Apparatus

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sensors Mode-S transponder

A0AB99

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N142RD · operated by S-TURNS LLC

Hex
A0AB99
Octal
50125631
Decimal
10,529,689
Country
US
Tail
N142RD
Type
S22T
No current signal · last broadcast 1d ago
Flights observed
84
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A0AB99.

Country allocation

The ICAO 24-bit address A0AB99 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
N142RD - 84 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N142RD - Jul 12, 23:20 UTCJul 12, 23:55 UTC35m
2026-07-12 N142RD - Jul 12, 18:55 UTCJul 12, 19:40 UTC45m
2026-07-07 N142RD - Jul 7, 14:25 UTCJul 7, 15:25 UTC1h 0m
2026-07-06 N142RD SRQ → SRQ Jul 6, 22:55 UTCJul 6, 23:20 UTC25m
2026-07-05 N142RD SRQ → SRQ Jul 5, 23:20 UTCJul 6, 00:30 UTC1h 10m
2026-07-01 N142RD ORL → SRQ Jul 1, 23:00 UTCJul 1, 23:40 UTC40m
2026-07-01 N142RD ORL → ORL Jul 1, 15:40 UTCJul 1, 17:05 UTC1h 25m
2026-07-01 N142RD - Jul 1, 11:20 UTCJul 1, 12:00 UTC40m
2026-06-30 N142RD ORL → SRQ Jun 30, 22:40 UTCJun 30, 23:25 UTC45m
2026-06-30 N142RD ORL → ORL Jun 30, 15:50 UTCJun 30, 16:50 UTC1h 0m
2026-06-30 N142RD - Jun 30, 11:30 UTCJun 30, 12:10 UTC40m
2026-06-29 N142RD ORL → SRQ Jun 29, 22:10 UTCJun 29, 22:49 UTC40m
2026-06-29 N142RD - Jun 29, 15:04 UTCJun 29, 16:04 UTC1h 0m
2026-06-26 N142RD ORL → SRQ Jun 26, 18:09 UTCJun 26, 18:44 UTC35m
2026-06-26 N142RD - Jun 26, 15:05 UTCJun 26, 15:49 UTC45m
2026-06-25 N142RD - Jun 25, 22:29 UTCJun 25, 23:14 UTC45m
2026-06-25 N142RD - Jun 25, 19:54 UTCJun 25, 20:39 UTC45m
2026-06-25 N142RD - Jun 25, 18:10 UTCJun 25, 18:55 UTC45m
2026-06-23 N142RD - Jun 23, 15:34 UTCJun 23, 16:14 UTC40m
2026-06-23 N142RD - Jun 23, 14:10 UTCJun 23, 14:49 UTC40m
2026-06-23 N142RD - Jun 23, 12:35 UTCJun 23, 13:19 UTC45m
2026-06-22 N142RD MLB → SRQ Jun 22, 21:30 UTCJun 22, 22:19 UTC50m
2026-06-22 N142RD - Jun 22, 16:20 UTCJun 22, 17:04 UTC45m
2026-06-19 N142RD - Jun 19, 19:49 UTCJun 19, 20:55 UTC1h 5m
2026-06-19 N142RD - Jun 19, 15:44 UTCJun 19, 16:39 UTC55m
2026-06-15 N142RD - Jun 15, 22:25 UTCJun 16, 01:15 UTC2h 50m
2026-06-15 N142RD - Jun 15, 20:50 UTCJun 15, 21:20 UTC30m
2026-06-15 N142RD - Jun 15, 18:35 UTCJun 15, 19:35 UTC1h 0m
2026-06-15 N142RD - Jun 15, 01:35 UTCJun 15, 02:10 UTC35m
2026-06-14 N142RD - Jun 14, 23:20 UTCJun 14, 23:29 UTC10m
2026-06-14 N142RD - Jun 14, 21:05 UTCJun 14, 21:40 UTC35m
2026-06-14 N142RD - Jun 14, 18:20 UTCJun 14, 20:30 UTC2h 10m
2026-06-12 N142RD - Jun 12, 23:30 UTCJun 13, 00:00 UTC30m
2026-06-12 N142RD - Jun 12, 16:10 UTCJun 12, 19:05 UTC2h 55m
2026-06-11 N142RD - Jun 11, 23:50 UTCJun 11, 23:55 UTC5m
2026-06-11 N142RD - Jun 11, 20:30 UTCJun 11, 21:15 UTC45m
2026-06-10 N142RD - Jun 10, 21:20 UTCJun 10, 22:10 UTC50m
2026-06-10 N142RD - Jun 10, 19:25 UTCJun 10, 20:40 UTC1h 15m
2026-06-03 N142RD APC → BFI Jun 3, 22:45 UTCJun 4, 02:20 UTC3h 35m
2026-06-03 N142RD - Jun 3, 17:30 UTCJun 3, 19:55 UTC2h 25m
2026-06-03 N142RD SMO → CLD Jun 3, 00:20 UTCJun 3, 01:00 UTC40m
2026-06-02 N142RD - Jun 2, 17:40 UTCJun 2, 18:25 UTC45m
2026-06-01 N142RD - Jun 1, 00:20 UTCJun 1, 00:35 UTC15m
2026-05-31 N142RD - May 31, 22:20 UTCMay 31, 23:45 UTC1h 25m
2026-05-31 N142RD - May 31, 21:10 UTCMay 31, 21:45 UTC35m
2026-05-31 N142RD - May 31, 17:15 UTCMay 31, 17:50 UTC35m
2026-05-30 N142RD - May 30, 19:10 UTCMay 30, 20:15 UTC1h 5m
2026-05-30 N142RD - May 30, 17:50 UTCMay 30, 18:30 UTC40m
2026-05-30 N142RD - May 30, 12:45 UTCMay 30, 16:05 UTC3h 20m
2026-05-27 N142RD - May 27, 21:25 UTCMay 27, 22:25 UTC1h 0m

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 N142RD page for operator, model, and routing details .

Mode-S A0AB99 frequently asked

What is Mode-S code A0AB99?
A0AB99 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N142RD.
Where is Mode-S A0AB99 registered?
Mode-S code A0AB99 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 A0AB99 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 A0AB99, octal 50125631, decimal 10,529,689.
What flights does A0AB99 operate?
Mode-S A0AB99 has broadcast 1 distinct callsign, including N142RD.