Apparatus

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sensors Mode-S transponder

A43EE8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37293 · BOEING 737-800 · operated by WELLS FARGO TRUST CO NA TRUSTEE

Hex
A43EE8
Octal
51037350
Decimal
10,764,008
Country
US
Tail
N37293
Type
B738
No current signal · last broadcast 14h ago
Flights observed
216
Distinct callsigns
20
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A43EE8.

Country allocation

The ICAO 24-bit address A43EE8 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
UAL33 - 24 2026-07-03
UAL837 United Airlines 19 2026-07-03
UAL32 United Airlines 19 2026-07-17
UAL849 - 17 2026-07-16
UAL838 - 17 2026-07-04
UAL197 - 17 2026-07-04
UAL848 - 15 2026-07-16
UAL196 - 14 2026-07-17
UAL873 - 8 2026-06-29
UAL158 United Airlines 8 2026-06-07
UAL183 - 7 2026-07-14
UAL827 - 6 2026-06-30
UAL193 United Airlines 6 2026-06-16
UAL157 - 5 2026-07-13
UAL865 - 4 2026-06-22
UAL184 United Airlines 4 2026-05-26
UAL150 United Airlines 4 2026-05-25
UAL864 - 3 2026-06-20
UAL192 - 3 2026-07-14
UAL151 - 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 UAL32 LAX → NRT Jul 17, 09:20 UTCJul 17, 10:00 UTC40m
2026-07-17 UAL32 LAX → NRT Jul 17, 09:22 UTCJul 17, 13:27 UTC4h 5m
2026-07-17 UAL196 - Jul 17, 05:10 UTCJul 17, 05:55 UTC45m
2026-07-16 UAL848 HND → GUM Jul 16, 15:10 UTCJul 16, 18:19 UTC3h 9m
2026-07-16 UAL848 - Jul 16, 15:10 UTCJul 16, 15:35 UTC25m
2026-07-16 UAL849 GUM → HND Jul 16, 09:44 UTCJul 16, 13:25 UTC3h 41m
2026-07-16 UAL849 - Jul 16, 02:40 UTCJul 16, 13:45 UTC11h 5m
2026-07-16 UAL137 - Jul 16, 00:35 UTCJul 16, 00:45 UTC10m
2026-07-15 UAL137 GUM → NGO Jul 15, 21:43 UTCJul 16, 00:55 UTC3h 12m
2026-07-15 UAL848 - Jul 15, 14:45 UTCJul 15, 15:15 UTC30m
2026-07-15 UAL849 - Jul 15, 12:25 UTCJul 15, 13:15 UTC50m
2026-07-14 UAL192 - Jul 14, 18:10 UTCJul 14, 18:20 UTC10m
2026-07-14 UAL192 ROR → GUM Jul 14, 14:50 UTCJul 14, 16:46 UTC1h 56m
2026-07-14 UAL192 - Jul 14, 14:35 UTCJul 14, 16:55 UTC2h 20m
2026-07-14 UAL183 - Jul 14, 12:10 UTCJul 14, 12:55 UTC45m
2026-07-13 UAL183 - Jul 13, 17:05 UTCJul 14, 12:55 UTC19h 50m
2026-07-13 UAL157 - Jul 13, 15:05 UTCJul 13, 15:30 UTC25m
2026-07-13 UAL157 GUM → ROR Jul 13, 13:57 UTCJul 13, 15:23 UTC1h 26m
2026-07-09 UAL3018 - Jul 9, 17:50 UTCJul 9, 18:10 UTC20m
2026-07-09 UAL3017 - Jul 9, 12:20 UTCJul 9, 12:40 UTC20m
2026-07-08 UAL848 HND → GUM Jul 8, 15:00 UTCJul 8, 17:51 UTC2h 51m
2026-07-08 UAL848 - Jul 8, 14:45 UTCJul 8, 15:15 UTC30m
2026-07-08 UAL849 - Jul 8, 12:05 UTCJul 8, 13:00 UTC55m
2026-07-04 UAL197 - Jul 4, 08:10 UTCJul 4, 08:35 UTC25m
2026-07-04 UAL838 KHH → NRT Jul 4, 01:55 UTCJul 4, 05:05 UTC3h 10m
2026-07-03 UAL837 SFO → NRT Jul 3, 09:10 UTCJul 3, 12:00 UTC2h 50m
2026-07-03 UAL837 SFO → NRT Jul 3, 09:22 UTCJul 3, 12:32 UTC3h 10m
2026-07-03 UAL33 CEB → NRT Jul 3, 01:36 UTCJul 3, 05:32 UTC3h 56m
2026-07-02 UAL32 - Jul 2, 09:10 UTCJul 2, 09:50 UTC40m
2026-07-01 UAL848 - Jul 1, 14:40 UTCJul 2, 05:40 UTC15h 0m
2026-07-01 UAL849 GUM → HND Jul 1, 09:44 UTCJul 1, 12:53 UTC3h 9m
2026-07-01 UAL849 KIX → HND Jul 1, 02:15 UTCJul 1, 13:00 UTC10h 45m
2026-07-01 UAL151 - Jul 1, 00:25 UTCJul 1, 00:40 UTC15m
2026-06-30 UAL827 - Jun 30, 02:05 UTCJun 30, 02:35 UTC30m
2026-06-29 UAL873 - Jun 29, 09:50 UTCJun 29, 10:34 UTC45m
2026-06-28 UAL848 - Jun 28, 14:50 UTCJun 29, 10:34 UTC19h 45m
2026-06-28 UAL849 - Jun 28, 12:15 UTCJun 28, 13:10 UTC55m
2026-06-27 UAL197 - Jun 27, 11:30 UTCJun 27, 12:09 UTC40m
2026-06-27 UAL197 NRT → GUM Jun 27, 10:22 UTCJun 27, 14:44 UTC4h 22m
2026-06-27 UAL838 KHH → NRT Jun 27, 05:29 UTCJun 27, 08:49 UTC3h 20m
2026-06-27 UAL838 KHH → NRT Jun 27, 05:13 UTCJun 27, 08:49 UTC3h 36m
2026-06-27 UAL3935 GUM → KHH Jun 27, 00:04 UTCJun 27, 04:02 UTC3h 58m
2026-06-24 UAL848 - Jun 24, 14:50 UTCJun 24, 15:14 UTC25m
2026-06-24 UAL849 GUM → HND Jun 24, 09:44 UTCJun 24, 13:16 UTC3h 32m
2026-06-24 UAL849 - Jun 24, 02:09 UTCJun 24, 13:24 UTC11h 15m
2026-06-23 UAL873 - Jun 23, 09:49 UTCJun 23, 10:29 UTC40m
2026-06-22 UAL865 - Jun 22, 08:04 UTCJun 22, 08:40 UTC35m
2026-06-22 UAL865 NRT → GUM Jun 22, 07:52 UTCJun 22, 11:10 UTC3h 18m
2026-06-21 UAL33 - Jun 21, 12:40 UTCJun 22, 06:15 UTC17h 35m
2026-06-21 UAL33 - Jun 21, 09:04 UTCJun 22, 06:15 UTC21h 10m

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 N37293 page for operator, model, and routing details .

Mode-S A43EE8 frequently asked

What is Mode-S code A43EE8?
A43EE8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37293.
Where is Mode-S A43EE8 registered?
Mode-S code A43EE8 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 A43EE8 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A43EE8, octal 51037350, decimal 10,764,008.
What flights does A43EE8 operate?
Mode-S A43EE8 has broadcast 20 distinct callsigns, including UAL33, UAL837, UAL32, UAL849, UAL838.