Apparatus

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sensors Mode-S transponder

A23D25

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A23D25
Octal
50436445
Decimal
10,632,485
Country
US
Tail
N243WN
Type
B737
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
783
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A23D25.

Country allocation

The ICAO 24-bit address A23D25 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
SWA470 - 8 2026-07-16
SWA4333 Southwest Airlines 8 2026-06-20
SWA3472 - 7 2026-04-13
SWA3199 Southwest Airlines 6 2026-04-19
SWA169 Southwest Airlines 6 2026-04-21
SWA670 Southwest Airlines 5 2026-07-24
SWA582 - 5 2026-06-30
SWA3908 - 5 2026-04-14
SWA3877 - 5 2026-07-14
SWA2559 Southwest Airlines 5 2026-05-26
SWA250 - 5 2026-06-19
SWA2435 Southwest Airlines 5 2026-07-20
SWA2168 Southwest Airlines 5 2026-05-22
SWA133 - 5 2026-07-13
SWA897 - 4 2026-07-06
SWA747 Southwest Airlines 4 2026-05-23
SWA54 Southwest Airlines 4 2026-06-12
SWA4923 Southwest Airlines 4 2026-07-24
SWA4270 Southwest Airlines 4 2026-05-15
SWA4007 Southwest Airlines 4 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3033 DEN → LGA Jul 26, 20:45 UTCJul 26, 21:15 UTC30m
2026-07-26 SWA4996 RNO → PHX Jul 26, 17:45 UTCJul 26, 19:30 UTC1h 45m
2026-07-26 SWA3827 PVD → FLL Jul 26, 14:15 UTCJul 26, 16:20 UTC2h 5m
2026-07-26 SWA1109 SJC → LAX Jul 26, 11:25 UTCJul 26, 13:10 UTC1h 45m
2026-07-25 SWA324 STL → DAL Jul 25, 23:50 UTCJul 26, 01:55 UTC2h 5m
2026-07-25 SWA121 MCO → MSY Jul 25, 20:05 UTCJul 25, 22:55 UTC2h 50m
2026-07-25 SWA121 MCO → MSY Jul 25, 20:00 UTCJul 25, 22:50 UTC2h 51m
2026-07-25 SWA254 OAK → SNA Jul 25, 18:05 UTCJul 25, 19:05 UTC1h 0m
2026-07-25 SWA254 OAK → SNA Jul 25, 18:01 UTCJul 25, 19:04 UTC1h 3m
2026-07-25 SWA1806 LIH → SJC Jul 25, 15:05 UTCJul 25, 17:10 UTC2h 5m
2026-07-25 SWA1806 LIH → SJC Jul 25, 15:00 UTCJul 25, 17:09 UTC2h 9m
2026-07-25 SWA1806 LIH → SJC Jul 25, 13:30 UTCJul 25, 14:00 UTC30m
2026-07-25 SWA2124 BUR → SFO Jul 25, 00:35 UTCJul 25, 02:30 UTC1h 55m
2026-07-24 SWA4923 BUF → BWI Jul 24, 21:20 UTCJul 24, 23:20 UTC2h 0m
2026-07-24 SWA4923 BUF → BWI Jul 24, 21:17 UTCJul 24, 23:17 UTC2h 0m
2026-07-24 SWA599 OAK → LAS Jul 24, 18:30 UTCJul 24, 19:15 UTC45m
2026-07-24 SWA600 RNO → OAK Jul 24, 16:05 UTCJul 24, 16:35 UTC30m
2026-07-24 SWA4854 MSY → FLL Jul 24, 11:10 UTCJul 24, 14:30 UTC3h 20m
2026-07-24 SWA4854 MSY → FLL Jul 24, 11:09 UTCJul 24, 14:27 UTC3h 18m
2026-07-24 SWA670 SJC → BOI Jul 24, 01:00 UTCJul 24, 03:10 UTC2h 10m
2026-07-23 SWA670 SJC → BOI Jul 23, 22:50 UTCJul 23, 23:50 UTC1h 0m
2026-07-23 SWA670 SJC → BOI Jul 23, 21:05 UTCJul 23, 21:55 UTC50m
2026-07-23 SWA670 SJC → BOI Jul 23, 16:45 UTCJul 23, 20:05 UTC3h 20m
2026-07-23 SWA670 SJC → BOI Jul 23, 15:25 UTCJul 23, 15:55 UTC30m
2026-07-23 SWA1785 LAS → SFO Jul 23, 12:55 UTCJul 23, 14:10 UTC1h 15m
2026-07-23 SWA168 BUR → SJC Jul 23, 00:05 UTCJul 23, 00:55 UTC50m
2026-07-22 SWA4425 - Jul 22, 21:00 UTCJul 22, 22:35 UTC1h 35m
2026-07-22 SWA4425 SRQ → BNA Jul 22, 20:55 UTCJul 22, 22:30 UTC1h 35m
2026-07-22 SWA4913 BWI → BOS Jul 22, 18:05 UTCJul 22, 20:00 UTC1h 55m
2026-07-22 SWA4913 BWI → BOS Jul 22, 18:00 UTCJul 22, 20:02 UTC2h 2m
2026-07-22 SWA4049 DEN → MCO Jul 22, 15:00 UTCJul 22, 16:55 UTC1h 55m
2026-07-22 SWA4049 DEN → MCO Jul 22, 14:56 UTCJul 22, 16:58 UTC2h 2m
2026-07-22 SWA4796 CMH → MCO Jul 22, 11:45 UTCJul 22, 14:00 UTC2h 15m
2026-07-22 SWA2453 LAS → ELP Jul 22, 02:51 UTCJul 22, 03:34 UTC43m
2026-07-22 SWA2453 LAS → ELP Jul 22, 02:55 UTCJul 22, 03:35 UTC40m
2026-07-22 SWA792 - Jul 22, 00:15 UTCJul 22, 01:30 UTC1h 15m
2026-07-22 SWA792 CLE → STL Jul 22, 00:10 UTCJul 22, 01:28 UTC1h 19m
2026-07-21 SWA30 LAS → CLE Jul 21, 19:30 UTCJul 21, 23:00 UTC3h 30m
2026-07-21 SWA9 - Jul 21, 17:35 UTCJul 21, 18:15 UTC40m
2026-07-21 SWA973 - Jul 21, 15:55 UTCJul 21, 16:40 UTC45m
2026-07-21 SWA973 - Jul 21, 14:00 UTCJul 21, 14:55 UTC55m
2026-07-21 SWA843 OAK → BUR Jul 21, 04:15 UTCJul 21, 05:00 UTC45m
2026-07-21 SWA263 MCI → LGA Jul 21, 01:59 UTCJul 21, 02:50 UTC51m
2026-07-21 SWA263 MCI → LGA Jul 21, 02:00 UTCJul 21, 02:55 UTC55m
2026-07-21 SWA806 SFO → BUR Jul 21, 00:20 UTCJul 21, 01:10 UTC50m
2026-07-21 SWA806 SFO → BUR Jul 21, 00:18 UTCJul 21, 01:05 UTC47m
2026-07-20 SWA3638 SFO → BUR Jul 20, 23:00 UTCJul 20, 23:50 UTC50m
2026-07-20 SWA3334 - Jul 20, 20:00 UTCJul 20, 21:30 UTC1h 30m
2026-07-20 SWA3207 OAK → BUR Jul 20, 16:40 UTCJul 20, 18:55 UTC2h 15m
2026-07-20 SWA3693 SJC → PDX Jul 20, 14:00 UTCJul 20, 15:15 UTC1h 15m

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 N243WN page for operator, model, and routing details .

Mode-S A23D25 frequently asked

What is Mode-S code A23D25?
A23D25 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243WN.
Where is Mode-S A23D25 registered?
Mode-S code A23D25 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 A23D25 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23D25, octal 50436445, decimal 10,632,485.
What flights does A23D25 operate?
Mode-S A23D25 has broadcast 20 distinct callsigns, including SWA470, SWA4333, SWA3472, SWA3199, SWA169.