Apparatus

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sensors Mode-S transponder

A53B69

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N436WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A53B69
Octal
51235551
Decimal
10,828,649
Country
US
Tail
N436WN
Type
B737
No current signal · last broadcast 21d ago
Flights observed
517
Distinct callsigns
20
Country
US
Last broadcast
21d ago

Last known position

Most recent position reported by Mode-S A53B69.

Country allocation

The ICAO 24-bit address A53B69 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
SWA826 Southwest Airlines 7 2026-04-16
SWA19 Southwest Airlines 7 2026-05-24
SWA1465 Southwest Airlines 6 2026-05-14
SWA1838 Southwest Airlines 5 2026-04-18
SWA14 Southwest Airlines 5 2026-05-24
SWA1363 Southwest Airlines 5 2026-05-22
SWA534 Southwest Airlines 4 2026-04-28
SWA4184 - 4 2026-04-16
SWA3624 Southwest Airlines 4 2026-06-09
SWA3386 Southwest Airlines 4 2026-06-13
SWA278 - 4 2026-06-15
SWA1460 Southwest Airlines 4 2026-04-17
SWA967 Southwest Airlines 3 2026-05-27
SWA779 Southwest Airlines 3 2026-05-05
SWA756 Southwest Airlines 3 2026-05-27
SWA712 Southwest Airlines 3 2026-05-10
SWA544 - 3 2026-06-20
SWA4742 Southwest Airlines 3 2026-06-12
SWA4703 Southwest Airlines 3 2026-04-19
SWA4607 Southwest Airlines 3 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-22 SWA8700 SJC → PHX Jun 22, 20:14 UTCJun 22, 21:30 UTC1h 15m
2026-06-21 SWA4013 - Jun 21, 16:10 UTCJun 21, 17:20 UTC1h 10m
2026-06-21 SWA991 - Jun 21, 12:35 UTCJun 21, 14:59 UTC2h 25m
2026-06-21 SWA354 SAN → MDW Jun 21, 06:07 UTCJun 21, 09:35 UTC3h 28m
2026-06-21 SWA354 - Jun 21, 06:10 UTCJun 21, 09:40 UTC3h 30m
2026-06-21 SWA3038 SMF → SAN Jun 21, 03:55 UTCJun 21, 05:00 UTC1h 5m
2026-06-20 SWA3038 - Jun 20, 23:34 UTCJun 21, 03:00 UTC3h 25m
2026-06-20 SWA3038 - Jun 20, 20:09 UTCJun 20, 22:25 UTC2h 15m
2026-06-20 SWA544 - Jun 20, 17:54 UTCJun 20, 18:14 UTC20m
2026-06-20 SWA544 DTW → BWI Jun 20, 17:53 UTCJun 20, 18:55 UTC1h 2m
2026-06-20 SWA544 - Jun 20, 15:39 UTCJun 20, 16:49 UTC1h 10m
2026-06-20 SWA2603 - Jun 20, 12:50 UTCJun 20, 14:24 UTC1h 35m
2026-06-20 SWA3374 - Jun 20, 09:19 UTCJun 20, 11:20 UTC2h 0m
2026-06-20 SWA3374 PIT → MCO Jun 20, 09:19 UTCJun 20, 11:12 UTC1h 53m
2026-06-20 SWA353 - Jun 20, 04:24 UTCJun 20, 06:10 UTC1h 45m
2026-06-20 SWA353 MCO → PIT Jun 20, 04:21 UTCJun 20, 06:10 UTC1h 49m
2026-06-20 SWA353 AUS → MCO Jun 20, 00:49 UTCJun 20, 03:19 UTC2h 30m
2026-06-19 SWA329 - Jun 19, 20:29 UTCJun 19, 22:49 UTC2h 20m
2026-06-19 SWA8512 - Jun 19, 16:59 UTCJun 19, 17:49 UTC50m
2026-06-19 SWA8512 TUL → STL Jun 19, 16:57 UTCJun 19, 17:48 UTC51m
2026-06-19 SWA4445 - Jun 19, 15:19 UTCJun 19, 16:09 UTC50m
2026-06-19 SWA4445 DAL → TUL Jun 19, 15:18 UTCJun 19, 16:15 UTC57m
2026-06-19 SWA3492 OAK → LGB Jun 19, 03:44 UTCJun 19, 06:10 UTC2h 25m
2026-06-19 SWA3492 OAK → LGB Jun 19, 03:42 UTCJun 19, 06:09 UTC2h 27m
2026-06-19 SWA4485 AUS → SMF Jun 19, 01:34 UTCJun 19, 02:45 UTC1h 10m
2026-06-18 SWA4647 STL → BOS Jun 18, 23:35 UTCJun 19, 00:24 UTC49m
2026-06-18 SWA790 BUR → LAS Jun 18, 21:30 UTCJun 18, 22:15 UTC45m
2026-06-18 SWA790 BUR → LAS Jun 18, 21:27 UTCJun 18, 22:13 UTC46m
2026-06-18 SWA3661 - Jun 18, 19:25 UTCJun 18, 20:15 UTC50m
2026-06-18 SWA3661 SJC → BUR Jun 18, 19:22 UTCJun 18, 20:10 UTC48m
2026-06-18 SWA3336 - Jun 18, 16:50 UTCJun 18, 18:25 UTC1h 35m
2026-06-18 SWA3336 PHX → SJC Jun 18, 16:49 UTCJun 18, 18:21 UTC1h 32m
2026-06-18 SWA3336 DEN → PHX Jun 18, 14:25 UTCJun 18, 15:50 UTC1h 25m
2026-06-18 SWA3111 OKC → DEN Jun 18, 11:10 UTCJun 18, 12:30 UTC1h 20m
2026-06-18 SWA3111 OKC → DEN Jun 18, 11:10 UTCJun 18, 12:23 UTC1h 13m
2026-06-18 SWA175 - Jun 18, 02:00 UTCJun 18, 03:00 UTC1h 0m
2026-06-17 SWA1645 - Jun 17, 22:10 UTCJun 18, 00:45 UTC2h 35m
2026-06-17 SWA1645 - Jun 17, 19:50 UTCJun 17, 21:10 UTC1h 20m
2026-06-17 SWA4206 - Jun 17, 17:30 UTCJun 17, 18:40 UTC1h 10m
2026-06-17 SWA4206 TYS → MCO Jun 17, 17:26 UTCJun 17, 18:38 UTC1h 12m
2026-06-17 SWA4206 - Jun 17, 15:35 UTCJun 17, 16:05 UTC30m
2026-06-17 SWA2531 PHX → OAK Jun 17, 12:55 UTCJun 17, 14:00 UTC1h 5m
2026-06-17 SWA2531 PHX → OAK Jun 17, 12:53 UTCJun 17, 13:56 UTC1h 3m
2026-06-17 SWA1937 - Jun 17, 02:30 UTCJun 17, 03:35 UTC1h 5m
2026-06-17 SWA1937 DAL → MCI Jun 17, 02:26 UTCJun 17, 03:35 UTC1h 9m
2026-06-16 SWA1937 - Jun 16, 23:40 UTCJun 17, 01:40 UTC2h 0m
2026-06-16 SWA4129 - Jun 16, 20:35 UTCJun 16, 22:35 UTC2h 0m
2026-06-16 SWA1331 - Jun 16, 16:50 UTCJun 16, 18:50 UTC2h 0m
2026-06-16 SWA1331 MDW → DAL Jun 16, 16:45 UTCJun 16, 18:45 UTC2h 0m
2026-06-16 SWA4776 DEN → SFO Jun 16, 13:30 UTCJun 16, 15:55 UTC2h 25m

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 N436WN page for operator, model, and routing details .

Mode-S A53B69 frequently asked

What is Mode-S code A53B69?
A53B69 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N436WN.
Where is Mode-S A53B69 registered?
Mode-S code A53B69 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 A53B69 broadcasting right now?
No active broadcast right now. Last signal was 21d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53B69, octal 51235551, decimal 10,828,649.
What flights does A53B69 operate?
Mode-S A53B69 has broadcast 20 distinct callsigns, including SWA826, SWA19, SWA1465, SWA1838, SWA14.