Apparatus

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sensors Mode-S transponder

A2536F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A2536F
Octal
50451557
Decimal
10,638,191
Country
US
Tail
N249WN
Type
B737
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
658
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A2536F.

Country allocation

The ICAO 24-bit address A2536F 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
SWA149 Southwest Airlines 8 2026-07-22
SWA1276 - 7 2026-07-17
SWA3588 Southwest Airlines 6 2026-06-13
SWA2108 - 6 2026-07-01
SWA1219 Southwest Airlines 6 2026-05-12
SWA1177 Southwest Airlines 6 2026-06-01
SWA4576 Southwest Airlines 5 2026-05-13
SWA312 Southwest Airlines 5 2026-06-02
SWA2725 Southwest Airlines 5 2026-06-01
SWA184 Southwest Airlines 5 2026-04-15
SWA1037 - 5 2026-07-04
SWA667 - 4 2026-07-05
SWA500 Southwest Airlines 4 2026-05-27
SWA428 - 4 2026-07-01
SWA4273 Southwest Airlines 4 2026-06-11
SWA3623 Southwest Airlines 4 2026-06-06
SWA311 Southwest Airlines 4 2026-06-02
SWA3029 - 4 2026-04-13
SWA2832 - 4 2026-06-14
SWA2702 - 4 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4537 ORF → DAL Jul 26, 21:00 UTCJul 26, 21:45 UTC45m
2026-07-26 SWA3467 SAT → LAS Jul 26, 17:40 UTCJul 26, 19:50 UTC2h 10m
2026-07-26 SWA3016 MDW → TPA Jul 26, 14:20 UTCJul 26, 16:45 UTC2h 25m
2026-07-26 SWA3016 MDW → TPA Jul 26, 12:25 UTCJul 26, 13:10 UTC45m
2026-07-25 SWA1020 MDW → DEN Jul 25, 22:50 UTCJul 25, 23:35 UTC45m
2026-07-25 SWA1020 MDW → DEN Jul 25, 22:49 UTCJul 25, 23:28 UTC39m
2026-07-25 SWA3345 MHT → MDW Jul 25, 20:30 UTCJul 25, 21:55 UTC1h 25m
2026-07-25 SWA3345 MHT → MDW Jul 25, 20:24 UTCJul 25, 21:50 UTC1h 26m
2026-07-25 SWA2824 MCO → MSY Jul 25, 18:10 UTCJul 25, 19:15 UTC1h 5m
2026-07-25 SWA8 MDW → BOS Jul 25, 15:15 UTCJul 25, 17:05 UTC1h 50m
2026-07-25 SWA8 MDW → BOS Jul 25, 13:20 UTCJul 25, 14:05 UTC45m
2026-07-25 SWA3919 MDW → STL Jul 25, 10:30 UTCJul 25, 12:05 UTC1h 35m
2026-07-25 SWA2905 LAS → SFO Jul 25, 02:55 UTCJul 25, 03:40 UTC45m
2026-07-25 SWA2905 LAS → SFO Jul 25, 02:55 UTCJul 25, 03:36 UTC41m
2026-07-25 SWA1163 BUR → LAS Jul 25, 00:10 UTCJul 25, 01:05 UTC55m
2026-07-24 SWA9007 OKC → ATL Jul 24, 22:40 UTCJul 24, 23:25 UTC45m
2026-07-24 SWA4762 SDF → TPA Jul 24, 03:25 UTCJul 24, 05:45 UTC2h 20m
2026-07-23 SWA3656 MCO → MSY Jul 23, 22:40 UTCJul 23, 23:50 UTC1h 10m
2026-07-23 SWA3656 MCO → MSY Jul 23, 19:45 UTCJul 23, 21:20 UTC1h 35m
2026-07-23 SWA3896 MDW → PNS Jul 23, 14:03 UTCJul 23, 18:35 UTC4h 32m
2026-07-23 SWA3896 MDW → PNS Jul 23, 14:05 UTCJul 23, 18:50 UTC4h 45m
2026-07-23 SWA4513 PDX → SJC Jul 23, 03:38 UTCJul 23, 04:47 UTC1h 10m
2026-07-23 SWA4513 PDX → SJC Jul 23, 03:40 UTCJul 23, 04:50 UTC1h 10m
2026-07-23 SWA3845 HNL → LAX Jul 23, 00:55 UTCJul 23, 01:45 UTC50m
2026-07-22 SWA149 SFO → PHX Jul 22, 23:20 UTCJul 23, 00:05 UTC45m
2026-07-22 SWA149 SFO → PHX Jul 22, 21:35 UTCJul 22, 22:25 UTC50m
2026-07-22 SWA149 SFO → PHX Jul 22, 19:00 UTCJul 22, 20:20 UTC1h 20m
2026-07-22 SWA149 SFO → PHX Jul 22, 15:15 UTCJul 22, 17:50 UTC2h 35m
2026-07-22 SWA2789 ONT → OAK Jul 22, 12:55 UTCJul 22, 14:00 UTC1h 5m
2026-07-21 SWA3529 SNA → STL Jul 21, 13:40 UTCJul 21, 14:40 UTC1h 0m
2026-07-21 SWA3529 SNA → STL Jul 21, 11:00 UTCJul 21, 12:15 UTC1h 15m
2026-07-21 SWA816 CMH → BNA Jul 21, 03:00 UTCJul 21, 03:50 UTC50m
2026-07-20 SWA816 PHX → CMH Jul 20, 22:50 UTCJul 21, 02:25 UTC3h 35m
2026-07-20 SWA1795 RSW → BDL Jul 20, 17:55 UTCJul 20, 21:45 UTC3h 50m
2026-07-20 SWA1795 RSW → BDL Jul 20, 15:45 UTCJul 20, 16:55 UTC1h 10m
2026-07-20 SWA4051 TPA → GRR Jul 20, 12:55 UTCJul 20, 14:10 UTC1h 15m
2026-07-20 SWA1881 - Jul 20, 02:20 UTCJul 20, 03:30 UTC1h 10m
2026-07-19 SWA1765 BWI → MHT Jul 19, 21:45 UTCJul 20, 00:50 UTC3h 5m
2026-07-19 SWA4384 - Jul 19, 20:30 UTCJul 19, 20:40 UTC10m
2026-07-19 SWA4384 - Jul 19, 17:20 UTCJul 19, 20:40 UTC3h 20m
2026-07-19 SWA4384 DEN → JAX Jul 19, 17:18 UTCJul 19, 20:15 UTC2h 57m
2026-07-19 SWA1676 - Jul 19, 14:45 UTCJul 19, 16:05 UTC1h 20m
2026-07-19 SWA696 SJC → PDX Jul 19, 03:40 UTCJul 19, 04:50 UTC1h 10m
2026-07-19 SWA696 SJC → PDX Jul 19, 03:38 UTCJul 19, 04:46 UTC1h 8m
2026-07-19 SWA1845 - Jul 19, 01:05 UTCJul 19, 02:00 UTC55m
2026-07-18 SWA4594 BDL → BWI Jul 18, 23:20 UTCJul 19, 00:05 UTC45m
2026-07-18 SWA4594 BDL → BWI Jul 18, 23:18 UTCJul 19, 00:04 UTC46m
2026-07-18 SWA3460 LGB → OAK Jul 18, 19:35 UTCJul 18, 20:25 UTC50m
2026-07-18 SWA3460 LGB → OAK Jul 18, 19:34 UTCJul 18, 20:06 UTC32m
2026-07-18 SWA3460 LGB → OAK Jul 18, 16:35 UTCJul 18, 18:40 UTC2h 5m

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 N249WN page for operator, model, and routing details .

Mode-S A2536F frequently asked

What is Mode-S code A2536F?
A2536F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249WN.
Where is Mode-S A2536F registered?
Mode-S code A2536F 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 A2536F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2536F, octal 50451557, decimal 10,638,191.
What flights does A2536F operate?
Mode-S A2536F has broadcast 20 distinct callsigns, including SWA149, SWA1276, SWA3588, SWA2108, SWA1219.