Apparatus

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sensors Mode-S transponder

AC5BA4

ICAO 24-bit transponder address · allocated to United States

Hex
AC5BA4
Octal
53055644
Decimal
11,295,652
Country
US
No current signal · last broadcast 4h ago
Flights observed
42
Distinct callsigns
2
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S AC5BA4.

Country allocation

The ICAO 24-bit address AC5BA4 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
N896AF - 41 2026-06-28
CSTT709 - 1 2026-05-04

Recent flights last 42

DateFlightRouteTakeoffLandingDuration
2026-06-28 N896AF - Jun 28, 20:54 UTCJun 28, 21:04 UTC10m
2026-06-28 N896AF - Jun 28, 17:00 UTCJun 28, 19:49 UTC2h 50m
2026-06-28 N896AF - Jun 28, 15:40 UTCJun 28, 15:49 UTC10m
2026-06-28 N896AF - Jun 28, 14:09 UTCJun 28, 14:19 UTC10m
2026-06-27 N896AF - Jun 27, 23:29 UTCJun 27, 23:55 UTC25m
2026-06-27 N896AF - Jun 27, 19:29 UTCJun 27, 19:39 UTC10m
2026-06-27 N896AF - Jun 27, 17:29 UTCJun 27, 17:49 UTC20m
2026-06-27 N896AF - Jun 27, 15:49 UTCJun 27, 16:04 UTC15m
2026-06-27 N896AF - Jun 27, 01:09 UTCJun 27, 03:40 UTC2h 30m
2026-06-26 N896AF - Jun 26, 18:34 UTCJun 26, 20:04 UTC1h 30m
2026-06-26 N896AF - Jun 26, 00:24 UTCJun 26, 00:39 UTC15m
2026-06-25 N896AF - Jun 25, 19:59 UTCJun 25, 20:14 UTC15m
2026-06-25 N896AF - Jun 25, 17:44 UTCJun 25, 18:45 UTC1h 0m
2026-06-25 N896AF - Jun 25, 13:55 UTCJun 25, 15:29 UTC1h 35m
2026-06-24 N896AF - Jun 24, 21:09 UTCJun 24, 23:29 UTC2h 20m
2026-06-24 N896AF - Jun 24, 17:50 UTCJun 24, 19:24 UTC1h 35m
2026-06-24 N896AF - Jun 24, 00:09 UTCJun 24, 00:49 UTC40m
2026-06-23 N896AF - Jun 23, 23:10 UTCJun 23, 23:34 UTC25m
2026-06-23 N896AF - Jun 23, 17:15 UTCJun 23, 18:45 UTC1h 30m
2026-06-23 N896AF - Jun 23, 15:19 UTCJun 23, 15:50 UTC30m
2026-06-23 N896AF - Jun 23, 02:34 UTCJun 23, 04:14 UTC1h 40m
2026-06-23 N896AF - Jun 23, 01:10 UTCJun 23, 01:30 UTC20m
2026-06-22 N896AF - Jun 22, 23:14 UTCJun 23, 00:35 UTC1h 20m
2026-06-17 N896AF - Jun 17, 22:15 UTCJun 18, 00:00 UTC1h 45m
2026-06-17 N896AF - Jun 17, 01:15 UTCJun 17, 01:35 UTC20m
2026-06-17 N896AF - Jun 17, 00:15 UTCJun 17, 00:40 UTC25m
2026-06-14 N896AF - Jun 14, 17:25 UTCJun 14, 17:40 UTC15m
2026-06-14 N896AF - Jun 14, 03:55 UTCJun 14, 04:30 UTC35m
2026-06-14 N896AF - Jun 14, 02:10 UTCJun 14, 03:05 UTC55m
2026-06-13 N896AF - Jun 13, 21:25 UTCJun 13, 21:50 UTC25m
2026-06-13 N896AF - Jun 13, 20:00 UTCJun 13, 20:25 UTC25m
2026-06-13 N896AF - Jun 13, 14:25 UTCJun 13, 15:05 UTC40m
2026-06-12 N896AF - Jun 12, 22:30 UTCJun 12, 22:55 UTC25m
2026-06-12 N896AF - Jun 12, 19:55 UTCJun 12, 20:05 UTC10m
2026-06-12 N896AF - Jun 12, 15:10 UTCJun 12, 15:25 UTC15m
2026-06-11 N896AF - Jun 11, 19:35 UTCJun 11, 20:00 UTC25m
2026-06-10 N896AF - Jun 10, 18:25 UTCJun 10, 18:55 UTC30m
2026-06-09 N896AF - Jun 9, 22:05 UTCJun 9, 23:20 UTC1h 15m
2026-06-09 N896AF - Jun 9, 19:20 UTCJun 9, 20:25 UTC1h 5m
2026-06-08 N896AF - Jun 8, 20:10 UTCJun 8, 21:40 UTC1h 30m
2026-05-28 N896AF - May 28, 20:05 UTCMay 28, 22:25 UTC2h 20m
2026-05-04 CSTT709 - May 4, 20:30 UTCMay 4, 20:40 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.

Mode-S AC5BA4 frequently asked

What is Mode-S code AC5BA4?
AC5BA4 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S AC5BA4 registered?
Mode-S code AC5BA4 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 AC5BA4 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5BA4, octal 53055644, decimal 11,295,652.
What flights does AC5BA4 operate?
Mode-S AC5BA4 has broadcast 2 distinct callsigns, including N896AF, CSTT709.