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sensors Mode-S transponder

A143C6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1805U · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
A143C6
Octal
50241706
Decimal
10,568,646
Country
US
Tail
N1805U
Type
B38M
Broadcasting now · callsign SWA588 · 1,100 ft
Flights observed
550
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A143C6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A143C6 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
SWA3840 Southwest Airlines 7 2026-06-03
SWA1851 Southwest Airlines 5 2026-06-12
SWA3094 Southwest Airlines 4 2026-06-12
SWA2978 Southwest Airlines 4 2026-05-13
SWA2888 Southwest Airlines 4 2026-06-08
SWA2785 Southwest Airlines 4 2026-05-18
SWA942 Southwest Airlines 3 2026-06-14
SWA852 Southwest Airlines 3 2026-05-15
SWA4614 - 3 2026-06-20
SWA46 Southwest Airlines 3 2026-04-15
SWA4452 Southwest Airlines 3 2026-06-13
SWA4432 Southwest Airlines 3 2026-04-18
SWA4109 Southwest Airlines 3 2026-06-05
SWA4082 - 3 2026-06-19
SWA3783 - 3 2026-07-13
SWA3605 Southwest Airlines 3 2026-05-18
SWA3576 Southwest Airlines 3 2026-05-19
SWA3516 Southwest Airlines 3 2026-04-17
SWA3491 - 3 2026-06-25
SWA3247 - 3 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SWA2316 - Jul 15, 00:00 UTCJul 15, 00:45 UTC45m
2026-07-14 SWA2316 - Jul 14, 20:05 UTCJul 14, 20:15 UTC10m
2026-07-14 SWA495 - Jul 14, 06:50 UTCJul 14, 07:15 UTC25m
2026-07-14 SWA664 LIH → HNL Jul 14, 05:11 UTCJul 14, 05:38 UTC27m
2026-07-14 SWA2349 - Jul 14, 03:40 UTCJul 14, 03:50 UTC10m
2026-07-14 SWA2349 HNL → LIH Jul 14, 03:37 UTCJul 14, 03:58 UTC21m
2026-07-14 SWA3096 - Jul 14, 01:55 UTCJul 14, 02:15 UTC20m
2026-07-14 SWA2172 KOA → OGG Jul 14, 00:00 UTCJul 14, 00:23 UTC23m
2026-07-14 SWA2172 - Jul 14, 00:00 UTCJul 14, 00:20 UTC20m
2026-07-13 SWA3783 - Jul 13, 22:00 UTCJul 13, 22:10 UTC10m
2026-07-13 SWA3783 - Jul 13, 17:15 UTCJul 13, 18:05 UTC50m
2026-07-13 SWA3783 SMF → KOA Jul 13, 17:11 UTCJul 13, 22:05 UTC4h 54m
2026-07-13 SWA2359 LAS → SMF Jul 13, 14:35 UTCJul 13, 15:40 UTC1h 5m
2026-07-13 SWA139 - Jul 13, 10:45 UTCJul 13, 11:45 UTC1h 0m
2026-07-13 SWA2515 - Jul 13, 00:25 UTCJul 13, 00:45 UTC20m
2026-07-13 SWA2515 LIH → OGG Jul 13, 00:12 UTCJul 13, 00:45 UTC33m
2026-07-12 SWA2262 - Jul 12, 16:55 UTCJul 12, 22:30 UTC5h 35m
2026-07-12 SWA2365 MCO → LAS Jul 12, 10:35 UTCJul 12, 14:35 UTC4h 0m
2026-07-12 SWA2567 - Jul 12, 02:45 UTCJul 12, 04:55 UTC2h 10m
2026-07-11 SWA3830 - Jul 11, 23:05 UTCJul 12, 01:55 UTC2h 50m
2026-07-11 SWA3830 SEA → MCI Jul 11, 23:05 UTCJul 12, 01:51 UTC2h 46m
2026-07-11 SWA4784 - Jul 11, 17:20 UTCJul 11, 21:45 UTC4h 25m
2026-07-11 SWA3461 RSW → BNA Jul 11, 14:30 UTCJul 11, 16:15 UTC1h 45m
2026-07-11 SWA3838 - Jul 11, 11:10 UTCJul 11, 13:20 UTC2h 10m
2026-07-11 SWA3622 SMF → BWI Jul 11, 05:05 UTCJul 11, 09:25 UTC4h 20m
2026-07-11 SWA3622 SMF → BWI Jul 11, 05:01 UTCJul 11, 09:27 UTC4h 26m
2026-07-11 SWA3170 - Jul 11, 02:10 UTCJul 11, 03:05 UTC55m
2026-07-11 SWA3170 ONT → SMF Jul 11, 02:06 UTCJul 11, 03:01 UTC55m
2026-07-11 SWA3808 SMF → ONT Jul 11, 00:20 UTCJul 11, 01:25 UTC1h 5m
2026-07-10 SWA3547 SAN → SMF Jul 10, 22:15 UTCJul 10, 23:25 UTC1h 10m
2026-07-10 SWA3547 SAN → SMF Jul 10, 22:15 UTCJul 10, 23:28 UTC1h 13m
2026-07-10 SWA4290 - Jul 10, 19:50 UTCJul 10, 21:05 UTC1h 15m
2026-07-10 SWA4290 SMF → SAN Jul 10, 19:50 UTCJul 10, 21:04 UTC1h 14m
2026-07-10 SWA4187 - Jul 10, 17:30 UTCJul 10, 18:45 UTC1h 15m
2026-07-10 SWA192 - Jul 10, 13:05 UTCJul 10, 15:30 UTC2h 25m
2026-07-10 SWA192 DAL → SAN Jul 10, 13:04 UTCJul 10, 15:30 UTC2h 27m
2026-07-10 SWA192 ATL → DAL Jul 10, 10:15 UTCJul 10, 11:50 UTC1h 35m
2026-07-10 SWA447 - Jul 10, 04:00 UTCJul 10, 04:40 UTC40m
2026-07-09 SWA4962 - Jul 9, 21:00 UTCJul 9, 21:50 UTC50m
2026-07-09 SWA4917 BOS → STL Jul 9, 17:25 UTCJul 9, 19:55 UTC2h 30m
2026-07-09 SWA4917 BOS → STL Jul 9, 17:25 UTCJul 9, 19:58 UTC2h 33m
2026-07-09 SWA887 - Jul 9, 15:00 UTCJul 9, 16:05 UTC1h 5m
2026-07-09 SWA887 BWI → BOS Jul 9, 14:58 UTCJul 9, 16:06 UTC1h 8m
2026-07-09 SWA2701 TPA → BWI Jul 9, 11:35 UTCJul 9, 13:30 UTC1h 55m
2026-07-09 SWA429 ORF → BWI Jul 9, 09:40 UTCJul 9, 10:15 UTC35m
2026-07-09 SWA2777 - Jul 9, 01:25 UTCJul 9, 03:50 UTC2h 25m
2026-07-09 SWA2777 MDW → FLL Jul 9, 01:20 UTCJul 9, 03:50 UTC2h 30m
2026-07-08 SWA3665 LGA → MDW Jul 8, 22:05 UTCJul 8, 23:50 UTC1h 45m
2026-07-08 SWA3665 LGA → MDW Jul 8, 22:02 UTCJul 8, 23:44 UTC1h 42m
2026-07-08 SWA4441 DEN → LGA Jul 8, 17:35 UTCJul 8, 20:50 UTC3h 15m

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 N1805U page for operator, model, and routing details .

Mode-S A143C6 frequently asked

What is Mode-S code A143C6?
A143C6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1805U.
Where is Mode-S A143C6 registered?
Mode-S code A143C6 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 A143C6 broadcasting right now?
Yes. Mode-S A143C6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A143C6, octal 50241706, decimal 10,568,646.
What flights does A143C6 operate?
Mode-S A143C6 has broadcast 20 distinct callsigns, including SWA3840, SWA1851, SWA3094, SWA2978, SWA2888.