Apparatus

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sensors Mode-S transponder

A25D36

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N251WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A25D36
Octal
50456466
Decimal
10,640,694
Country
US
Tail
N251WN
Type
B737
No current signal · last broadcast 26d ago
Flights observed
485
Distinct callsigns
20
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S A25D36.

Country allocation

The ICAO 24-bit address A25D36 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
SWA3335 Southwest Airlines 12 2026-05-01
SWA1951 Southwest Airlines 6 2026-06-10
SWA2137 Southwest Airlines 5 2026-05-01
SWA2079 Southwest Airlines 5 2026-06-13
SWA4155 Southwest Airlines 4 2026-05-17
SWA3528 Southwest Airlines 4 2026-04-14
SWA2720 Southwest Airlines 4 2026-05-25
SWA1533 Southwest Airlines 4 2026-05-13
SWA1476 Southwest Airlines 4 2026-05-21
SWA1466 Southwest Airlines 4 2026-05-09
SWA1375 Southwest Airlines 4 2026-04-16
SWA1152 Southwest Airlines 4 2026-06-06
SWA1094 - 4 2026-06-15
SWA988 Southwest Airlines 3 2026-04-29
SWA736 Southwest Airlines 3 2026-04-19
SWA623 Southwest Airlines 3 2026-06-01
SWA4427 Southwest Airlines 3 2026-04-26
SWA4102 Southwest Airlines 3 2026-06-09
SWA4088 Southwest Airlines 3 2026-05-11
SWA3853 Southwest Airlines 3 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 SWA8500 - Jun 17, 13:05 UTCJun 17, 13:25 UTC20m
2026-06-17 SWA447 - Jun 17, 00:30 UTCJun 17, 01:10 UTC40m
2026-06-17 SWA447 BNA → ATL Jun 17, 00:27 UTCJun 17, 01:05 UTC38m
2026-06-16 SWA2373 - Jun 16, 20:55 UTCJun 16, 22:50 UTC1h 55m
2026-06-16 SWA2373 DEN → BNA Jun 16, 20:51 UTCJun 16, 22:50 UTC1h 59m
2026-06-16 SWA1218 ORD → AUS Jun 16, 17:05 UTCJun 16, 18:55 UTC1h 50m
2026-06-16 SWA1218 ORD → AUS Jun 16, 16:58 UTCJun 16, 18:47 UTC1h 49m
2026-06-16 SWA1218 ORD → AUS Jun 16, 15:15 UTCJun 16, 15:55 UTC40m
2026-06-16 SWA1406 DAL → TPA Jun 16, 10:45 UTCJun 16, 12:54 UTC2h 9m
2026-06-16 SWA1406 DAL → TPA Jun 16, 10:49 UTCJun 16, 12:55 UTC2h 5m
2026-06-16 SWA2173 SJC → SEA Jun 16, 02:40 UTCJun 16, 04:05 UTC1h 25m
2026-06-16 SWA2173 SJC → SEA Jun 16, 02:39 UTCJun 16, 04:00 UTC1h 21m
2026-06-16 SWA482 BWI → ALB Jun 16, 00:20 UTCJun 16, 01:04 UTC45m
2026-06-15 SWA1094 SAV → STL Jun 15, 21:55 UTCJun 15, 23:39 UTC1h 45m
2026-06-15 SWA1094 SAV → STL Jun 15, 21:51 UTCJun 15, 23:39 UTC1h 49m
2026-06-15 SWA1094 - Jun 15, 19:20 UTCJun 15, 20:40 UTC1h 20m
2026-06-15 SWA1094 - Jun 15, 17:10 UTCJun 15, 18:10 UTC1h 0m
2026-06-15 SWA3529 SNA → STL Jun 15, 15:00 UTCJun 15, 15:55 UTC55m
2026-06-15 SWA3351 - Jun 15, 11:30 UTCJun 15, 13:45 UTC2h 15m
2026-06-15 SWA3351 DAL → DCA Jun 15, 11:25 UTCJun 15, 13:41 UTC2h 16m
2026-06-15 SWA1499 - Jun 15, 00:05 UTCJun 15, 02:30 UTC2h 25m
2026-06-15 SWA1499 MCO → DAL Jun 15, 00:02 UTCJun 15, 02:28 UTC2h 26m
2026-06-14 SWA3995 MCO → PHL Jun 14, 17:55 UTCJun 14, 20:40 UTC2h 45m
2026-06-14 SWA1513 - Jun 14, 13:05 UTCJun 14, 16:40 UTC3h 35m
2026-06-14 SWA1513 BWI → STT Jun 14, 13:03 UTCJun 14, 16:45 UTC3h 42m
2026-06-14 SWA4417 - Jun 14, 10:30 UTCJun 14, 11:15 UTC45m
2026-06-13 SWA2079 LAS → OAK Jun 13, 23:55 UTCJun 14, 02:10 UTC2h 15m
2026-06-13 SWA2079 LAS → OAK Jun 13, 23:53 UTCJun 14, 02:05 UTC2h 12m
2026-06-13 SWA2079 LAS → OAK Jun 13, 20:55 UTCJun 13, 22:55 UTC2h 0m
2026-06-13 SWA30 IND → RSW Jun 13, 18:45 UTCJun 13, 19:15 UTC30m
2026-06-13 SWA1252 - Jun 13, 15:40 UTCJun 13, 16:10 UTC30m
2026-06-13 SWA3589 DCA → MCO Jun 13, 12:30 UTCJun 13, 14:20 UTC1h 50m
2026-06-13 SWA606 SFO → PHX Jun 13, 10:25 UTCJun 13, 11:25 UTC1h 0m
2026-06-12 SWA1948 SAN → LAS Jun 12, 23:25 UTCJun 13, 01:00 UTC1h 35m
2026-06-12 SWA1948 SAN → LAS Jun 12, 23:22 UTCJun 13, 01:00 UTC1h 39m
2026-06-12 SWA206 ATL → RSW Jun 12, 20:55 UTCJun 12, 22:35 UTC1h 40m
2026-06-12 SWA4482 MSY → PHX Jun 12, 16:10 UTCJun 12, 19:45 UTC3h 35m
2026-06-12 SWA4750 DEN → OAK Jun 12, 14:05 UTCJun 12, 14:55 UTC50m
2026-06-12 SWA2477 ATL → JAN Jun 12, 04:15 UTCJun 12, 05:05 UTC50m
2026-06-12 SWA2477 ATL → JAN Jun 12, 02:30 UTCJun 12, 03:15 UTC45m
2026-06-12 SWA3713 ALB → TPA Jun 12, 00:10 UTCJun 12, 01:05 UTC56m
2026-06-11 SWA3863 ISP → TPA Jun 11, 22:05 UTCJun 11, 23:00 UTC55m
2026-06-11 SWA397 SJC → LAS Jun 11, 20:10 UTCJun 11, 21:05 UTC55m
2026-06-11 SWA2432 SJC → SNA Jun 11, 18:25 UTCJun 11, 19:10 UTC45m
2026-06-11 SWA2432 SJC → SNA Jun 11, 18:20 UTCJun 11, 19:07 UTC47m
2026-06-11 SWA4903 LGA → MDW Jun 11, 16:30 UTCJun 11, 17:25 UTC55m
2026-06-11 SWA4903 LGA → MDW Jun 11, 16:25 UTCJun 11, 17:23 UTC58m
2026-06-11 SWA4935 OAK → LAX Jun 11, 14:15 UTCJun 11, 15:20 UTC1h 5m
2026-06-11 SWA1590 LGB → OAK Jun 11, 04:55 UTCJun 11, 05:30 UTC35m
2026-06-11 SWA1590 LGB → OAK Jun 11, 04:50 UTCJun 11, 05:30 UTC40m

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 N251WN page for operator, model, and routing details .

Mode-S A25D36 frequently asked

What is Mode-S code A25D36?
A25D36 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N251WN.
Where is Mode-S A25D36 registered?
Mode-S code A25D36 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 A25D36 broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25D36, octal 50456466, decimal 10,640,694.
What flights does A25D36 operate?
Mode-S A25D36 has broadcast 20 distinct callsigns, including SWA3335, SWA1951, SWA2137, SWA2079, SWA4155.