Apparatus

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sensors Mode-S transponder

AC17B3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8789T · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
AC17B3
Octal
53013663
Decimal
11,278,259
Country
US
Tail
N8789T
Type
C172
No current signal · last broadcast 13h ago
Flights observed
51
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S AC17B3.

Country allocation

The ICAO 24-bit address AC17B3 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 1 distinct

Callsign Airline Flights Last seen
AUB157 - 51 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AUB157 AUO → AUO May 29, 18:45 UTCMay 29, 20:00 UTC1h 15m
2026-05-29 AUB157 AUO → AUO May 29, 12:55 UTCMay 29, 14:30 UTC1h 35m
2026-05-28 AUB157 AUO → AUO May 28, 20:05 UTCMay 28, 20:10 UTC5m
2026-05-28 AUB157 - May 28, 18:45 UTCMay 28, 19:00 UTC15m
2026-05-28 AUB157 AUO → AUO May 28, 15:25 UTCMay 28, 16:20 UTC55m
2026-05-27 AUB157 - May 27, 15:55 UTCMay 27, 17:10 UTC1h 15m
2026-05-27 AUB157 - May 27, 14:00 UTCMay 27, 14:55 UTC55m
2026-05-22 AUB157 AUO → AUO May 22, 16:30 UTCMay 22, 17:05 UTC35m
2026-05-21 AUB157 AUO → AUO May 21, 19:10 UTCMay 21, 20:30 UTC1h 20m
2026-05-20 AUB157 AUO → AUO May 20, 21:40 UTCMay 20, 23:10 UTC1h 30m
2026-05-19 AUB157 AUO → AUO May 19, 21:40 UTCMay 19, 23:25 UTC1h 45m
2026-05-01 AUB157 AUO → AUO May 1, 17:10 UTCMay 1, 18:05 UTC55m
2026-04-29 AUB157 AUO → AUO Apr 29, 23:40 UTCApr 30, 00:35 UTC55m
2026-04-27 AUB157 AUO → AUO Apr 27, 21:35 UTCApr 27, 22:50 UTC1h 15m
2026-04-27 AUB157 AUO → AUO Apr 27, 12:40 UTCApr 27, 13:40 UTC1h 0m
2026-04-24 AUB157 AUO → AUO Apr 24, 20:45 UTCApr 24, 21:35 UTC50m
2026-04-24 AUB157 AUO → AUO Apr 24, 17:10 UTCApr 24, 18:25 UTC1h 15m
2026-04-24 AUB157 AUO → AUO Apr 24, 12:35 UTCApr 24, 13:50 UTC1h 15m
2026-04-23 AUB157 AUO → AUO Apr 23, 21:55 UTCApr 23, 23:05 UTC1h 10m
2026-04-23 AUB157 AUO → AUO Apr 23, 18:40 UTCApr 23, 20:05 UTC1h 25m
2026-04-23 AUB157 AUO → AUO Apr 23, 15:15 UTCApr 23, 16:20 UTC1h 5m
2026-04-23 AUB157 - Apr 23, 00:00 UTCApr 23, 01:15 UTC1h 15m
2026-04-22 AUB157 - Apr 22, 22:30 UTCApr 22, 23:30 UTC1h 0m
2026-04-22 AUB157 - Apr 22, 19:25 UTCApr 22, 20:45 UTC1h 20m
2026-04-22 AUB157 - Apr 22, 18:35 UTCApr 22, 18:50 UTC15m
2026-04-22 AUB157 - Apr 22, 00:30 UTCApr 22, 01:50 UTC1h 20m
2026-04-21 AUB157 AUO → PDK Apr 21, 22:25 UTCApr 21, 23:50 UTC1h 25m
2026-04-21 AUB157 AUO → AUO Apr 21, 17:45 UTCApr 21, 19:00 UTC1h 15m
2026-04-21 AUB157 AUO → AUO Apr 21, 12:55 UTCApr 21, 13:30 UTC35m
2026-04-20 AUB157 AUO → AUO Apr 20, 23:35 UTCApr 21, 00:45 UTC1h 10m
2026-04-20 AUB157 AUO → AUO Apr 20, 20:40 UTCApr 20, 21:35 UTC55m
2026-04-20 AUB157 - Apr 20, 15:10 UTCApr 20, 16:20 UTC1h 10m
2026-04-20 AUB157 - Apr 20, 13:30 UTCApr 20, 14:30 UTC1h 0m
2026-04-18 AUB157 AUO → AUO Apr 18, 19:00 UTCApr 18, 20:15 UTC1h 15m
2026-04-18 AUB157 AUO → AUO Apr 18, 13:20 UTCApr 18, 14:20 UTC1h 0m
2026-04-17 AUB157 - Apr 17, 15:20 UTCApr 17, 16:05 UTC45m
2026-04-17 AUB157 - Apr 17, 13:40 UTCApr 17, 14:40 UTC1h 0m
2026-04-16 AUB157 - Apr 16, 21:39 UTCApr 16, 21:55 UTC15m
2026-04-16 AUB157 - Apr 16, 20:35 UTCApr 16, 21:05 UTC30m
2026-04-16 AUB157 AUO → AUO Apr 16, 13:50 UTCApr 16, 15:10 UTC1h 20m
2026-04-16 AUB157 - Apr 16, 01:10 UTCApr 16, 01:55 UTC45m
2026-04-15 AUB157 AUO → AUO Apr 15, 19:30 UTCApr 15, 20:40 UTC1h 10m
2026-04-15 AUB157 - Apr 15, 14:40 UTCApr 15, 14:50 UTC9m
2026-04-14 AUB157 - Apr 14, 14:50 UTCApr 14, 15:05 UTC15m
2026-04-14 AUB157 - Apr 14, 13:55 UTCApr 14, 14:45 UTC50m
2026-04-13 AUB157 - Apr 13, 21:50 UTCApr 13, 22:00 UTC10m
2026-04-13 AUB157 - Apr 13, 20:30 UTCApr 13, 20:45 UTC15m
2026-04-13 AUB157 AUO → AUO Apr 13, 17:35 UTCApr 13, 17:55 UTC20m
2026-04-13 AUB157 - Apr 13, 16:15 UTCApr 13, 16:35 UTC20m
2026-04-13 AUB157 - Apr 13, 15:55 UTCApr 13, 16:35 UTC40m

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 N8789T page for operator, model, and routing details .

Mode-S AC17B3 frequently asked

What is Mode-S code AC17B3?
AC17B3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8789T.
Where is Mode-S AC17B3 registered?
Mode-S code AC17B3 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 AC17B3 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC17B3, octal 53013663, decimal 11,278,259.
What flights does AC17B3 operate?
Mode-S AC17B3 has broadcast 1 distinct callsign, including AUB157.