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sensors Mode-S transponder

ACB3DE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9176H · CESSNA 172 Skyhawk · operated by SKY WALKER FLIGHT SCHOOL LLC

Hex
ACB3DE
Octal
53131736
Decimal
11,318,238
Country
US
Tail
N9176H
Type
C172
No current signal · last broadcast 8d ago
Flights observed
169
Distinct callsigns
1
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S ACB3DE.

Country allocation

The ICAO 24-bit address ACB3DE 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
N9176H - 167 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N9176H - Jul 26, 20:25 UTCJul 26, 21:00 UTC35m
2026-07-26 N9176H - Jul 26, 19:55 UTCJul 26, 20:20 UTC25m
2026-07-26 N9176H - Jul 26, 02:05 UTCJul 26, 03:45 UTC1h 40m
2026-07-25 N9176H ADG → ADG Jul 25, 22:55 UTCJul 25, 23:20 UTC25m
2026-07-25 N9176H - Jul 25, 22:20 UTCJul 25, 22:50 UTC30m
2026-07-25 N9176H - Jul 25, 21:55 UTCJul 25, 22:15 UTC20m
2026-07-25 N9176H - Jul 25, 17:30 UTCJul 25, 18:30 UTC1h 0m
2026-07-25 N9176H ADG → ADG Jul 25, 16:20 UTCJul 25, 16:30 UTC10m
2026-07-25 N9176H ADG → ADG Jul 25, 15:50 UTCJul 25, 16:15 UTC25m
2026-07-25 N9176H ADG → ADG Jul 25, 15:40 UTCJul 25, 15:45 UTC5m
2026-07-24 N9176H - Jul 24, 22:45 UTCJul 24, 23:35 UTC50m
2026-07-23 N9176H ADG → ADG Jul 23, 23:05 UTCJul 23, 23:15 UTC10m
2026-07-23 N9176H - Jul 23, 22:35 UTCJul 23, 22:55 UTC20m
2026-07-23 N9176H ADG → ADG Jul 23, 15:25 UTCJul 23, 15:45 UTC20m
2026-07-23 N9176H ADG → ADG Jul 23, 15:10 UTCJul 23, 15:20 UTC10m
2026-07-22 N9176H - Jul 22, 19:35 UTCJul 22, 20:25 UTC50m
2026-07-22 N9176H - Jul 22, 15:30 UTCJul 22, 16:15 UTC45m
2026-07-22 N9176H ADG → ADG Jul 22, 12:55 UTCJul 22, 13:35 UTC40m
2026-07-22 N9176H ADG → ADG Jul 22, 12:30 UTCJul 22, 12:45 UTC15m
2026-07-21 N9176H - Jul 21, 16:25 UTCJul 21, 17:30 UTC1h 5m
2026-07-21 N9176H ADG → ADG Jul 21, 01:55 UTCJul 21, 02:25 UTC30m
2026-07-16 N9176H - Jul 16, 02:45 UTCJul 16, 03:55 UTC1h 10m
2026-07-16 N9176H - Jul 16, 01:20 UTCJul 16, 01:50 UTC30m
2026-07-14 N9176H ADG → ADG Jul 14, 13:20 UTCJul 14, 13:35 UTC15m
2026-07-14 N9176H ADG → ADG Jul 14, 13:05 UTCJul 14, 13:15 UTC10m
2026-07-14 N9176H - Jul 14, 12:25 UTCJul 14, 13:00 UTC35m
2026-07-13 N9176H - Jul 13, 22:40 UTCJul 13, 23:35 UTC55m
2026-07-13 N9176H - Jul 13, 12:45 UTCJul 13, 13:40 UTC55m
2026-07-12 N9176H ADG → ADG Jul 12, 18:50 UTCJul 12, 19:15 UTC25m
2026-07-12 N9176H - Jul 12, 13:25 UTCJul 12, 13:35 UTC10m
2026-07-11 N9176H - Jul 11, 14:55 UTCJul 11, 15:45 UTC50m
2026-07-09 N9176H - Jul 9, 14:40 UTCJul 9, 15:00 UTC20m
2026-07-08 N9176H - Jul 8, 21:20 UTCJul 8, 21:45 UTC25m
2026-07-08 N9176H - Jul 8, 20:00 UTCJul 8, 20:15 UTC15m
2026-07-08 N9176H - Jul 8, 14:40 UTCJul 8, 15:45 UTC1h 5m
2026-07-07 N9176H - Jul 7, 21:40 UTCJul 7, 22:30 UTC50m
2026-07-07 N9176H - Jul 7, 14:40 UTCJul 7, 15:25 UTC45m
2026-07-07 N9176H - Jul 7, 12:50 UTCJul 7, 13:55 UTC1h 5m
2026-07-06 N9176H ADG → ADG Jul 6, 22:40 UTCJul 6, 23:35 UTC55m
2026-07-05 N9176H ADG → ADG Jul 5, 20:25 UTCJul 5, 20:45 UTC20m
2026-07-03 N9176H - Jul 3, 15:30 UTCJul 3, 15:40 UTC10m
2026-07-03 N9176H - Jul 3, 14:35 UTCJul 3, 15:25 UTC50m
2026-07-03 N9176H - Jul 3, 12:35 UTCJul 3, 13:40 UTC1h 5m
2026-07-02 N9176H - Jul 2, 13:30 UTCJul 2, 14:10 UTC40m
2026-07-01 N9176H - Jul 1, 16:50 UTCJul 1, 17:05 UTC15m
2026-07-01 N9176H - Jul 1, 15:15 UTCJul 1, 15:40 UTC25m
2026-07-01 N9176H - Jul 1, 13:50 UTCJul 1, 14:35 UTC45m
2026-06-30 N9176H - Jun 30, 22:30 UTCJun 30, 23:05 UTC35m
2026-06-29 N9176H ADG → ADG Jun 29, 22:59 UTCJun 29, 23:29 UTC30m
2026-06-29 N9176H - Jun 29, 16:15 UTCJun 29, 17:10 UTC55m

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 N9176H page for operator, model, and routing details .

Mode-S ACB3DE frequently asked

What is Mode-S code ACB3DE?
ACB3DE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9176H.
Where is Mode-S ACB3DE registered?
Mode-S code ACB3DE 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 ACB3DE broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACB3DE, octal 53131736, decimal 11,318,238.
What flights does ACB3DE operate?
Mode-S ACB3DE has broadcast 1 distinct callsign, including N9176H.