Apparatus

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sensors Mode-S transponder

A1435D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1802U · operated by SOUTHWEST AIRLINES CO

Hex
A1435D
Octal
50241535
Decimal
10,568,541
Country
US
Tail
N1802U
Type
B38M
No current signal · last broadcast Jul 26, 17:45 UTC
Flights observed
693
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:45 UTC

Last known position

Most recent position reported by Mode-S A1435D.

Country allocation

The ICAO 24-bit address A1435D 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
SWA3089 - 6 2026-07-13
SWA1597 Southwest Airlines 6 2026-05-30
SWA112 Southwest Airlines 6 2026-05-24
SWA657 Southwest Airlines 5 2026-05-15
SWA3101 Southwest Airlines 5 2026-07-22
SWA2523 Southwest Airlines 5 2026-05-29
SWA2254 Southwest Airlines 5 2026-05-28
SWA2008 Southwest Airlines 5 2026-06-04
SWA1972 Southwest Airlines 5 2026-05-21
SWA1881 Southwest Airlines 5 2026-05-07
SWA1203 Southwest Airlines 5 2026-05-24
SWA9000 - 4 2026-07-11
SWA675 - 4 2026-07-11
SWA308 - 4 2026-07-15
SWA2169 - 4 2026-07-12
SWA2168 - 4 2026-07-11
SWA930 - 3 2026-07-07
SWA837 - 3 2026-07-01
SWA785 Southwest Airlines 3 2026-04-13
SWA718 Southwest Airlines 3 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2138 BNA → PHL Jul 26, 16:35 UTCJul 26, 17:45 UTC1h 10m
2026-07-26 SWA2309 ONT → SJC Jul 26, 14:05 UTCJul 26, 14:55 UTC50m
2026-07-26 SWA2309 ONT → SJC Jul 26, 14:05 UTCJul 26, 14:50 UTC45m
2026-07-26 SWA4078 MCO → STL Jul 26, 03:20 UTCJul 26, 04:15 UTC55m
2026-07-26 SWA4078 MCO → STL Jul 26, 03:14 UTCJul 26, 04:07 UTC53m
2026-07-26 SWA2561 MDW → LGA Jul 26, 01:30 UTCJul 26, 02:15 UTC45m
2026-07-25 SWA1010 LGB → OAK Jul 25, 18:20 UTCJul 26, 00:15 UTC5h 55m
2026-07-25 SWA2188 DAL → LGA Jul 25, 13:40 UTCJul 25, 16:55 UTC3h 15m
2026-07-25 SWA1566 DEN → HOU Jul 25, 04:00 UTCJul 25, 05:25 UTC1h 25m
2026-07-25 SWA4246 LAS → OAK Jul 25, 01:05 UTCJul 25, 03:05 UTC2h 0m
2026-07-24 SWA1940 SJC → DEN Jul 24, 18:30 UTCJul 24, 18:50 UTC20m
2026-07-24 SWA1940 SJC → DEN Jul 24, 18:27 UTCJul 24, 22:56 UTC4h 29m
2026-07-24 SWA2148 FLL → STL Jul 24, 16:20 UTCJul 24, 16:50 UTC30m
2026-07-24 SWA2148 FLL → STL Jul 24, 16:05 UTCJul 24, 16:42 UTC37m
2026-07-24 SWA1907 HOU → LGA Jul 24, 07:00 UTCJul 24, 07:20 UTC20m
2026-07-24 SWA1907 HOU → LGA Jul 24, 06:57 UTCJul 24, 07:34 UTC37m
2026-07-24 SWA2170 BUR → LAS Jul 24, 05:10 UTCJul 24, 05:35 UTC25m
2026-07-24 SWA2170 BUR → LAS Jul 24, 05:06 UTCJul 24, 05:28 UTC22m
2026-07-24 SWA1911 PHX → OAK Jul 24, 03:45 UTCJul 24, 04:15 UTC30m
2026-07-24 SWA2151 PHX → SJC Jul 24, 02:15 UTCJul 24, 02:45 UTC30m
2026-07-24 SWA2151 PHX → SJC Jul 24, 02:01 UTCJul 24, 02:42 UTC41m
2026-07-24 SWA648 LAX → OAK Jul 24, 00:20 UTCJul 24, 00:45 UTC25m
2026-07-23 SWA2150 AUS → SMF Jul 23, 22:05 UTCJul 23, 22:30 UTC25m
2026-07-23 SWA1903 BUR → SJC Jul 23, 19:15 UTCJul 23, 19:35 UTC20m
2026-07-23 SWA3092 BWI → MHT Jul 23, 17:40 UTCJul 23, 18:05 UTC25m
2026-07-23 SWA1927 DCA → MSY Jul 23, 16:00 UTCJul 23, 16:20 UTC20m
2026-07-23 SWA1927 DCA → MSY Jul 23, 15:59 UTCJul 23, 16:23 UTC24m
2026-07-22 SWA2240 - Jul 22, 17:30 UTCJul 22, 18:30 UTC1h 0m
2026-07-22 SWA2240 LAX → MDW Jul 22, 17:27 UTCJul 22, 23:28 UTC6h 1m
2026-07-22 SWA2514 SJC → ONT Jul 22, 06:15 UTCJul 22, 11:19 UTC5h 4m
2026-07-22 SWA3101 LAS → SJC Jul 22, 00:05 UTCJul 22, 00:25 UTC20m
2026-07-21 SWA1457 - Jul 21, 22:20 UTCJul 21, 22:30 UTC10m
2026-07-21 SWA1457 - Jul 21, 16:45 UTCJul 21, 17:35 UTC50m
2026-07-21 SWA1457 LAS → OGG Jul 21, 16:40 UTCJul 21, 22:30 UTC5h 50m
2026-07-21 SWA2125 SNA → DEN Jul 21, 11:30 UTCJul 21, 14:50 UTC3h 20m
2026-07-21 SWA2250 OAK → LAS Jul 21, 01:10 UTCJul 21, 02:50 UTC1h 40m
2026-07-20 SWA3254 - Jul 20, 14:45 UTCJul 20, 16:50 UTC2h 5m
2026-07-20 SWA3254 PHX → DAL Jul 20, 14:42 UTCJul 20, 16:43 UTC2h 1m
2026-07-20 SWA672 LAS → DEN Jul 20, 09:55 UTCJul 20, 11:45 UTC1h 50m
2026-07-19 SWA3060 OAK → OGG Jul 19, 21:05 UTCJul 20, 02:07 UTC5h 2m
2026-07-19 SWA3060 - Jul 19, 21:05 UTCJul 19, 21:40 UTC35m
2026-07-19 SWA1713 SEA → OAK Jul 19, 17:50 UTCJul 19, 19:30 UTC1h 40m
2026-07-19 SWA1713 DEN → SEA Jul 19, 14:00 UTCJul 19, 16:20 UTC2h 20m
2026-07-19 SWA173 CVG → MDW Jul 19, 06:45 UTCJul 19, 11:24 UTC4h 39m
2026-07-19 SWA173 CVG → MDW Jul 19, 06:45 UTCJul 19, 11:15 UTC4h 30m
2026-07-19 SWA2811 DEN → ANC Jul 19, 00:05 UTCJul 19, 05:04 UTC4h 59m
2026-07-19 SWA2811 DEN → ANC Jul 19, 00:05 UTCJul 19, 05:10 UTC5h 5m
2026-07-18 SWA1266 LGA → MSY Jul 18, 20:50 UTCJul 18, 22:50 UTC2h 0m
2026-07-18 SWA1266 LGA → MSY Jul 18, 18:25 UTCJul 18, 19:30 UTC1h 5m
2026-07-18 SWA439 LAS → SJC Jul 18, 16:15 UTCJul 18, 17:10 UTC55m

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 N1802U page for operator, model, and routing details .

Mode-S A1435D frequently asked

What is Mode-S code A1435D?
A1435D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1802U.
Where is Mode-S A1435D registered?
Mode-S code A1435D 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 A1435D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1435D, octal 50241535, decimal 10,568,541.
What flights does A1435D operate?
Mode-S A1435D has broadcast 20 distinct callsigns, including SWA3089, SWA1597, SWA112, SWA657, SWA3101.