Apparatus

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sensors Mode-S transponder

ACA529

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9137M · CESSNA 182 Skylane · operated by RIVERSIDE PILOTS INC

Hex
ACA529
Octal
53122451
Decimal
11,314,473
Country
US
Tail
N9137M
Type
C182
No current signal · last broadcast 1d ago
Flights observed
138
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ACA529.

Country allocation

The ICAO 24-bit address ACA529 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
N9137M - 138 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N9137M - Jul 17, 03:05 UTCJul 17, 04:29 UTC1h 25m
2026-07-17 N9137M RAL → CLD Jul 17, 02:05 UTCJul 17, 02:54 UTC50m
2026-07-16 N9137M RAL → RAL Jul 16, 23:05 UTCJul 17, 00:55 UTC1h 50m
2026-07-16 N9137M - Jul 16, 20:35 UTCJul 16, 21:00 UTC25m
2026-07-16 N9137M - Jul 16, 15:40 UTCJul 16, 16:09 UTC30m
2026-07-16 N9137M RAL → SBD Jul 16, 14:55 UTCJul 16, 15:10 UTC15m
2026-07-16 N9137M - Jul 16, 03:25 UTCJul 16, 03:35 UTC10m
2026-07-15 N9137M - Jul 15, 22:30 UTCJul 15, 23:40 UTC1h 10m
2026-07-15 N9137M - Jul 15, 20:35 UTCJul 15, 21:10 UTC35m
2026-07-15 N9137M - Jul 15, 18:15 UTCJul 15, 18:30 UTC15m
2026-07-15 N9137M - Jul 15, 01:00 UTCJul 15, 01:15 UTC15m
2026-07-15 N9137M RAL → RAL Jul 15, 00:15 UTCJul 15, 00:50 UTC35m
2026-07-11 N9137M - Jul 11, 20:45 UTCJul 11, 21:00 UTC15m
2026-07-11 N9137M - Jul 11, 18:05 UTCJul 11, 18:25 UTC20m
2026-07-11 N9137M SMO → RAL Jul 11, 06:01 UTCJul 11, 07:05 UTC1h 5m
2026-07-11 N9137M RAL → SMO Jul 11, 00:55 UTCJul 11, 02:20 UTC1h 25m
2026-07-10 N9137M - Jul 10, 19:25 UTCJul 10, 20:25 UTC1h 0m
2026-07-10 N9137M - Jul 10, 17:05 UTCJul 10, 17:50 UTC45m
2026-07-10 N9137M RAL → RAL Jul 10, 04:15 UTCJul 10, 04:20 UTC5m
2026-07-10 N9137M RAL → RAL Jul 10, 04:00 UTCJul 10, 04:10 UTC10m
2026-07-05 N9137M - Jul 5, 21:15 UTCJul 5, 21:30 UTC15m
2026-07-05 N9137M - Jul 5, 16:25 UTCJul 5, 16:50 UTC25m
2026-07-05 N9137M - Jul 5, 03:40 UTCJul 5, 04:50 UTC1h 10m
2026-07-04 N9137M - Jul 4, 22:30 UTCJul 4, 22:45 UTC15m
2026-07-03 N9137M - Jul 3, 20:40 UTCJul 3, 21:45 UTC1h 5m
2026-07-03 N9137M RAL → SBA Jul 3, 17:05 UTCJul 3, 18:10 UTC1h 5m
2026-07-03 N9137M - Jul 3, 01:05 UTCJul 3, 01:20 UTC15m
2026-07-02 N9137M - Jul 2, 23:05 UTCJul 2, 23:20 UTC15m
2026-07-02 N9137M - Jul 2, 00:50 UTCJul 2, 01:20 UTC30m
2026-07-01 N9137M - Jul 1, 23:55 UTCJul 2, 00:10 UTC15m
2026-07-01 N9137M - Jul 1, 18:55 UTCJul 1, 19:45 UTC50m
2026-07-01 N9137M - Jul 1, 16:45 UTCJul 1, 17:35 UTC50m
2026-06-29 N9137M RAL → RAL Jun 29, 21:44 UTCJun 29, 22:35 UTC50m
2026-06-26 N9137M RAL → RAL Jun 26, 22:55 UTCJun 27, 00:05 UTC1h 10m
2026-06-26 N9137M - Jun 26, 01:24 UTCJun 26, 01:54 UTC30m
2026-06-25 N9137M RAL → CLD Jun 25, 21:05 UTCJun 25, 21:35 UTC30m
2026-06-25 N9137M SBA → RAL Jun 25, 03:29 UTCJun 25, 04:40 UTC1h 10m
2026-06-24 N9137M SQL → SBA Jun 24, 23:04 UTCJun 25, 00:55 UTC1h 50m
2026-06-24 N9137M RAL → SQL Jun 24, 17:25 UTCJun 24, 19:55 UTC2h 30m
2026-06-24 N9137M RAL → RAL Jun 24, 04:20 UTCJun 24, 04:34 UTC15m
2026-06-23 N9137M - Jun 23, 19:50 UTCJun 23, 20:29 UTC40m
2026-06-23 N9137M RAL → CLD Jun 23, 17:30 UTCJun 23, 18:14 UTC45m
2026-06-19 N9137M - Jun 19, 19:25 UTCJun 19, 20:14 UTC50m
2026-06-19 N9137M - Jun 19, 17:39 UTCJun 19, 18:30 UTC50m
2026-06-19 N9137M RBK → RAL Jun 19, 03:15 UTCJun 19, 03:34 UTC20m
2026-06-19 N9137M RAL → RBK Jun 19, 01:24 UTCJun 19, 01:54 UTC30m
2026-06-12 N9137M SMX → RAL Jun 12, 21:10 UTCJun 12, 22:40 UTC1h 30m
2026-06-12 N9137M RAL → SMX Jun 12, 17:35 UTCJun 12, 19:00 UTC1h 25m
2026-06-11 N9137M RAL → RAL Jun 11, 00:45 UTCJun 11, 01:45 UTC1h 0m
2026-06-10 N9137M ONT → RAL Jun 10, 02:30 UTCJun 10, 02:40 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.

Prefer a tail-number view? See the N9137M page for operator, model, and routing details .

Mode-S ACA529 frequently asked

What is Mode-S code ACA529?
ACA529 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9137M.
Where is Mode-S ACA529 registered?
Mode-S code ACA529 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 ACA529 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACA529, octal 53122451, decimal 11,314,473.
What flights does ACA529 operate?
Mode-S ACA529 has broadcast 1 distinct callsign, including N9137M.