Apparatus

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sensors Mode-S transponder

A155A3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1850M · LEARJET 45 · operated by ALPINE PEAK HOLDINGS LLC

Hex
A155A3
Octal
50252643
Decimal
10,573,219
Country
US
Tail
N1850M
Type
LJ45
No current signal · last broadcast 6d ago
Flights observed
118
Distinct callsigns
1
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A155A3.

Country allocation

The ICAO 24-bit address A155A3 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
NJM1850 - 118 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NJM1850 - Jul 26, 20:25 UTCJul 26, 21:25 UTC1h 0m
2026-07-26 NJM1850 - Jul 26, 15:50 UTCJul 26, 16:30 UTC40m
2026-07-26 NJM1850 AGC → MKE Jul 26, 13:50 UTCJul 26, 15:05 UTC1h 15m
2026-07-25 NJM1850 - Jul 25, 21:35 UTCJul 25, 22:45 UTC1h 10m
2026-07-25 NJM1850 ORL → BED Jul 25, 17:50 UTCJul 25, 20:15 UTC2h 25m
2026-07-23 NJM1850 - Jul 23, 19:10 UTCJul 23, 19:35 UTC25m
2026-07-23 NJM1850 - Jul 23, 17:40 UTCJul 23, 18:40 UTC1h 0m
2026-07-23 NJM1850 - Jul 23, 14:15 UTCJul 23, 15:20 UTC1h 5m
2026-07-23 NJM1850 ORL → TPA Jul 23, 13:15 UTCJul 23, 13:35 UTC20m
2026-07-22 NJM1850 - Jul 22, 21:25 UTCJul 22, 22:05 UTC40m
2026-07-22 NJM1850 TUL → APF Jul 22, 18:00 UTCJul 22, 20:20 UTC2h 20m
2026-07-22 NJM1850 - Jul 22, 15:45 UTCJul 22, 17:25 UTC1h 40m
2026-07-15 NJM1850 - Jul 15, 16:20 UTCJul 15, 17:55 UTC1h 35m
2026-07-15 NJM1850 - Jul 15, 13:20 UTCJul 15, 15:40 UTC2h 20m
2026-07-14 NJM1850 - Jul 14, 16:50 UTCJul 14, 19:05 UTC2h 15m
2026-07-12 NJM1850 - Jul 12, 17:25 UTCJul 12, 19:30 UTC2h 5m
2026-07-06 NJM1850 - Jul 6, 16:05 UTCJul 6, 17:10 UTC1h 5m
2026-07-05 NJM1850 - Jul 5, 15:20 UTCJul 5, 16:10 UTC50m
2026-07-05 NJM1850 - Jul 5, 13:00 UTCJul 5, 14:05 UTC1h 5m
2026-07-05 NJM1850 - Jul 5, 10:40 UTCJul 5, 11:30 UTC50m
2026-07-03 NJM1850 - Jul 3, 12:25 UTCJul 3, 13:15 UTC50m
2026-07-02 NJM1850 - Jul 2, 17:00 UTCJul 2, 17:25 UTC25m
2026-07-02 NJM1850 - Jul 2, 15:00 UTCJul 2, 16:15 UTC1h 15m
2026-06-27 NJM1850 - Jun 27, 21:29 UTCJun 27, 21:59 UTC30m
2026-06-27 NJM1850 - Jun 27, 15:10 UTCJun 27, 15:45 UTC35m
2026-06-25 NJM1850 - Jun 25, 18:59 UTCJun 25, 20:19 UTC1h 20m
2026-06-24 NJM1850 - Jun 24, 19:00 UTCJun 24, 20:24 UTC1h 25m
2026-06-21 NJM1850 - Jun 21, 22:49 UTCJun 22, 00:10 UTC1h 20m
2026-06-21 NJM1850 - Jun 21, 19:05 UTCJun 21, 19:39 UTC35m
2026-06-21 NJM1850 - Jun 21, 17:10 UTCJun 21, 18:25 UTC1h 15m
2026-06-20 NJM1850 - Jun 20, 17:39 UTCJun 20, 19:09 UTC1h 30m
2026-06-20 NJM1850 - Jun 20, 14:59 UTCJun 20, 15:44 UTC45m
2026-06-19 NJM1850 - Jun 19, 18:09 UTCJun 19, 18:59 UTC50m
2026-06-19 NJM1850 - Jun 19, 16:29 UTCJun 19, 17:14 UTC45m
2026-06-19 NJM1850 - Jun 19, 13:04 UTCJun 19, 15:34 UTC2h 30m
2026-06-17 NJM1850 - Jun 17, 16:15 UTCJun 17, 17:05 UTC50m
2026-06-17 NJM1850 - Jun 17, 14:40 UTCJun 17, 15:20 UTC40m
2026-06-17 NJM1850 - Jun 17, 13:45 UTCJun 17, 14:05 UTC20m
2026-06-15 NJM1850 - Jun 15, 17:50 UTCJun 15, 20:04 UTC2h 15m
2026-06-15 NJM1850 - Jun 15, 15:40 UTCJun 15, 17:10 UTC1h 30m
2026-06-11 NJM1850 - Jun 11, 17:45 UTCJun 11, 19:35 UTC1h 50m
2026-06-11 NJM1850 - Jun 11, 14:35 UTCJun 11, 17:05 UTC2h 30m
2026-06-11 NJM1850 - Jun 11, 00:15 UTCJun 11, 01:30 UTC1h 15m
2026-06-10 NJM1850 - Jun 10, 19:25 UTCJun 10, 20:40 UTC1h 15m
2026-06-10 NJM1850 - Jun 10, 16:50 UTCJun 10, 18:40 UTC1h 50m
2026-06-09 NJM1850 - Jun 9, 23:20 UTCJun 10, 00:30 UTC1h 10m
2026-06-09 NJM1850 - Jun 9, 13:00 UTCJun 9, 14:05 UTC1h 5m
2026-06-08 NJM1850 - Jun 8, 19:10 UTCJun 8, 20:30 UTC1h 20m
2026-06-07 NJM1850 - Jun 7, 19:40 UTCJun 7, 21:20 UTC1h 40m
2026-06-07 NJM1850 - Jun 7, 17:45 UTCJun 7, 18:35 UTC50m

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 N1850M page for operator, model, and routing details .

Mode-S A155A3 frequently asked

What is Mode-S code A155A3?
A155A3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1850M.
Where is Mode-S A155A3 registered?
Mode-S code A155A3 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 A155A3 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A155A3, octal 50252643, decimal 10,573,219.
What flights does A155A3 operate?
Mode-S A155A3 has broadcast 1 distinct callsign, including NJM1850.