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 Jul 26, 09:55 UTC
Flights observed
238
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 09:55 UTC

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 United Airlines 29 2026-07-26
UAL32 United Airlines 22 2026-07-26
UAL837 United Airlines 19 2026-07-03
UAL197 - 18 2026-07-19
UAL849 - 17 2026-07-16
UAL838 - 17 2026-07-04
UAL848 - 15 2026-07-16
UAL196 United Airlines 15 2026-07-25
UAL827 United Airlines 10 2026-07-22
UAL873 - 9 2026-07-21
UAL158 - 9 2026-07-20
UAL183 - 7 2026-07-14
UAL193 United Airlines 6 2026-06-16
UAL157 - 6 2026-07-20
UAL151 - 5 2026-07-20
UAL150 - 5 2026-07-20
UAL865 - 4 2026-06-22
UAL184 United Airlines 4 2026-05-26
UAL864 - 3 2026-06-20
UAL192 - 3 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL32 LAX → NRT Jul 26, 09:15 UTCJul 26, 09:55 UTC40m
2026-07-26 UAL33 NRT → LAX Jul 26, 01:36 UTCJul 26, 05:48 UTC4h 12m
2026-07-25 UAL33 NRT → LAX Jul 25, 09:15 UTCJul 26, 05:55 UTC20h 40m
2026-07-25 UAL196 GUM → NRT Jul 25, 04:50 UTCJul 25, 05:30 UTC40m
2026-07-22 UAL874 NRT → GUM Jul 22, 12:05 UTCJul 22, 12:40 UTC35m
2026-07-22 UAL827 NRT → GUM Jul 22, 02:05 UTCJul 22, 02:50 UTC45m
2026-07-22 UAL827 NRT → GUM Jul 22, 02:17 UTCJul 22, 05:14 UTC2h 57m
2026-07-21 UAL873 - Jul 21, 09:35 UTCJul 21, 10:20 UTC45m
2026-07-21 UAL827 - Jul 21, 02:10 UTCJul 21, 02:45 UTC35m
2026-07-21 UAL827 NRT → GUM Jul 21, 02:17 UTCJul 21, 05:25 UTC3h 8m
2026-07-20 UAL828 GUM → NRT Jul 20, 21:18 UTCJul 21, 00:26 UTC3h 8m
2026-07-20 UAL158 - Jul 20, 17:00 UTCJul 20, 17:20 UTC20m
2026-07-20 UAL157 - Jul 20, 15:05 UTCJul 20, 15:30 UTC25m
2026-07-20 UAL150 - Jul 20, 02:50 UTCJul 20, 03:05 UTC15m
2026-07-20 UAL151 - Jul 20, 00:15 UTCJul 20, 00:25 UTC10m
2026-07-19 UAL151 GUM → KIX Jul 19, 21:28 UTCJul 20, 00:20 UTC2h 52m
2026-07-19 UAL197 - Jul 19, 08:25 UTCJul 19, 09:00 UTC35m
2026-07-19 UAL33 NRT → LAX Jul 19, 04:50 UTCJul 19, 05:40 UTC50m
2026-07-19 UAL33 NRT → LAX Jul 19, 01:36 UTCJul 19, 05:32 UTC3h 56m
2026-07-18 UAL32 LAX → NRT Jul 18, 09:20 UTCJul 18, 10:00 UTC40m
2026-07-18 UAL32 LAX → NRT Jul 18, 09:22 UTCJul 18, 13:27 UTC4h 5m
2026-07-18 UAL33 NRT → LAX Jul 18, 05:05 UTCJul 18, 06:00 UTC55m
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

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 Jul 26, 09:55 UTC.
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, UAL32, UAL837, UAL197, UAL849.