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 38m ago
Flights observed
615
Distinct callsigns
20
Country
US
Last broadcast
38m ago

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
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
SWA3101 - 4 2026-07-06
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
SWA4764 Southwest Airlines 3 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA2329 - Jul 14, 02:40 UTCJul 14, 03:15 UTC35m
2026-07-14 SWA3620 LAS → SAN Jul 14, 00:05 UTCJul 14, 00:55 UTC50m
2026-07-13 SWA3620 SEA → LAS Jul 13, 20:05 UTCJul 13, 22:15 UTC2h 10m
2026-07-13 SWA3051 DEN → SEA Jul 13, 16:20 UTCJul 13, 18:30 UTC2h 10m
2026-07-13 SWA482 PHX → DEN Jul 13, 07:01 UTCJul 13, 08:25 UTC1h 25m
2026-07-13 SWA482 PHX → DEN Jul 13, 07:01 UTCJul 13, 08:23 UTC1h 22m
2026-07-13 SWA3160 - Jul 13, 05:01 UTCJul 13, 06:05 UTC1h 5m
2026-07-13 SWA3089 OAK → ONT Jul 13, 01:56 UTCJul 13, 02:55 UTC59m
2026-07-13 SWA3089 OAK → ONT Jul 13, 02:01 UTCJul 13, 03:01 UTC1h 0m
2026-07-13 SWA3089 - Jul 13, 00:10 UTCJul 13, 00:55 UTC45m
2026-07-12 SWA508 - Jul 12, 06:40 UTCJul 12, 06:55 UTC15m
2026-07-12 SWA3098 - Jul 12, 05:05 UTCJul 12, 05:25 UTC20m
2026-07-12 SWA1933 HNL → OGG Jul 12, 03:30 UTCJul 12, 03:54 UTC24m
2026-07-12 SWA2169 KOA → HNL Jul 12, 01:39 UTCJul 12, 02:14 UTC35m
2026-07-12 SWA2169 - Jul 12, 01:40 UTCJul 12, 02:15 UTC35m
2026-07-11 SWA561 HNL → KOA Jul 11, 23:30 UTCJul 12, 00:01 UTC31m
2026-07-11 SWA2168 KOA → HNL Jul 11, 21:46 UTCJul 11, 22:16 UTC30m
2026-07-11 SWA2168 KOA → HNL Jul 11, 21:50 UTCJul 11, 22:20 UTC30m
2026-07-11 SWA675 - Jul 11, 20:00 UTCJul 11, 20:30 UTC30m
2026-07-11 SWA2149 - Jul 11, 18:25 UTCJul 11, 18:55 UTC30m
2026-07-11 SWA1902 - Jul 11, 16:10 UTCJul 11, 16:30 UTC20m
2026-07-11 SWA9000 - Jul 11, 02:20 UTCJul 11, 07:25 UTC5h 5m
2026-07-10 SWA3540 - Jul 10, 23:35 UTCJul 11, 00:35 UTC1h 0m
2026-07-10 SWA2809 PDX → SAN Jul 10, 20:20 UTCJul 10, 22:25 UTC2h 5m
2026-07-10 SWA2809 MDW → PDX Jul 10, 15:25 UTCJul 10, 19:10 UTC3h 45m
2026-07-10 SWA1197 - Jul 10, 13:20 UTCJul 10, 14:20 UTC1h 0m
2026-07-10 SWA2616 - Jul 10, 10:15 UTCJul 10, 12:05 UTC1h 50m
2026-07-10 SWA2616 MCO → CMH Jul 10, 10:14 UTCJul 10, 12:00 UTC1h 46m
2026-07-10 SWA4405 - Jul 10, 01:40 UTCJul 10, 03:45 UTC2h 5m
2026-07-10 SWA4054 - Jul 10, 00:05 UTCJul 10, 00:45 UTC40m
2026-07-09 SWA4782 - Jul 9, 22:10 UTCJul 9, 23:10 UTC1h 0m
2026-07-09 SWA1476 - Jul 9, 19:25 UTCJul 9, 21:05 UTC1h 40m
2026-07-09 SWA3739 SLC → DEN Jul 9, 17:20 UTCJul 9, 18:20 UTC1h 0m
2026-07-09 SWA2957 LAS → SLC Jul 9, 14:55 UTCJul 9, 15:50 UTC55m
2026-07-09 SWA4205 SLC → LAS Jul 9, 12:40 UTCJul 9, 13:35 UTC55m
2026-07-09 SWA4205 SLC → LAS Jul 9, 12:37 UTCJul 9, 13:37 UTC1h 0m
2026-07-09 SWA1160 DAL → SLC Jul 9, 02:05 UTCJul 9, 04:20 UTC2h 15m
2026-07-08 SWA3671 - Jul 8, 22:15 UTCJul 9, 00:55 UTC2h 40m
2026-07-08 SWA1608 CUN → BWI Jul 8, 17:05 UTCJul 8, 20:00 UTC2h 55m
2026-07-08 SWA317 - Jul 8, 14:00 UTCJul 8, 15:45 UTC1h 45m
2026-07-08 SWA4547 - Jul 8, 11:30 UTCJul 8, 12:15 UTC45m
2026-07-08 SWA3301 DEN → MSY Jul 8, 01:50 UTCJul 8, 04:00 UTC2h 10m
2026-07-07 SWA700 - Jul 7, 23:00 UTCJul 8, 00:30 UTC1h 30m
2026-07-07 SWA700 BOI → DEN Jul 7, 22:58 UTCJul 8, 00:30 UTC1h 32m
2026-07-07 SWA4669 - Jul 7, 20:20 UTCJul 7, 21:50 UTC1h 30m
2026-07-07 SWA930 - Jul 7, 17:10 UTCJul 7, 18:45 UTC1h 35m
2026-07-07 SWA930 DAL → DEN Jul 7, 17:09 UTCJul 7, 18:42 UTC1h 33m
2026-07-07 SWA930 - Jul 7, 13:25 UTCJul 7, 16:05 UTC2h 40m
2026-07-07 SWA621 SJC → BWI Jul 7, 05:05 UTCJul 7, 09:45 UTC4h 40m
2026-07-07 SWA3104 - Jul 7, 02:35 UTCJul 7, 03:20 UTC45m

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 38m ago.
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, SWA2523.