Apparatus

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sensors Mode-S transponder

A43EEA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37295 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A43EEA
Octal
51037352
Decimal
10,764,010
Country
US
Tail
N37295
Type
B38M
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
445
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A43EEA.

Country allocation

The ICAO 24-bit address A43EEA 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
UAL1901 - 8 2026-07-07
UAL1751 - 7 2026-07-14
UAL1903 - 6 2026-07-14
UAL2252 United Airlines 5 2026-05-03
UAL1353 - 5 2026-06-24
UAL1137 - 5 2026-07-07
UAL700 United Airlines 4 2026-07-23
UAL1908 - 4 2026-07-02
UAL1596 - 4 2026-07-04
UAL1009 - 4 2026-06-16
UAL559 United Airlines 3 2026-06-09
UAL2866 United Airlines 3 2026-05-02
UAL269 United Airlines 3 2026-05-31
UAL2670 United Airlines 3 2026-05-18
UAL2351 United Airlines 3 2026-06-07
UAL234 United Airlines 3 2026-07-24
UAL231 United Airlines 3 2026-07-20
UAL2203 United Airlines 3 2026-04-15
UAL2147 United Airlines 3 2026-06-11
UAL209 United Airlines 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2313 ORD → IAH Jul 26, 15:00 UTCJul 26, 20:55 UTC5h 55m
2026-07-26 UAL2312 SFO → DEN Jul 26, 07:00 UTCJul 26, 13:05 UTC6h 5m
2026-07-25 UAL628 MIA → EWR Jul 25, 17:55 UTCJul 26, 04:30 UTC10h 35m
2026-07-25 UAL2274 EWR → RSW Jul 25, 15:25 UTCJul 25, 16:35 UTC1h 10m
2026-07-25 UAL1863 PUJ → ORD Jul 25, 04:25 UTCJul 25, 05:40 UTC1h 15m
2026-07-24 UAL234 MSY → IAH Jul 24, 21:55 UTCJul 25, 02:40 UTC4h 45m
2026-07-24 UAL234 MSY → IAH Jul 24, 21:53 UTCJul 25, 02:34 UTC4h 41m
2026-07-24 UAL1084 IAH → CMH Jul 24, 16:25 UTCJul 24, 20:30 UTC4h 5m
2026-07-24 UAL1138 GUA → LAX Jul 24, 09:10 UTCJul 24, 12:55 UTC3h 45m
2026-07-24 UAL1138 GUA → LAX Jul 24, 08:35 UTCJul 24, 08:40 UTC5m
2026-07-23 UAL1632 PDX → SFO Jul 23, 22:05 UTCJul 23, 22:15 UTC10m
2026-07-23 UAL1632 PDX → SFO Jul 23, 19:55 UTCJul 23, 20:20 UTC25m
2026-07-23 UAL700 BOS → EWR Jul 23, 15:00 UTCJul 23, 17:50 UTC2h 50m
2026-07-23 UAL2761 AUS → SFO Jul 23, 01:30 UTCJul 23, 04:10 UTC2h 40m
2026-07-22 UAL2341 SFO → IAH Jul 22, 22:55 UTCJul 22, 23:50 UTC55m
2026-07-22 UAL2341 SFO → IAH Jul 22, 22:47 UTCJul 22, 23:52 UTC1h 5m
2026-07-22 UAL1493 IAH → DEN Jul 22, 20:40 UTCJul 22, 21:35 UTC55m
2026-07-22 UAL508 BOG → IAH Jul 22, 14:15 UTCJul 22, 18:45 UTC4h 30m
2026-07-22 UAL278 - Jul 22, 04:05 UTCJul 22, 05:25 UTC1h 20m
2026-07-21 UAL297 SFO → SAN Jul 21, 12:25 UTCJul 21, 23:50 UTC11h 25m
2026-07-21 UAL1802 IAH → BOS Jul 21, 06:20 UTCJul 21, 10:35 UTC4h 15m
2026-07-20 UAL560 BOS → IAH Jul 20, 23:13 UTCJul 21, 04:38 UTC5h 25m
2026-07-20 UAL560 BOS → IAH Jul 20, 23:25 UTCJul 21, 04:45 UTC5h 19m
2026-07-20 UAL231 LAX → LHR Jul 20, 13:15 UTCJul 20, 20:10 UTC6h 55m
2026-07-20 UAL230 BON → EWR Jul 20, 03:30 UTCJul 20, 10:00 UTC6h 30m
2026-07-19 UAL3040 GUA → EWR Jul 19, 19:40 UTCJul 20, 00:00 UTC4h 20m
2026-07-19 UAL1551 EWR → GUA Jul 19, 03:35 UTCJul 19, 08:20 UTC4h 45m
2026-07-18 UAL1992 PHX → EWR Jul 18, 13:55 UTCJul 18, 18:35 UTC4h 40m
2026-07-17 UAL2858 EWR → PHX Jul 17, 20:50 UTCJul 18, 01:34 UTC4h 45m
2026-07-17 UAL1992 - Jul 17, 13:15 UTCJul 17, 17:30 UTC4h 15m
2026-07-16 UAL2858 - Jul 16, 20:49 UTCJul 17, 01:09 UTC4h 20m
2026-07-16 UAL1975 LAS → EWR Jul 16, 14:25 UTCJul 16, 18:44 UTC4h 20m
2026-07-16 UAL2839 - Jul 16, 06:30 UTCJul 16, 07:30 UTC1h 0m
2026-07-16 UAL2482 STL → SFO Jul 16, 00:50 UTCJul 16, 04:30 UTC3h 40m
2026-07-15 UAL2090 SFO → STL Jul 15, 20:05 UTCJul 15, 23:30 UTC3h 25m
2026-07-15 UAL369 - Jul 15, 12:20 UTCJul 15, 17:15 UTC4h 55m
2026-07-15 UAL1627 - Jul 15, 00:45 UTCJul 15, 03:40 UTC2h 55m
2026-07-14 UAL1903 - Jul 14, 20:25 UTCJul 14, 21:10 UTC45m
2026-07-14 UAL1903 GUA → IAH Jul 14, 18:48 UTCJul 14, 21:07 UTC2h 19m
2026-07-14 UAL1903 - Jul 14, 18:35 UTCJul 14, 18:50 UTC15m
2026-07-14 UAL1751 - Jul 14, 17:00 UTCJul 14, 17:15 UTC15m
2026-07-14 UAL1751 - Jul 14, 15:00 UTCJul 14, 15:30 UTC30m
2026-07-14 UAL438 GEO → IAH Jul 14, 05:39 UTCJul 14, 11:54 UTC6h 15m
2026-07-13 UAL438 - Jul 13, 22:25 UTCJul 14, 12:00 UTC13h 35m
2026-07-13 UAL2162 - Jul 13, 18:20 UTCJul 13, 20:40 UTC2h 20m
2026-07-13 UAL2162 FLL → IAH Jul 13, 17:27 UTCJul 13, 20:35 UTC3h 8m
2026-07-13 UAL2261 - Jul 13, 12:55 UTCJul 13, 15:00 UTC2h 5m
2026-07-13 UAL2261 IAH → FLL Jul 13, 12:54 UTCJul 13, 15:01 UTC2h 7m
2026-07-13 UAL206 BOG → IAH Jul 13, 05:42 UTCJul 13, 10:19 UTC4h 37m
2026-07-13 UAL206 - Jul 13, 05:45 UTCJul 13, 06:10 UTC25m

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 N37295 page for operator, model, and routing details .

Mode-S A43EEA frequently asked

What is Mode-S code A43EEA?
A43EEA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37295.
Where is Mode-S A43EEA registered?
Mode-S code A43EEA 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 A43EEA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A43EEA, octal 51037352, decimal 10,764,010.
What flights does A43EEA operate?
Mode-S A43EEA has broadcast 20 distinct callsigns, including UAL1901, UAL1751, UAL1903, UAL2252, UAL1353.