Apparatus

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sensors Mode-S transponder

ACABC1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9151H · CESSNA 172 Skyhawk · operated by FIRST FLIGHT CORP

Hex
ACABC1
Octal
53125701
Decimal
11,316,161
Country
US
Tail
N9151H
Type
C172
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
311
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S ACABC1.

Country allocation

The ICAO 24-bit address ACABC1 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
N9151H - 311 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N9151H - Jul 26, 22:00 UTCJul 26, 22:15 UTC15m
2026-07-26 N9151H SDM → SDM Jul 26, 19:40 UTCJul 26, 20:20 UTC40m
2026-07-26 N9151H SDM → SDM Jul 26, 17:25 UTCJul 26, 18:45 UTC1h 20m
2026-07-26 N9151H SDM → SDM Jul 26, 15:35 UTCJul 26, 16:25 UTC50m
2026-07-25 N9151H - Jul 25, 23:45 UTCJul 26, 00:15 UTC30m
2026-07-25 N9151H - Jul 25, 21:50 UTCJul 25, 22:30 UTC40m
2026-07-25 N9151H SDM → SDM Jul 25, 19:45 UTCJul 25, 20:40 UTC55m
2026-07-25 N9151H SDM → SDM Jul 25, 17:30 UTCJul 25, 18:40 UTC1h 10m
2026-07-25 N9151H - Jul 25, 02:35 UTCJul 25, 03:20 UTC45m
2026-07-25 N9151H - Jul 25, 00:35 UTCJul 25, 01:45 UTC1h 10m
2026-07-24 N9151H - Jul 24, 23:00 UTCJul 24, 23:45 UTC45m
2026-07-24 N9151H SDM → AVX Jul 24, 21:10 UTCJul 24, 22:15 UTC1h 5m
2026-07-24 N9151H SDM → SDM Jul 24, 19:45 UTCJul 24, 20:30 UTC45m
2026-07-23 N9151H - Jul 23, 22:15 UTCJul 24, 00:25 UTC2h 10m
2026-07-23 N9151H - Jul 23, 18:55 UTCJul 23, 21:05 UTC2h 10m
2026-07-23 N9151H SDM → SDM Jul 23, 16:45 UTCJul 23, 17:10 UTC25m
2026-07-22 N9151H SDM → SDM Jul 22, 23:50 UTCJul 23, 01:05 UTC1h 15m
2026-07-22 N9151H SDM → SDM Jul 22, 21:55 UTCJul 22, 22:55 UTC1h 0m
2026-07-22 N9151H - Jul 22, 20:00 UTCJul 22, 20:40 UTC40m
2026-07-22 N9151H - Jul 22, 17:50 UTCJul 22, 18:35 UTC45m
2026-07-22 N9151H SDM → SDM Jul 22, 00:35 UTCJul 22, 01:45 UTC1h 10m
2026-07-21 N9151H - Jul 21, 20:50 UTCJul 21, 23:50 UTC3h 0m
2026-07-21 N9151H - Jul 21, 17:35 UTCJul 21, 19:10 UTC1h 35m
2026-07-21 N9151H SDM → SDM Jul 21, 01:55 UTCJul 21, 02:50 UTC55m
2026-07-21 N9151H SDM → SDM Jul 21, 00:00 UTCJul 21, 00:35 UTC35m
2026-07-20 N9151H - Jul 20, 22:05 UTCJul 20, 22:50 UTC45m
2026-07-20 N9151H - Jul 20, 18:05 UTCJul 20, 19:50 UTC1h 45m
2026-07-20 N9151H - Jul 20, 16:30 UTCJul 20, 17:20 UTC50m
2026-07-19 N9151H - Jul 19, 01:25 UTCJul 19, 02:05 UTC40m
2026-07-18 N9151H - Jul 18, 21:40 UTCJul 18, 22:10 UTC30m
2026-07-18 N9151H SDM → SDM Jul 18, 19:45 UTCJul 18, 20:35 UTC50m
2026-07-18 N9151H SDM → SDM Jul 18, 17:40 UTCJul 18, 18:20 UTC40m
2026-07-18 N9151H - Jul 18, 01:25 UTCJul 18, 02:00 UTC35m
2026-07-17 N9151H - Jul 17, 23:50 UTCJul 18, 00:35 UTC45m
2026-07-17 N9151H SDM → SDM Jul 17, 22:05 UTCJul 17, 22:45 UTC40m
2026-07-17 N9151H SDM → SDM Jul 17, 18:10 UTCJul 17, 18:55 UTC45m
2026-07-17 N9151H - Jul 17, 02:05 UTCJul 17, 02:54 UTC50m
2026-07-16 N9151H - Jul 16, 23:49 UTCJul 17, 00:40 UTC50m
2026-07-16 N9151H - Jul 16, 22:00 UTCJul 16, 22:49 UTC50m
2026-07-16 N9151H - Jul 16, 20:25 UTCJul 16, 20:49 UTC25m
2026-07-16 N9151H - Jul 16, 17:49 UTCJul 16, 18:44 UTC55m
2026-07-15 N9151H RBK → SDM Jul 15, 22:25 UTCJul 15, 23:20 UTC55m
2026-07-15 N9151H - Jul 15, 20:05 UTCJul 15, 21:45 UTC1h 40m
2026-07-15 N9151H SDM → SDM Jul 15, 15:35 UTCJul 15, 16:10 UTC35m
2026-07-13 N9151H SDM → SDM Jul 13, 18:45 UTCJul 13, 18:55 UTC10m
2026-07-12 N9151H - Jul 12, 21:10 UTCJul 12, 23:10 UTC2h 0m
2026-07-12 N9151H - Jul 12, 19:25 UTCJul 12, 20:01 UTC35m
2026-07-12 N9151H - Jul 12, 02:20 UTCJul 12, 03:15 UTC55m
2026-07-11 N9151H - Jul 11, 23:45 UTCJul 12, 00:50 UTC1h 5m
2026-07-11 N9151H SDM → SDM Jul 11, 21:25 UTCJul 11, 22:20 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 N9151H page for operator, model, and routing details .

Mode-S ACABC1 frequently asked

What is Mode-S code ACABC1?
ACABC1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9151H.
Where is Mode-S ACABC1 registered?
Mode-S code ACABC1 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 ACABC1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACABC1, octal 53125701, decimal 11,316,161.
What flights does ACABC1 operate?
Mode-S ACABC1 has broadcast 1 distinct callsign, including N9151H.