Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A146F1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1811U · operated by SOUTHWEST AIRLINES CO

Hex
A146F1
Octal
50243361
Decimal
10,569,457
Country
US
Tail
N1811U
Type
B38M
No current signal · last broadcast 38m ago
Flights observed
576
Distinct callsigns
20
Country
US
Last broadcast
38m ago

Last known position

Most recent position reported by Mode-S A146F1.

Country allocation

The ICAO 24-bit address A146F1 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
SWA2122 - 7 2026-07-08
SWA2328 Southwest Airlines 6 2026-06-05
SWA4994 Southwest Airlines 4 2026-06-29
SWA1865 - 4 2026-07-01
SWA1642 - 4 2026-06-16
SWA1178 Southwest Airlines 4 2026-04-25
SWA1013 - 4 2026-07-12
SWA837 - 3 2026-07-02
SWA4279 Southwest Airlines 3 2026-05-24
SWA4141 - 3 2026-07-12
SWA4109 Southwest Airlines 3 2026-06-04
SWA3722 - 3 2026-07-03
SWA3704 Southwest Airlines 3 2026-05-26
SWA3600 Southwest Airlines 3 2026-04-27
SWA3202 Southwest Airlines 3 2026-05-24
SWA2982 Southwest Airlines 3 2026-04-27
SWA2836 - 3 2026-07-11
SWA2744 Southwest Airlines 3 2026-05-04
SWA2725 Southwest Airlines 3 2026-05-27
SWA2603 Southwest Airlines 3 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 SWA1928 SNA → SJC Jul 18, 07:45 UTCJul 18, 08:00 UTC15m
2026-07-17 SWA2397 LAX → MCI Jul 17, 21:15 UTCJul 17, 21:30 UTC15m
2026-07-17 SWA2397 LAX → MCI Jul 17, 16:10 UTCJul 17, 16:40 UTC30m
2026-07-17 SWA2397 LAX → MCI Jul 17, 16:08 UTCJul 17, 21:29 UTC5h 21m
2026-07-17 SWA2222 - Jul 17, 13:15 UTCJul 17, 14:15 UTC1h 0m
2026-07-17 SWA2893 MDW → SFO Jul 17, 04:39 UTCJul 17, 08:25 UTC3h 45m
2026-07-17 SWA3441 - Jul 17, 01:29 UTCJul 17, 03:05 UTC1h 35m
2026-07-16 SWA1693 ABQ → HOU Jul 16, 21:25 UTCJul 17, 00:20 UTC2h 55m
2026-07-16 SWA3399 AUS → DEN Jul 16, 17:40 UTCJul 16, 19:25 UTC1h 45m
2026-07-16 SWA2363 SJC → AUS Jul 16, 13:25 UTCJul 16, 16:35 UTC3h 10m
2026-07-16 SWA660 LAS → SJC Jul 16, 04:55 UTCJul 16, 05:50 UTC55m
2026-07-16 SWA3935 STL → LAS Jul 16, 00:50 UTCJul 16, 03:35 UTC2h 45m
2026-07-16 SWA3935 STL → LAS Jul 16, 00:46 UTCJul 16, 03:29 UTC2h 44m
2026-07-15 SWA2305 - Jul 15, 20:15 UTCJul 15, 23:45 UTC3h 30m
2026-07-15 SWA2305 SFO → STL Jul 15, 20:13 UTCJul 15, 23:42 UTC3h 30m
2026-07-15 SWA2427 LAX → SFO Jul 15, 17:55 UTCJul 15, 18:55 UTC1h 0m
2026-07-15 SWA2427 LAX → SFO Jul 15, 17:54 UTCJul 15, 18:54 UTC1h 0m
2026-07-15 SWA2007 - Jul 15, 13:35 UTCJul 15, 16:30 UTC2h 55m
2026-07-15 SWA2007 - Jul 15, 10:35 UTCJul 15, 12:15 UTC1h 40m
2026-07-14 SWA8800 DAL → ATL Jul 14, 20:10 UTCJul 14, 21:45 UTC1h 35m
2026-07-14 SWA8800 DAL → ATL Jul 14, 20:06 UTCJul 14, 21:44 UTC1h 38m
2026-07-14 SWA26 - Jul 14, 18:30 UTCJul 14, 19:15 UTC45m
2026-07-14 SWA2287 - Jul 14, 14:15 UTCJul 14, 17:05 UTC2h 50m
2026-07-14 SWA2580 - Jul 14, 06:30 UTCJul 14, 07:15 UTC45m
2026-07-14 SWA2580 ABQ → PHX Jul 14, 04:05 UTCJul 14, 05:00 UTC55m
2026-07-14 SWA2580 - Jul 14, 00:05 UTCJul 14, 02:55 UTC2h 50m
2026-07-13 SWA1587 - Jul 13, 21:40 UTCJul 13, 22:50 UTC1h 10m
2026-07-13 SWA753 - Jul 13, 18:45 UTCJul 13, 20:25 UTC1h 40m
2026-07-13 SWA3475 SAN → AUS Jul 13, 15:10 UTCJul 13, 17:40 UTC2h 30m
2026-07-13 SWA1393 DAL → SAN Jul 13, 11:35 UTCJul 13, 14:05 UTC2h 30m
2026-07-13 SWA1927 - Jul 13, 00:55 UTCJul 13, 01:55 UTC1h 0m
2026-07-13 SWA1927 MAF → DAL Jul 13, 00:53 UTCJul 13, 01:54 UTC1h 1m
2026-07-12 SWA4995 HOU → MAF Jul 12, 22:26 UTCJul 12, 23:27 UTC1h 1m
2026-07-12 SWA1013 BZE → HOU Jul 12, 18:06 UTCJul 12, 20:25 UTC2h 19m
2026-07-12 SWA1013 - Jul 12, 15:01 UTCJul 12, 20:25 UTC5h 25m
2026-07-12 SWA4474 - Jul 12, 04:05 UTCJul 12, 05:35 UTC1h 30m
2026-07-12 SWA4141 - Jul 12, 00:50 UTCJul 12, 02:15 UTC1h 25m
2026-07-12 SWA4141 RDU → BNA Jul 12, 00:50 UTCJul 12, 02:18 UTC1h 28m
2026-07-11 SWA4183 - Jul 11, 22:30 UTCJul 12, 00:05 UTC1h 35m
2026-07-11 SWA4183 HOU → MCO Jul 11, 22:25 UTCJul 12, 00:01 UTC1h 36m
2026-07-11 SWA4222 DEN → FLL Jul 11, 17:49 UTCJul 11, 21:19 UTC3h 30m
2026-07-11 SWA4222 DEN → FLL Jul 11, 17:50 UTCJul 11, 21:20 UTC3h 30m
2026-07-11 SWA854 DAL → DEN Jul 11, 14:35 UTCJul 11, 16:20 UTC1h 45m
2026-07-11 SWA3965 MSY → DAL Jul 11, 12:15 UTCJul 11, 13:20 UTC1h 5m
2026-07-11 SWA2836 - Jul 11, 03:20 UTCJul 11, 05:10 UTC1h 50m
2026-07-11 SWA2836 MDW → MSY Jul 11, 03:18 UTCJul 11, 05:10 UTC1h 52m
2026-07-11 SWA1782 - Jul 11, 01:20 UTCJul 11, 02:05 UTC45m
2026-07-10 SWA1782 LAS → DTW Jul 10, 20:50 UTCJul 11, 00:10 UTC3h 20m
2026-07-10 SWA1782 - Jul 10, 17:10 UTCJul 10, 19:05 UTC1h 55m
2026-07-10 SWA3433 DEN → GEG Jul 10, 14:20 UTCJul 10, 16:05 UTC1h 45m

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 N1811U page for operator, model, and routing details .

Mode-S A146F1 frequently asked

What is Mode-S code A146F1?
A146F1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1811U.
Where is Mode-S A146F1 registered?
Mode-S code A146F1 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 A146F1 broadcasting right now?
No active broadcast right now. Last signal was 38m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A146F1, octal 50243361, decimal 10,569,457.
What flights does A146F1 operate?
Mode-S A146F1 has broadcast 20 distinct callsigns, including SWA2122, SWA2328, SWA4994, SWA1865, SWA1642.