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 Jul 26, 21:35 UTC
Flights observed
555
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

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
SWA553 Southwest Airlines 4 2026-07-25
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
SWA3111 Southwest Airlines 4 2026-07-23
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1184 BUR → SFO Jul 26, 20:50 UTCJul 26, 21:35 UTC45m
2026-07-26 SWA1779 FAT → LAS Jul 26, 15:25 UTCJul 26, 19:00 UTC3h 35m
2026-07-26 SWA2426 ONT → SJC Jul 26, 13:30 UTCJul 26, 14:30 UTC1h 0m
2026-07-26 SWA1100 OAK → LAS Jul 26, 04:45 UTCJul 26, 05:50 UTC1h 5m
2026-07-26 SWA1300 OAK → DEN Jul 26, 01:00 UTCJul 26, 03:20 UTC2h 20m
2026-07-25 SWA1300 OAK → DEN Jul 25, 21:20 UTCJul 26, 00:00 UTC2h 40m
2026-07-25 SWA553 DCA → ATL Jul 25, 17:40 UTCJul 25, 19:55 UTC2h 15m
2026-07-25 SWA553 DCA → ATL Jul 25, 17:36 UTCJul 25, 19:55 UTC2h 19m
2026-07-25 SWA553 DCA → ATL Jul 25, 15:25 UTCJul 25, 16:15 UTC50m
2026-07-25 SWA553 DCA → ATL Jul 25, 13:10 UTCJul 25, 14:35 UTC1h 25m
2026-07-25 SWA1757 PVD → BWI Jul 25, 11:20 UTCJul 25, 12:00 UTC40m
2026-07-25 SWA1757 PVD → BWI Jul 25, 11:19 UTCJul 25, 11:51 UTC32m
2026-07-25 SWA156 SJC → LAS Jul 25, 03:00 UTCJul 25, 04:15 UTC1h 15m
2026-07-25 SWA1290 BWI → BDL Jul 25, 00:45 UTCJul 25, 02:10 UTC1h 25m
2026-07-24 SWA1290 BWI → BDL Jul 24, 22:00 UTCJul 24, 23:55 UTC1h 55m
2026-07-24 SWA194 DEN → SFO Jul 24, 19:10 UTCJul 24, 20:55 UTC1h 45m
2026-07-24 SWA194 DEN → SFO Jul 24, 16:15 UTCJul 24, 17:30 UTC1h 15m
2026-07-24 SWA2542 HNL → OAK Jul 24, 12:55 UTCJul 24, 15:00 UTC2h 5m
2026-07-24 SWA4387 SJC → BUR Jul 24, 03:20 UTCJul 24, 04:25 UTC1h 5m
2026-07-24 SWA1859 BDL → BWI Jul 24, 02:25 UTCJul 24, 02:30 UTC5m
2026-07-23 SWA1859 BDL → BWI Jul 23, 23:20 UTCJul 24, 02:20 UTC3h 0m
2026-07-23 SWA2165 SJC → PDX Jul 23, 21:30 UTCJul 23, 22:25 UTC55m
2026-07-23 SWA2929 BNA → SAV Jul 23, 14:40 UTCJul 23, 16:35 UTC1h 55m
2026-07-23 SWA3111 PHX → OKC Jul 23, 11:20 UTCJul 23, 12:15 UTC55m
2026-07-23 SWA3111 PHX → OKC Jul 23, 11:19 UTCJul 23, 12:30 UTC1h 11m
2026-07-23 SWA962 TPA → BDL Jul 23, 03:45 UTCJul 23, 04:15 UTC30m
2026-07-23 SWA962 TPA → BDL Jul 23, 03:44 UTCJul 23, 04:16 UTC32m
2026-07-23 SWA241 SAN → PHX Jul 23, 01:20 UTCJul 23, 02:45 UTC1h 25m
2026-07-23 SWA241 SAN → PHX Jul 23, 01:17 UTCJul 23, 02:46 UTC1h 29m
2026-07-22 SWA816 LAS → COS Jul 22, 21:20 UTCJul 22, 23:25 UTC2h 5m
2026-07-22 SWA284 ATL → DEN Jul 22, 18:20 UTCJul 22, 20:10 UTC1h 50m
2026-07-22 SWA284 ATL → DEN Jul 22, 16:10 UTCJul 22, 17:05 UTC55m
2026-07-22 SWA284 ATL → DEN Jul 22, 13:20 UTCJul 22, 15:00 UTC1h 40m
2026-07-22 SWA3267 BUR → OAK Jul 22, 10:20 UTCJul 22, 11:45 UTC1h 25m
2026-07-22 SWA3267 BUR → OAK Jul 22, 09:15 UTCJul 22, 11:40 UTC2h 25m
2026-07-21 SWA2210 SJC → PHX Jul 21, 23:50 UTCJul 22, 01:55 UTC2h 5m
2026-07-21 SWA2210 SJC → PHX Jul 21, 23:45 UTCJul 22, 01:41 UTC1h 56m
2026-07-21 SWA8503 - Jul 21, 18:55 UTCJul 21, 19:25 UTC30m
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

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 Jul 26, 21:35 UTC.
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.