Apparatus

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sensors Mode-S transponder

ACA944

ICAO 24-bit transponder address · allocated to United States

Hex
ACA944
Octal
53124504
Decimal
11,315,524
Country
US
No current signal · last broadcast 2h ago
Flights observed
60
Distinct callsigns
2
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S ACA944.

Country allocation

The ICAO 24-bit address ACA944 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 2 distinct

Callsign Airline Flights Last seen
N915AF - 59 2026-06-29
CSTT724 - 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 N915AF - Jun 29, 23:49 UTCJun 30, 00:00 UTC10m
2026-06-29 N915AF - Jun 29, 22:10 UTCJun 29, 22:24 UTC15m
2026-06-29 N915AF - Jun 29, 19:39 UTCJun 29, 19:49 UTC10m
2026-06-29 N915AF - Jun 29, 18:44 UTCJun 29, 19:00 UTC15m
2026-06-29 N915AF - Jun 29, 17:55 UTCJun 29, 18:05 UTC10m
2026-06-28 N915AF - Jun 28, 18:05 UTCJun 28, 19:49 UTC1h 45m
2026-06-28 N915AF - Jun 28, 16:29 UTCJun 28, 16:55 UTC25m
2026-06-28 N915AF - Jun 28, 14:54 UTCJun 28, 15:49 UTC55m
2026-06-26 N915AF - Jun 26, 19:24 UTCJun 26, 19:55 UTC30m
2026-06-26 N915AF - Jun 26, 17:40 UTCJun 26, 18:24 UTC45m
2026-06-26 N915AF - Jun 26, 16:39 UTCJun 26, 16:49 UTC10m
2026-06-26 N915AF - Jun 26, 14:55 UTCJun 26, 15:29 UTC35m
2026-06-26 N915AF - Jun 26, 00:55 UTCJun 26, 02:05 UTC1h 10m
2026-06-25 N915AF - Jun 25, 21:50 UTCJun 25, 22:14 UTC25m
2026-06-25 N915AF - Jun 25, 19:15 UTCJun 25, 19:54 UTC40m
2026-06-25 N915AF - Jun 25, 14:34 UTCJun 25, 16:29 UTC1h 55m
2026-06-24 N915AF - Jun 24, 23:04 UTCJun 25, 00:49 UTC1h 45m
2026-06-24 N915AF - Jun 24, 20:35 UTCJun 24, 21:50 UTC1h 15m
2026-06-24 N915AF - Jun 24, 18:15 UTCJun 24, 18:55 UTC40m
2026-06-24 N915AF - Jun 24, 16:59 UTCJun 24, 17:40 UTC40m
2026-06-23 N915AF - Jun 23, 22:15 UTCJun 23, 22:49 UTC35m
2026-06-23 N915AF - Jun 23, 21:10 UTCJun 23, 21:24 UTC15m
2026-06-23 N915AF - Jun 23, 19:04 UTCJun 23, 19:59 UTC55m
2026-06-23 N915AF - Jun 23, 13:05 UTCJun 23, 13:15 UTC10m
2026-06-22 N915AF - Jun 22, 17:55 UTCJun 22, 18:09 UTC15m
2026-06-22 N915AF - Jun 22, 14:40 UTCJun 22, 16:34 UTC1h 55m
2026-06-21 N915AF - Jun 21, 14:50 UTCJun 21, 16:39 UTC1h 50m
2026-06-19 N915AF - Jun 19, 16:39 UTCJun 19, 17:09 UTC30m
2026-06-18 N915AF - Jun 18, 18:45 UTCJun 18, 19:15 UTC30m
2026-06-18 N915AF - Jun 18, 17:00 UTCJun 18, 17:25 UTC25m
2026-06-18 N915AF - Jun 18, 16:00 UTCJun 18, 16:20 UTC20m
2026-06-17 N915AF - Jun 17, 21:00 UTCJun 17, 22:10 UTC1h 10m
2026-06-13 N915AF - Jun 13, 22:30 UTCJun 13, 22:40 UTC10m
2026-06-13 N915AF - Jun 13, 21:15 UTCJun 13, 21:55 UTC40m
2026-06-13 N915AF - Jun 13, 18:30 UTCJun 13, 18:55 UTC25m
2026-06-13 N915AF - Jun 13, 16:50 UTCJun 13, 17:30 UTC40m
2026-06-13 N915AF - Jun 13, 13:10 UTCJun 13, 14:00 UTC50m
2026-06-12 N915AF - Jun 12, 20:25 UTCJun 12, 20:50 UTC25m
2026-06-12 N915AF - Jun 12, 19:05 UTCJun 12, 19:50 UTC45m
2026-06-11 N915AF - Jun 11, 23:30 UTCJun 12, 00:35 UTC1h 5m
2026-06-11 N915AF - Jun 11, 21:35 UTCJun 11, 21:55 UTC20m
2026-06-11 N915AF - Jun 11, 20:10 UTCJun 11, 20:50 UTC40m
2026-06-11 N915AF - Jun 11, 17:05 UTCJun 11, 17:20 UTC15m
2026-06-11 N915AF - Jun 11, 12:55 UTCJun 11, 13:05 UTC10m
2026-06-10 N915AF - Jun 10, 19:35 UTCJun 10, 20:45 UTC1h 10m
2026-06-10 N915AF - Jun 10, 19:05 UTCJun 10, 19:30 UTC25m
2026-06-10 N915AF - Jun 10, 01:05 UTCJun 10, 02:15 UTC1h 10m
2026-06-09 N915AF - Jun 9, 23:25 UTCJun 9, 23:45 UTC20m
2026-06-09 N915AF - Jun 9, 21:50 UTCJun 9, 22:35 UTC45m
2026-06-08 N915AF - Jun 8, 23:45 UTCJun 9, 00:05 UTC20m

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.

Mode-S ACA944 frequently asked

What is Mode-S code ACA944?
ACA944 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S ACA944 registered?
Mode-S code ACA944 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 ACA944 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACA944, octal 53124504, decimal 11,315,524.
What flights does ACA944 operate?
Mode-S ACA944 has broadcast 2 distinct callsigns, including N915AF, CSTT724.