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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 CSB7741 · 950 ft
Flights observed
362
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:55 UTC

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 42 2026-07-23
CSB7505 21 Air 35 2026-07-24
CSB7521 21 Air 26 2026-07-25
CSB7510 21 Air 20 2026-07-19
CSB7715 21 Air 18 2026-07-19
CSB7592 21 Air 18 2026-07-24
CSB7512 21 Air 15 2026-07-26
CSB7509 21 Air 15 2026-07-25
CSB7797 21 Air 14 2026-07-18
CSB7515 21 Air 14 2026-07-25
CSB7504 - 14 2026-06-30
CSB7796 21 Air 13 2026-07-18
CSB7598 21 Air 12 2026-07-25
CSB7501 - 12 2026-07-10
CSB7507 - 11 2026-07-08
CSB7506 21 Air 11 2026-07-26
CSB7740 21 Air 10 2026-07-24
CSB7741 - 8 2026-07-11
CSB7756 - 6 2026-07-14
CSB7526 21 Air 6 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSB7506 CVG → MIA Jul 26, 20:30 UTCJul 26, 22:55 UTC2h 25m
2026-07-26 CSB7512 CVG → SJU Jul 26, 03:50 UTCJul 26, 05:50 UTC2h 0m
2026-07-25 CSB7509 CVG → ORD Jul 25, 22:45 UTCJul 26, 01:30 UTC2h 45m
2026-07-25 CSB7598 SJU → CVG Jul 25, 15:25 UTCJul 25, 17:35 UTC2h 10m
2026-07-25 CSB7521 BWI → MIA Jul 25, 12:50 UTCJul 25, 13:00 UTC10m
2026-07-25 CSB7521 BWI → MIA Jul 25, 10:55 UTCJul 25, 11:20 UTC25m
2026-07-25 CSB7515 CVG → MIA Jul 25, 04:55 UTCJul 25, 06:55 UTC2h 0m
2026-07-24 CSB7592 SJU → CVG Jul 24, 20:45 UTCJul 25, 00:30 UTC3h 45m
2026-07-24 CSB7505 MIA → BWI Jul 24, 18:00 UTCJul 24, 18:10 UTC10m
2026-07-24 CSB7505 MIA → BWI Jul 24, 16:05 UTCJul 24, 16:25 UTC20m
2026-07-24 CSB7740 SJU → UIO Jul 24, 02:30 UTCJul 24, 11:40 UTC9h 10m
2026-07-23 CSB7508 CVG → MIA Jul 23, 23:25 UTCJul 23, 23:45 UTC20m
2026-07-23 CSB7508 CVG → MIA Jul 23, 20:05 UTCJul 23, 21:45 UTC1h 40m
2026-07-22 CSB7506 CVG → MIA Jul 22, 20:40 UTCJul 22, 22:50 UTC2h 10m
2026-07-22 CSB7740 - Jul 22, 03:35 UTCJul 22, 12:30 UTC8h 55m
2026-07-22 CSB7508 - Jul 22, 00:55 UTCJul 22, 01:15 UTC20m
2026-07-21 CSB7508 - Jul 21, 21:35 UTCJul 21, 23:20 UTC1h 45m
2026-07-21 CSB7526 JAX → CVG Jul 21, 09:05 UTCJul 21, 10:30 UTC1h 25m
2026-07-21 CSB7525 - Jul 21, 05:10 UTCJul 21, 06:25 UTC1h 15m
2026-07-20 CSB7546 JAX → CVG Jul 20, 23:45 UTCJul 21, 01:15 UTC1h 30m
2026-07-20 CSB7545 CVG → JAX Jul 20, 20:00 UTCJul 20, 21:25 UTC1h 25m
2026-07-20 CSB7526 JAX → CVG Jul 20, 09:10 UTCJul 20, 10:35 UTC1h 25m
2026-07-20 CSB7525 - Jul 20, 05:25 UTCJul 20, 06:45 UTC1h 20m
2026-07-19 CSB7506 CVG → MIA Jul 19, 20:55 UTCJul 19, 22:55 UTC2h 0m
2026-07-19 CSB7715 BOG → MIA Jul 19, 08:55 UTCJul 19, 12:05 UTC3h 10m
2026-07-19 CSB7510 ORD → CVG Jul 19, 03:55 UTCJul 19, 06:55 UTC3h 0m
2026-07-18 CSB7796 BOG → MIA Jul 18, 21:45 UTCJul 19, 01:00 UTC3h 15m
2026-07-18 CSB7797 MIA → BOG Jul 18, 16:45 UTCJul 18, 19:45 UTC3h 0m
2026-07-18 CSB7512 - Jul 18, 04:40 UTCJul 18, 06:40 UTC2h 0m
2026-07-18 CSB7509 - Jul 18, 00:00 UTCJul 18, 02:09 UTC2h 10m
2026-07-17 CSB7515 - Jul 17, 04:39 UTCJul 17, 06:45 UTC2h 5m
2026-07-16 CSB7592 - Jul 16, 16:00 UTCJul 17, 00:30 UTC8h 30m
2026-07-16 CSB7740 - Jul 16, 03:25 UTCJul 16, 11:40 UTC8h 15m
2026-07-15 CSB7508 - Jul 15, 23:45 UTCJul 16, 00:05 UTC20m
2026-07-15 CSB7508 - Jul 15, 20:25 UTCJul 15, 22:10 UTC1h 45m
2026-07-15 CSB7526 - Jul 15, 11:50 UTCJul 15, 13:10 UTC1h 20m
2026-07-15 CSB7525 - Jul 15, 07:50 UTCJul 15, 09:10 UTC1h 20m
2026-07-14 CSB7546 - Jul 14, 22:35 UTCJul 15, 00:05 UTC1h 29m
2026-07-14 CSB7545 - Jul 14, 19:05 UTCJul 14, 20:25 UTC1h 20m
2026-07-14 CSB7756 - Jul 14, 07:15 UTCJul 14, 09:15 UTC2h 0m
2026-07-14 CSB7511 - Jul 14, 02:15 UTCJul 14, 04:30 UTC2h 15m
2026-07-13 CSB7506 MIA → CVG Jul 13, 20:10 UTCJul 13, 22:15 UTC2h 5m
2026-07-13 CSB7512 - Jul 13, 05:25 UTCJul 13, 07:30 UTC2h 5m
2026-07-13 CSB7509 - Jul 13, 00:50 UTCJul 13, 03:05 UTC2h 15m
2026-07-12 CSB7598 - Jul 12, 16:10 UTCJul 12, 18:15 UTC2h 5m
2026-07-12 CSB7521 - Jul 12, 12:50 UTCJul 12, 13:01 UTC10m
2026-07-12 CSB7521 - Jul 12, 10:50 UTCJul 12, 11:15 UTC25m
2026-07-12 CSB7515 - Jul 12, 05:05 UTCJul 12, 07:10 UTC2h 5m
2026-07-11 CSB7592 SJU → CVG Jul 11, 21:05 UTCJul 12, 00:45 UTC3h 40m
2026-07-11 CSB7505 - Jul 11, 18:30 UTCJul 11, 18:45 UTC15m

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, CSB7505, CSB7521, CSB7510, CSB7715.