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sensors Mode-S transponder

A55055

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N441WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A55055
Octal
51250125
Decimal
10,834,005
Country
US
Tail
N441WN
Type
B737
No current signal · last broadcast 1h ago
Flights observed
682
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A55055.

Country allocation

The ICAO 24-bit address A55055 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
SWA155 Southwest Airlines 7 2026-04-24
SWA1191 - 7 2026-06-21
SWA372 Southwest Airlines 6 2026-06-27
SWA2990 Southwest Airlines 6 2026-05-20
SWA2154 Southwest Airlines 6 2026-06-08
SWA1758 Southwest Airlines 6 2026-05-25
SWA425 - 5 2026-07-12
SWA2857 Southwest Airlines 5 2026-05-30
SWA2087 - 5 2026-04-15
SWA1507 - 5 2026-06-17
SWA1206 - 5 2026-06-17
SWA1080 Southwest Airlines 5 2026-04-29
SWA957 Southwest Airlines 4 2026-05-27
SWA758 - 4 2026-07-11
SWA4294 - 4 2026-07-03
SWA4157 Southwest Airlines 4 2026-07-04
SWA3706 Southwest Airlines 4 2026-05-11
SWA3689 Southwest Airlines 4 2026-04-13
SWA3224 - 4 2026-06-30
SWA2379 Southwest Airlines 4 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SWA1295 - Jul 15, 03:15 UTCJul 15, 05:15 UTC2h 0m
2026-07-15 SWA971 - Jul 15, 00:00 UTCJul 15, 02:10 UTC2h 10m
2026-07-14 SWA971 - Jul 14, 20:20 UTCJul 14, 21:50 UTC1h 30m
2026-07-14 SWA4863 - Jul 14, 17:10 UTCJul 14, 17:55 UTC45m
2026-07-14 SWA4863 ALB → BWI Jul 14, 17:07 UTCJul 14, 17:55 UTC48m
2026-07-14 SWA4863 - Jul 14, 13:45 UTCJul 14, 16:10 UTC2h 25m
2026-07-14 SWA4679 - Jul 14, 10:50 UTCJul 14, 12:30 UTC1h 40m
2026-07-14 SWA156 - Jul 14, 04:30 UTCJul 14, 05:40 UTC1h 10m
2026-07-14 SWA1290 - Jul 14, 02:35 UTCJul 14, 05:15 UTC2h 40m
2026-07-14 SWA1290 SAV → BWI Jul 14, 02:35 UTCJul 14, 03:53 UTC1h 18m
2026-07-13 SWA1290 - Jul 13, 23:45 UTCJul 14, 01:55 UTC2h 10m
2026-07-13 SWA194 ATL → DAL Jul 13, 19:55 UTCJul 13, 21:35 UTC1h 40m
2026-07-13 SWA194 - Jul 13, 17:10 UTCJul 13, 18:30 UTC1h 20m
2026-07-13 SWA194 - Jul 13, 16:50 UTCJul 13, 17:15 UTC25m
2026-07-13 SWA2569 - Jul 13, 14:15 UTCJul 13, 15:35 UTC1h 20m
2026-07-13 SWA3016 - Jul 13, 12:20 UTCJul 13, 13:00 UTC40m
2026-07-13 SWA2756 - Jul 13, 00:30 UTCJul 13, 01:10 UTC40m
2026-07-13 SWA2756 MDW → CVG Jul 13, 00:26 UTCJul 13, 01:10 UTC44m
2026-07-12 SWA425 - Jul 12, 21:25 UTCJul 12, 22:50 UTC1h 25m
2026-07-12 SWA425 BHM → MDW Jul 12, 21:23 UTCJul 12, 22:45 UTC1h 23m
2026-07-12 SWA425 - Jul 12, 18:50 UTCJul 12, 20:05 UTC1h 15m
2026-07-12 SWA1233 - Jul 12, 16:50 UTCJul 12, 17:25 UTC35m
2026-07-12 SWA1233 CRP → HOU Jul 12, 16:50 UTCJul 12, 17:23 UTC34m
2026-07-12 SWA1578 - Jul 12, 15:20 UTCJul 12, 15:55 UTC35m
2026-07-12 SWA1578 - Jul 12, 13:10 UTCJul 12, 13:50 UTC40m
2026-07-12 SWA1559 - Jul 12, 10:10 UTCJul 12, 11:50 UTC1h 40m
2026-07-12 SWA1870 - Jul 12, 00:10 UTCJul 12, 02:40 UTC2h 30m
2026-07-11 SWA4735 - Jul 11, 21:25 UTCJul 11, 23:15 UTC1h 50m
2026-07-11 SWA4735 BWI → FLL Jul 11, 21:21 UTCJul 11, 23:21 UTC2h 0m
2026-07-11 SWA3685 - Jul 11, 19:15 UTCJul 11, 20:10 UTC55m
2026-07-11 SWA3685 ALB → BWI Jul 11, 19:11 UTCJul 11, 20:08 UTC57m
2026-07-11 SWA4818 - Jul 11, 17:15 UTCJul 11, 18:10 UTC55m
2026-07-11 SWA4818 BWI → ALB Jul 11, 17:15 UTCJul 11, 18:17 UTC1h 2m
2026-07-11 SWA758 - Jul 11, 15:10 UTCJul 11, 16:00 UTC50m
2026-07-11 SWA758 - Jul 11, 13:00 UTCJul 11, 14:00 UTC1h 0m
2026-07-11 SWA573 - Jul 11, 10:25 UTCJul 11, 11:35 UTC1h 10m
2026-07-11 SWA4006 TPA → BNA Jul 11, 02:45 UTCJul 11, 04:15 UTC1h 30m
2026-07-11 SWA1997 - Jul 11, 01:10 UTCJul 11, 01:45 UTC35m
2026-07-10 SWA1997 - Jul 10, 21:30 UTCJul 11, 00:20 UTC2h 50m
2026-07-10 SWA159 ALB → BWI Jul 10, 19:12 UTCJul 10, 20:08 UTC57m
2026-07-10 SWA159 - Jul 10, 16:35 UTCJul 10, 18:20 UTC1h 45m
2026-07-10 SWA2604 - Jul 10, 13:50 UTCJul 10, 15:25 UTC1h 35m
2026-07-10 SWA4146 AUS → MCO Jul 10, 10:35 UTCJul 10, 12:45 UTC2h 10m
2026-07-10 SWA1481 DEN → AUS Jul 10, 04:35 UTCJul 10, 06:15 UTC1h 40m
2026-07-10 SWA1481 DEN → AUS Jul 10, 04:35 UTCJul 10, 06:13 UTC1h 38m
2026-07-10 SWA2573 AUS → DEN Jul 10, 01:15 UTCJul 10, 03:30 UTC2h 15m
2026-07-09 SWA1285 LAS → AUS Jul 9, 20:35 UTCJul 9, 22:50 UTC2h 15m
2026-07-09 SWA1285 SMF → LAS Jul 9, 18:15 UTCJul 9, 19:15 UTC1h 0m
2026-07-09 SWA2638 BUR → SMF Jul 9, 16:25 UTCJul 9, 17:20 UTC55m
2026-07-09 SWA3442 - Jul 9, 14:10 UTCJul 9, 15:05 UTC55m

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 N441WN page for operator, model, and routing details .

Mode-S A55055 frequently asked

What is Mode-S code A55055?
A55055 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N441WN.
Where is Mode-S A55055 registered?
Mode-S code A55055 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 A55055 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 A55055, octal 51250125, decimal 10,834,005.
What flights does A55055 operate?
Mode-S A55055 has broadcast 20 distinct callsigns, including SWA155, SWA1191, SWA372, SWA2990, SWA2154.