Apparatus

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sensors Mode-S transponder

A55F31

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N445WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A55F31
Octal
51257461
Decimal
10,837,809
Country
US
Tail
N445WN
Type
B737
Broadcasting now · callsign SWA4067 · 17,375 ft
Flights observed
792
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Current position

A55F31 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A55F31 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
SWA1723 - 7 2026-06-17
SWA670 - 5 2026-07-14
SWA1416 - 5 2026-07-11
SWA969 - 4 2026-07-18
SWA893 - 4 2026-07-12
SWA4155 Southwest Airlines 4 2026-05-10
SWA3968 Southwest Airlines 4 2026-05-25
SWA3563 Southwest Airlines 4 2026-07-19
SWA345 Southwest Airlines 4 2026-06-06
SWA342 Southwest Airlines 4 2026-07-23
SWA3303 - 4 2026-07-19
SWA3078 Southwest Airlines 4 2026-05-18
SWA30 Southwest Airlines 4 2026-04-27
SWA295 Southwest Airlines 4 2026-06-05
SWA2665 Southwest Airlines 4 2026-04-17
SWA2560 Southwest Airlines 4 2026-04-26
SWA2409 Southwest Airlines 4 2026-06-03
SWA2278 Southwest Airlines 4 2026-05-26
SWA2202 - 4 2026-07-15
SWA1887 Southwest Airlines 4 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1266 LGA → MSY Jul 26, 19:35 UTCJul 26, 21:20 UTC1h 45m
2026-07-26 SWA1266 LGA → MSY Jul 26, 16:35 UTCJul 26, 18:40 UTC2h 5m
2026-07-26 SWA1828 IAH → MDW Jul 26, 12:40 UTCJul 26, 14:45 UTC2h 5m
2026-07-26 SWA3424 COS → SAT Jul 26, 03:45 UTCJul 26, 06:00 UTC2h 15m
2026-07-26 SWA3424 COS → SAT Jul 26, 03:42 UTCJul 26, 06:04 UTC2h 22m
2026-07-26 SWA2736 MDW → LGA Jul 26, 00:39 UTCJul 26, 02:40 UTC2h 2m
2026-07-26 SWA2736 MDW → LGA Jul 26, 00:40 UTCJul 26, 02:45 UTC2h 5m
2026-07-25 SWA4488 FLL → BDL Jul 25, 22:35 UTCJul 25, 23:35 UTC1h 0m
2026-07-25 SWA4488 FLL → BDL Jul 25, 22:31 UTCJul 25, 23:33 UTC1h 2m
2026-07-25 SWA4488 FLL → BDL Jul 25, 19:05 UTCJul 25, 21:10 UTC2h 5m
2026-07-25 SWA1652 PHX → MCI Jul 25, 16:50 UTCJul 25, 18:00 UTC1h 10m
2026-07-25 SWA1652 PHX → MCI Jul 25, 16:49 UTCJul 25, 17:58 UTC1h 9m
2026-07-25 SWA202 OAK → LAX Jul 25, 13:10 UTCJul 25, 15:50 UTC2h 40m
2026-07-25 SWA1948 SAN → LAS Jul 25, 00:35 UTCJul 25, 02:15 UTC1h 40m
2026-07-25 SWA1948 SAN → LAS Jul 25, 00:30 UTCJul 25, 02:09 UTC1h 39m
2026-07-24 SWA206 ATL → RSW Jul 24, 21:50 UTCJul 24, 23:25 UTC1h 35m
2026-07-24 SWA4482 MSY → PHX Jul 24, 16:40 UTCJul 24, 20:20 UTC3h 40m
2026-07-24 SWA4482 MSY → PHX Jul 24, 16:35 UTCJul 24, 20:14 UTC3h 40m
2026-07-24 SWA2125 SNA → DEN Jul 24, 11:40 UTCJul 24, 15:10 UTC3h 30m
2026-07-24 SWA1989 DEN → ORD Jul 24, 02:05 UTCJul 24, 03:55 UTC1h 50m
2026-07-24 SWA1989 DEN → ORD Jul 24, 02:03 UTCJul 24, 03:54 UTC1h 51m
2026-07-23 SWA3117 LAS → MCI Jul 23, 23:30 UTCJul 24, 00:55 UTC1h 25m
2026-07-23 SWA371 HOU → MCO Jul 23, 21:25 UTCJul 23, 22:20 UTC55m
2026-07-23 SWA371 HOU → MCO Jul 23, 21:24 UTCJul 23, 22:16 UTC52m
2026-07-23 SWA406 DAL → LAS Jul 23, 19:30 UTCJul 23, 20:30 UTC1h 0m
2026-07-23 SWA1762 BWI → ALB Jul 23, 17:00 UTCJul 23, 18:10 UTC1h 10m
2026-07-23 SWA3493 SJC → BUR Jul 23, 13:50 UTCJul 23, 15:40 UTC1h 50m
2026-07-23 SWA4265 SJC → LAX Jul 23, 04:20 UTCJul 23, 05:20 UTC1h 0m
2026-07-23 SWA342 SNA → SJC Jul 23, 02:45 UTCJul 23, 03:35 UTC50m
2026-07-23 SWA342 SNA → SJC Jul 23, 01:10 UTCJul 23, 01:45 UTC35m
2026-07-22 SWA342 SNA → SJC Jul 22, 22:05 UTCJul 22, 23:50 UTC1h 45m
2026-07-22 SWA342 SNA → SJC Jul 22, 19:05 UTCJul 22, 21:00 UTC1h 55m
2026-07-22 SWA1437 BUR → SFO Jul 22, 16:00 UTCJul 22, 18:15 UTC2h 15m
2026-07-22 SWA1437 BUR → SFO Jul 22, 15:56 UTCJul 22, 18:10 UTC2h 14m
2026-07-21 SWA3156 - Jul 21, 15:20 UTCJul 21, 18:50 UTC3h 30m
2026-07-21 SWA586 OAK → ONT Jul 21, 13:20 UTCJul 21, 14:20 UTC1h 0m
2026-07-21 SWA586 OAK → ONT Jul 21, 13:20 UTCJul 21, 14:15 UTC55m
2026-07-21 SWA2362 - Jul 21, 04:25 UTCJul 21, 05:25 UTC1h 0m
2026-07-21 SWA2362 LAS → SMF Jul 21, 04:20 UTCJul 21, 05:20 UTC1h 0m
2026-07-21 SWA3786 PWM → BWI Jul 21, 01:55 UTCJul 21, 03:20 UTC1h 25m
2026-07-20 SWA3871 SAN → PDX Jul 20, 23:40 UTCJul 21, 00:45 UTC1h 5m
2026-07-20 SWA2738 BWI → SJU Jul 20, 20:20 UTCJul 20, 21:30 UTC1h 10m
2026-07-20 SWA3546 DAL → MDW Jul 20, 17:50 UTCJul 20, 19:00 UTC1h 10m
2026-07-20 SWA3074 BOS → BWI Jul 20, 15:30 UTCJul 20, 16:43 UTC1h 13m
2026-07-20 SWA3074 BOS → BWI Jul 20, 15:30 UTCJul 20, 16:45 UTC1h 15m
2026-07-20 SWA2415 SJC → SAN Jul 20, 13:35 UTCJul 20, 14:25 UTC50m
2026-07-20 SWA254 - Jul 20, 07:20 UTCJul 20, 08:15 UTC55m
2026-07-20 SWA254 PDX → OAK Jul 20, 04:55 UTCJul 20, 06:20 UTC1h 25m
2026-07-20 SWA806 SFO → BUR Jul 20, 02:40 UTCJul 20, 03:50 UTC1h 10m
2026-07-20 SWA806 SFO → BUR Jul 20, 00:55 UTCJul 20, 01:45 UTC50m

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 N445WN page for operator, model, and routing details .

Mode-S A55F31 frequently asked

What is Mode-S code A55F31?
A55F31 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N445WN.
Where is Mode-S A55F31 registered?
Mode-S code A55F31 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 A55F31 broadcasting right now?
Yes. Mode-S A55F31 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55F31, octal 51257461, decimal 10,837,809.
What flights does A55F31 operate?
Mode-S A55F31 has broadcast 20 distinct callsigns, including SWA1723, SWA670, SWA1416, SWA969, SWA893.