MIA → BOG May 15, 19:40 UTCMay 15, 20:00 UTC20m
2026-05-15 CSB7797 MIA → BOG May 15, 16:50 UTCMay 15, 17:15 UTC25m
2026-05-15 CSB7715 BOG → MIA May 15, 12:05 UTCMay 15, 12:40 UTC35m
2026-05-15 CSB7715 BOG → MIA May 15, 09:40 UTCMay 15, 09:50 UTC10m

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 N1409A page for operator, model, and routing details .

Mode-S A0A644 frequently asked

What is Mode-S code A0A644?
A0A644 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1409A.
Where is Mode-S A0A644 registered?
Mode-S code A0A644 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 A0A644 broadcasting right now?
Yes. Mode-S A0A644 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A644, octal 50123104, decimal 10,528,324.
What flights does A0A644 operate?
Mode-S A0A644 has broadcast 20 distinct callsigns, including CSB7508, CSB7521, CSB7510, CSB7715, CSB7797.