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sensors Mode-S transponder

A2685B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N254WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A2685B
Octal
50464133
Decimal
10,643,547
Country
US
Tail
N254WN
Type
B737
No current signal · last broadcast 1h ago
Flights observed
620
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A2685B.

Country allocation

The ICAO 24-bit address A2685B 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
SWA30 Southwest Airlines 8 2026-05-11
SWA1219 Southwest Airlines 7 2026-05-15
SWA2137 Southwest Airlines 6 2026-05-26
SWA2127 - 6 2026-06-13
SWA1989 - 6 2026-07-14
SWA380 Southwest Airlines 5 2026-06-06
SWA1082 Southwest Airlines 5 2026-04-17
SWA1057 - 5 2026-06-22
SWA8509 Southwest Airlines 4 2026-04-18
SWA781 Southwest Airlines 4 2026-04-26
SWA775 Southwest Airlines 4 2026-04-16
SWA4758 Southwest Airlines 4 2026-06-09
SWA4677 Southwest Airlines 4 2026-05-03
SWA421 Southwest Airlines 4 2026-04-14
SWA4157 Southwest Airlines 4 2026-05-30
SWA2973 Southwest Airlines 4 2026-05-08
SWA2570 - 4 2026-06-26
SWA2374 Southwest Airlines 4 2026-05-24
SWA154 Southwest Airlines 4 2026-04-30
SWA1476 - 4 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA1989 - Jul 14, 01:55 UTCJul 14, 02:45 UTC50m
2026-07-13 SWA2785 - Jul 13, 22:55 UTCJul 14, 00:55 UTC2h 0m
2026-07-13 SWA2930 - Jul 13, 19:10 UTCJul 13, 21:50 UTC2h 40m
2026-07-13 SWA2930 MIA → MDW Jul 13, 19:09 UTCJul 13, 21:49 UTC2h 41m
2026-07-13 SWA2575 - Jul 13, 15:15 UTCJul 13, 18:00 UTC2h 45m
2026-07-13 SWA2575 MCI → MIA Jul 13, 15:11 UTCJul 13, 17:56 UTC2h 45m
2026-07-13 SWA3943 - Jul 13, 13:15 UTCJul 13, 13:55 UTC40m
2026-07-13 SWA3943 STL → MCI Jul 13, 13:16 UTCJul 13, 13:54 UTC38m
2026-07-13 SWA1109 - Jul 13, 10:35 UTCJul 13, 12:15 UTC1h 40m
2026-07-13 SWA1917 MCO → BWI Jul 13, 02:10 UTCJul 13, 04:05 UTC1h 55m
2026-07-12 SWA2818 - Jul 12, 22:40 UTCJul 13, 00:50 UTC2h 10m
2026-07-12 SWA4479 DCA → MDW Jul 12, 20:10 UTCJul 12, 21:40 UTC1h 30m
2026-07-12 SWA4380 - Jul 12, 17:15 UTCJul 12, 18:40 UTC1h 25m
2026-07-12 SWA2407 LGA → BNA Jul 12, 14:01 UTCJul 12, 15:45 UTC1h 45m
2026-07-12 SWA645 STL → LGA Jul 12, 10:50 UTCJul 12, 12:45 UTC1h 55m
2026-07-12 SWA2905 - Jul 12, 02:20 UTCJul 12, 02:45 UTC25m
2026-07-12 SWA2905 MDW → STL Jul 12, 02:16 UTCJul 12, 02:56 UTC40m
2026-07-11 SWA4746 LGA → MDW Jul 11, 23:35 UTCJul 12, 01:25 UTC1h 50m
2026-07-11 SWA2804 - Jul 11, 19:25 UTCJul 11, 21:40 UTC2h 15m
2026-07-11 SWA2804 BUR → MDW Jul 11, 14:35 UTCJul 11, 18:05 UTC3h 30m
2026-07-11 SWA2202 LAS → BUR Jul 11, 03:55 UTCJul 11, 04:35 UTC40m
2026-07-11 SWA2202 ONT → AUS Jul 11, 03:51 UTCJul 11, 04:33 UTC42m
2026-07-11 SWA4370 BUR → LAS Jul 11, 02:10 UTCJul 11, 02:55 UTC45m
2026-07-10 SWA697 - Jul 10, 23:40 UTCJul 11, 01:20 UTC1h 40m
2026-07-10 SWA803 OAK → BOI Jul 10, 21:26 UTCJul 10, 22:30 UTC1h 4m
2026-07-10 SWA803 - Jul 10, 21:30 UTCJul 10, 22:35 UTC1h 5m
2026-07-10 SWA803 BUR → OAK Jul 10, 19:10 UTCJul 10, 20:00 UTC50m
2026-07-10 SWA2198 LAS → BUR Jul 10, 17:10 UTCJul 10, 17:50 UTC40m
2026-07-10 SWA4296 - Jul 10, 14:50 UTCJul 10, 15:40 UTC50m
2026-07-10 SWA4296 SNA → LAS Jul 10, 14:50 UTCJul 10, 15:32 UTC42m
2026-07-10 SWA3210 - Jul 10, 02:45 UTCJul 10, 03:45 UTC1h 0m
2026-07-10 SWA3210 SJC → SNA Jul 10, 02:41 UTCJul 10, 03:39 UTC58m
2026-07-10 SWA3210 - Jul 10, 00:35 UTCJul 10, 02:00 UTC1h 25m
2026-07-09 SWA2433 - Jul 9, 22:10 UTCJul 9, 23:35 UTC1h 25m
2026-07-09 SWA2433 - Jul 9, 20:25 UTCJul 9, 21:10 UTC45m
2026-07-09 SWA2433 - Jul 9, 15:20 UTCJul 9, 19:05 UTC3h 45m
2026-07-09 SWA4202 - Jul 9, 12:50 UTCJul 9, 14:25 UTC1h 35m
2026-07-09 SWA4202 - Jul 9, 12:10 UTCJul 9, 12:40 UTC30m
2026-07-09 SWA3966 STL → PHL Jul 9, 00:35 UTCJul 9, 02:20 UTC1h 45m
2026-07-08 SWA298 - Jul 8, 22:05 UTCJul 8, 23:15 UTC1h 10m
2026-07-08 SWA298 MSP → STL Jul 8, 22:04 UTCJul 8, 23:12 UTC1h 8m
2026-07-08 SWA1638 DEN → MSP Jul 8, 19:35 UTCJul 8, 21:05 UTC1h 30m
2026-07-08 SWA2364 LGA → DEN Jul 8, 14:50 UTCJul 8, 18:20 UTC3h 30m
2026-07-08 SWA2364 LGA → DEN Jul 8, 14:48 UTCJul 8, 18:15 UTC3h 27m
2026-07-08 SWA2735 - Jul 8, 11:40 UTCJul 8, 13:40 UTC2h 0m
2026-07-08 SWA2191 LAS → BNA Jul 8, 06:35 UTCJul 8, 09:45 UTC3h 10m
2026-07-08 SWA8508 - Jul 8, 03:05 UTCJul 8, 05:10 UTC2h 5m
2026-07-08 SWA8508 PAE → LAS Jul 8, 03:02 UTCJul 8, 05:06 UTC2h 5m
2026-07-01 SWA8507 - Jul 1, 01:05 UTCJul 1, 03:20 UTC2h 15m
2026-06-30 SWA873 - Jun 30, 23:30 UTCJul 1, 00:10 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 N254WN page for operator, model, and routing details .

Mode-S A2685B frequently asked

What is Mode-S code A2685B?
A2685B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N254WN.
Where is Mode-S A2685B registered?
Mode-S code A2685B 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 A2685B broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2685B, octal 50464133, decimal 10,643,547.
What flights does A2685B operate?
Mode-S A2685B has broadcast 20 distinct callsigns, including SWA30, SWA1219, SWA2137, SWA2127, SWA1989.