Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign SWA949 · 41,000 ft
Flights observed
759
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Current position

A55055 is currently broadcasting. Map zoomed to live position.

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
SWA1577 - 7 2026-07-15
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA776 PHX → DAL Jul 26, 18:45 UTCJul 26, 21:00 UTC2h 15m
2026-07-26 SWA925 BOS → MDW Jul 26, 15:50 UTCJul 26, 17:50 UTC2h 0m
2026-07-25 SWA3492 OAK → LGB Jul 25, 03:25 UTCJul 25, 06:00 UTC2h 35m
2026-07-25 SWA3652 MCO → MHT Jul 25, 00:55 UTCJul 25, 02:15 UTC1h 20m
2026-07-24 SWA3168 ATL → PHL Jul 24, 22:50 UTCJul 24, 23:40 UTC50m
2026-07-24 SWA3168 ATL → PHL Jul 24, 19:40 UTCJul 24, 20:25 UTC45m
2026-07-24 SWA3708 PHL → DEN Jul 24, 17:35 UTCJul 24, 18:20 UTC45m
2026-07-24 SWA3708 PHL → DEN Jul 24, 17:34 UTCJul 24, 18:18 UTC44m
2026-07-24 SWA3708 PHL → DEN Jul 24, 15:35 UTCJul 24, 16:40 UTC1h 5m
2026-07-24 SWA2430 - Jul 24, 13:45 UTCJul 24, 14:30 UTC45m
2026-07-24 SWA3110 BNA → MDW Jul 24, 04:35 UTCJul 24, 06:30 UTC1h 55m
2026-07-24 SWA1743 BWI → MHT Jul 24, 00:05 UTCJul 24, 03:10 UTC3h 5m
2026-07-24 SWA1743 BWI → MHT Jul 24, 00:03 UTCJul 24, 03:10 UTC3h 7m
2026-07-23 SWA4793 LAS → DCA Jul 23, 20:30 UTCJul 23, 21:35 UTC1h 5m
2026-07-23 SWA936 RDU → BWI Jul 23, 17:00 UTCJul 23, 17:15 UTC15m
2026-07-23 SWA936 RDU → BWI Jul 23, 16:55 UTCJul 23, 19:13 UTC2h 19m
2026-07-23 SWA4605 TPA → RDU Jul 23, 14:30 UTCJul 23, 16:00 UTC1h 30m
2026-07-23 SWA4605 TPA → RDU Jul 23, 14:29 UTCJul 23, 15:55 UTC1h 26m
2026-07-23 SWA683 BNA → TPA Jul 23, 12:10 UTCJul 23, 13:40 UTC1h 30m
2026-07-23 SWA1337 SJC → GEG Jul 23, 00:55 UTCJul 23, 02:05 UTC1h 10m
2026-07-22 SWA1337 SJC → GEG Jul 22, 23:35 UTCJul 23, 00:10 UTC35m
2026-07-22 SWA1063 LAS → OAK Jul 22, 21:30 UTCJul 22, 22:25 UTC55m
2026-07-22 SWA294 HOU → ELP Jul 22, 17:55 UTCJul 22, 19:25 UTC1h 30m
2026-07-22 SWA2860 BNA → RSW Jul 22, 14:55 UTCJul 22, 17:10 UTC2h 15m
2026-07-22 SWA2860 BNA → RSW Jul 22, 14:50 UTCJul 22, 17:02 UTC2h 12m
2026-07-22 SWA4459 LAS → OKC Jul 22, 11:20 UTCJul 22, 13:45 UTC2h 25m
2026-07-21 SWA1353 TPA → HOU Jul 21, 22:35 UTCJul 22, 00:50 UTC2h 15m
2026-07-21 SWA3434 - Jul 21, 19:55 UTCJul 21, 20:40 UTC45m
2026-07-21 SWA3434 SAT → DAL Jul 21, 19:50 UTCJul 21, 20:39 UTC49m
2026-07-21 SWA3149 - Jul 21, 17:05 UTCJul 21, 18:50 UTC1h 45m
2026-07-21 SWA1828 EUG → DEN Jul 21, 14:00 UTCJul 21, 16:05 UTC2h 5m
2026-07-21 SWA3821 BWI → PWM Jul 21, 03:35 UTCJul 21, 05:45 UTC2h 10m
2026-07-21 SWA3570 - Jul 21, 01:10 UTCJul 21, 02:30 UTC1h 20m
2026-07-20 SWA4970 - Jul 20, 20:15 UTCJul 20, 22:50 UTC2h 35m
2026-07-20 SWA2563 SRQ → ATL Jul 20, 16:35 UTCJul 20, 19:00 UTC2h 25m
2026-07-20 SWA2563 SRQ → ATL Jul 20, 16:34 UTCJul 20, 18:50 UTC2h 16m
2026-07-20 SWA2563 SRQ → ATL Jul 20, 13:15 UTCJul 20, 15:25 UTC2h 10m
2026-07-20 SWA3231 CVG → MDW Jul 20, 03:45 UTCJul 20, 05:20 UTC1h 35m
2026-07-20 SWA3231 CVG → MDW Jul 20, 01:15 UTCJul 20, 02:45 UTC1h 30m
2026-07-19 SWA4769 - Jul 19, 21:35 UTCJul 19, 23:50 UTC2h 15m
2026-07-19 SWA4769 SAN → SEA Jul 19, 21:34 UTCJul 19, 23:45 UTC2h 12m
2026-07-19 SWA1204 LAS → SAN Jul 19, 19:25 UTCJul 19, 20:10 UTC45m
2026-07-19 SWA1185 - Jul 19, 15:20 UTCJul 19, 16:10 UTC50m
2026-07-19 SWA3545 - Jul 19, 11:35 UTCJul 19, 13:55 UTC2h 20m
2026-07-19 SWA3511 BNA → PHL Jul 19, 02:30 UTCJul 19, 05:05 UTC2h 35m
2026-07-19 SWA2459 - Jul 19, 00:30 UTCJul 19, 01:30 UTC1h 0m
2026-07-19 SWA2459 PHX → LAX Jul 19, 00:31 UTCJul 19, 01:24 UTC53m
2026-07-18 SWA4805 MCO → BDL Jul 18, 21:45 UTCJul 18, 23:10 UTC1h 25m
2026-07-18 SWA3540 - Jul 18, 19:10 UTCJul 18, 20:25 UTC1h 15m
2026-07-18 SWA982 - Jul 18, 02:29 UTCJul 18, 04:45 UTC2h 16m

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?
Yes. Mode-S A55055 is currently airborne.
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 SWA1577, SWA155, SWA1191, SWA372, SWA2990.