Apparatus

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sensors Mode-S transponder

A35843

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N31412 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A35843
Octal
50654103
Decimal
10,704,963
Country
US
Tail
N31412
Type
B739
No current signal · last broadcast 7h ago
Flights observed
394
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A35843.

Country allocation

The ICAO 24-bit address A35843 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 20 distinct

Callsign Airline Flights Last seen
UAL1345 - 18 2026-07-03
UAL1752 - 15 2026-07-03
UAL2406 - 14 2026-07-01
UAL2863 - 11 2026-07-09
UAL2310 - 11 2026-07-01
UAL2662 United Airlines 10 2026-06-12
UAL1148 - 10 2026-07-09
UAL496 - 9 2026-06-28
UAL1361 - 9 2026-07-09
UAL740 - 8 2026-07-06
UAL1872 United Airlines 8 2026-06-09
UAL2833 - 7 2026-07-09
UAL2456 United Airlines 7 2026-05-18
UAL2124 - 7 2026-07-05
UAL1950 - 7 2026-07-14
UAL1936 United Airlines 7 2026-06-09
UAL1927 - 7 2026-07-06
UAL1563 United Airlines 7 2026-06-09
UAL1493 - 7 2026-06-28
UAL2170 United Airlines 6 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1950 - Jul 14, 03:00 UTCJul 14, 03:50 UTC50m
2026-07-14 UAL1950 IAH → MFE Jul 14, 03:00 UTCJul 14, 03:51 UTC51m
2026-07-13 UAL2449 - Jul 13, 00:10 UTCJul 13, 03:01 UTC2h 50m
2026-07-12 UAL1971 - Jul 12, 19:40 UTCJul 12, 22:15 UTC2h 35m
2026-07-12 UAL2812 - Jul 12, 15:45 UTCJul 12, 18:01 UTC2h 15m
2026-07-12 UAL2078 - Jul 12, 01:40 UTCJul 12, 03:45 UTC2h 5m
2026-07-11 UAL497 - Jul 11, 19:10 UTCJul 11, 21:50 UTC2h 40m
2026-07-11 UAL1898 - Jul 11, 15:10 UTCJul 11, 17:45 UTC2h 35m
2026-07-11 UAL1885 PHX → IAH Jul 11, 03:30 UTCJul 11, 05:39 UTC2h 9m
2026-07-11 UAL1885 - Jul 11, 03:20 UTCJul 11, 05:40 UTC2h 20m
2026-07-11 UAL1507 - Jul 11, 00:00 UTCJul 11, 02:10 UTC2h 10m
2026-07-11 UAL1507 IAH → PHX Jul 11, 00:01 UTCJul 11, 02:09 UTC2h 8m
2026-07-09 UAL2833 - Jul 9, 21:10 UTCJul 9, 23:10 UTC2h 0m
2026-07-09 UAL1361 - Jul 9, 17:50 UTCJul 9, 19:45 UTC1h 55m
2026-07-09 UAL2863 - Jul 9, 12:25 UTCJul 9, 15:50 UTC3h 25m
2026-07-09 UAL1148 - Jul 9, 01:55 UTCJul 9, 05:25 UTC3h 30m
2026-07-08 UAL1949 - Jul 8, 20:25 UTCJul 8, 23:45 UTC3h 20m
2026-07-08 UAL2773 - Jul 8, 15:20 UTCJul 8, 18:45 UTC3h 25m
2026-07-08 UAL2773 IAH → SMF Jul 8, 15:24 UTCJul 8, 18:43 UTC3h 19m
2026-07-08 UAL2773 - Jul 8, 11:15 UTCJul 8, 13:10 UTC1h 55m
2026-07-08 UAL2778 - Jul 8, 00:35 UTCJul 8, 02:25 UTC1h 50m
2026-07-07 UAL2237 - Jul 7, 19:30 UTCJul 7, 22:35 UTC3h 5m
2026-07-07 UAL2491 SFO → DEN Jul 7, 14:45 UTCJul 7, 17:30 UTC2h 45m
2026-07-07 UAL678 - Jul 7, 12:15 UTCJul 7, 13:05 UTC50m
2026-07-07 UAL1950 - Jul 7, 02:00 UTCJul 7, 02:45 UTC45m
2026-07-06 UAL1927 - Jul 6, 20:20 UTCJul 6, 23:55 UTC3h 35m
2026-07-06 UAL740 - Jul 6, 14:55 UTCJul 6, 18:45 UTC3h 50m
2026-07-06 UAL678 - Jul 6, 12:20 UTCJul 6, 13:10 UTC50m
2026-07-06 UAL1950 - Jul 6, 02:30 UTCJul 6, 03:10 UTC40m
2026-07-05 UAL1927 - Jul 5, 20:15 UTCJul 6, 00:00 UTC3h 45m
2026-07-05 UAL740 - Jul 5, 14:50 UTCJul 5, 18:55 UTC4h 5m
2026-07-05 UAL2124 - Jul 5, 12:10 UTCJul 5, 13:00 UTC50m
2026-07-05 UAL2140 - Jul 5, 00:00 UTCJul 5, 00:45 UTC45m
2026-07-04 UAL313 - Jul 4, 21:10 UTCJul 4, 22:05 UTC55m
2026-07-04 UAL2385 - Jul 4, 17:50 UTCJul 4, 18:35 UTC45m
2026-07-04 UAL2385 IAH → MSY Jul 4, 18:01 UTCJul 4, 18:34 UTC33m
2026-07-04 UAL2863 - Jul 4, 12:30 UTCJul 4, 15:45 UTC3h 15m
2026-07-04 UAL1148 - Jul 4, 03:30 UTCJul 4, 07:00 UTC3h 30m
2026-07-04 UAL1148 IAH → SMF Jul 4, 03:24 UTCJul 4, 06:57 UTC3h 33m
2026-07-03 UAL1752 - Jul 3, 23:10 UTCJul 4, 02:05 UTC2h 55m
2026-07-03 UAL1345 - Jul 3, 17:45 UTCJul 3, 20:00 UTC2h 15m
2026-07-03 UAL1345 YYZ → IAH Jul 3, 17:46 UTCJul 3, 20:04 UTC2h 18m
2026-07-03 UAL2863 - Jul 3, 12:25 UTCJul 3, 15:40 UTC3h 15m
2026-07-03 UAL1148 - Jul 3, 02:10 UTCJul 3, 05:45 UTC3h 35m
2026-07-02 UAL1752 - Jul 2, 22:10 UTCJul 3, 00:20 UTC2h 10m
2026-07-02 UAL1345 - Jul 2, 18:40 UTCJul 2, 20:55 UTC2h 15m
2026-07-02 UAL722 - Jul 2, 13:10 UTCJul 2, 15:30 UTC2h 20m
2026-07-01 UAL277 - Jul 1, 22:25 UTCJul 2, 00:30 UTC2h 5m
2026-07-01 UAL2406 MCO → IAH Jul 1, 18:22 UTCJul 1, 20:21 UTC1h 59m
2026-07-01 UAL2406 - Jul 1, 18:20 UTCJul 1, 20:25 UTC2h 5m

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 N31412 page for operator, model, and routing details .

Mode-S A35843 frequently asked

What is Mode-S code A35843?
A35843 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N31412.
Where is Mode-S A35843 registered?
Mode-S code A35843 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 A35843 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A35843, octal 50654103, decimal 10,704,963.
What flights does A35843 operate?
Mode-S A35843 has broadcast 20 distinct callsigns, including UAL1345, UAL1752, UAL2406, UAL2863, UAL2310.