Apparatus

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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 Jul 26, 20:05 UTC
Flights observed
632
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

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
SWA2240 Southwest Airlines 6 2026-07-25
SWA4994 Southwest Airlines 4 2026-06-29
SWA1927 Southwest Airlines 4 2026-07-22
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
SWA495 Southwest Airlines 3 2026-07-26
SWA4348 Southwest Airlines 3 2026-07-25
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1921 SAN → LAS Jul 26, 19:55 UTCJul 26, 20:05 UTC10m
2026-07-26 SWA2167 MDW → PHL Jul 26, 18:10 UTCJul 26, 18:40 UTC30m
2026-07-26 SWA495 HOU → MAF Jul 26, 07:05 UTCJul 26, 07:30 UTC25m
2026-07-26 SWA495 HOU → MAF Jul 26, 07:01 UTCJul 26, 07:30 UTC29m
2026-07-25 SWA2240 LAX → MDW Jul 25, 17:35 UTCJul 25, 23:35 UTC6h 0m
2026-07-25 SWA4348 SRQ → ATL Jul 25, 14:50 UTCJul 25, 16:00 UTC1h 10m
2026-07-25 SWA2523 SJC → SNA Jul 25, 07:30 UTCJul 25, 12:00 UTC4h 30m
2026-07-24 SWA3058 BNA → DAL Jul 24, 20:59 UTCJul 25, 02:18 UTC5h 19m
2026-07-24 SWA3058 BNA → DAL Jul 24, 21:00 UTCJul 25, 02:05 UTC5h 5m
2026-07-24 SWA2336 DEN → SFO Jul 24, 18:35 UTCJul 24, 19:20 UTC45m
2026-07-24 SWA2336 DEN → SFO Jul 24, 16:50 UTCJul 24, 17:40 UTC50m
2026-07-24 SWA2336 DEN → SFO Jul 24, 14:40 UTCJul 24, 15:20 UTC40m
2026-07-24 SWA864 BWI → MHT Jul 24, 12:30 UTCJul 24, 13:25 UTC55m
2026-07-24 SWA1663 MDW → DEN Jul 24, 04:40 UTCJul 24, 06:25 UTC1h 45m
2026-07-24 SWA4246 LAS → OAK Jul 24, 00:55 UTCJul 24, 03:15 UTC2h 20m
2026-07-23 SWA1940 SJC → DEN Jul 23, 22:10 UTCJul 23, 23:00 UTC50m
2026-07-23 SWA1940 SJC → DEN Jul 23, 18:30 UTCJul 23, 18:45 UTC15m
2026-07-23 SWA2148 FLL → STL Jul 23, 16:20 UTCJul 23, 16:50 UTC30m
2026-07-23 SWA1907 HOU → LGA Jul 23, 07:05 UTCJul 23, 07:25 UTC20m
2026-07-23 SWA2170 BUR → LAS Jul 23, 05:10 UTCJul 23, 05:45 UTC35m
2026-07-23 SWA2170 BUR → LAS Jul 23, 05:06 UTCJul 23, 05:40 UTC34m
2026-07-23 SWA1911 PHX → OAK Jul 23, 03:35 UTCJul 23, 04:05 UTC30m
2026-07-23 SWA2151 PHX → SJC Jul 23, 02:00 UTCJul 23, 02:30 UTC30m
2026-07-22 SWA648 LAX → OAK Jul 22, 23:55 UTCJul 23, 00:20 UTC25m
2026-07-22 SWA2150 AUS → SMF Jul 22, 22:05 UTCJul 22, 22:45 UTC40m
2026-07-22 SWA1903 BUR → SJC Jul 22, 19:15 UTCJul 22, 19:35 UTC20m
2026-07-22 SWA1903 BUR → SJC Jul 22, 19:09 UTCJul 22, 19:46 UTC37m
2026-07-22 SWA3092 BWI → MHT Jul 22, 17:35 UTCJul 22, 17:55 UTC20m
2026-07-22 SWA3092 BWI → MHT Jul 22, 17:30 UTCJul 22, 17:54 UTC24m
2026-07-22 SWA1927 DCA → MSY Jul 22, 16:05 UTCJul 22, 16:25 UTC20m
2026-07-22 SWA1927 DCA → MSY Jul 22, 16:01 UTCJul 22, 16:23 UTC22m
2026-07-22 SWA2329 PVD → BWI Jul 22, 01:40 UTCJul 22, 02:15 UTC35m
2026-07-21 SWA4457 BUR → PHX Jul 21, 21:25 UTCJul 22, 00:15 UTC2h 50m
2026-07-21 SWA762 SAN → LAS Jul 21, 19:25 UTCJul 21, 20:10 UTC45m
2026-07-21 SWA1753 DEN → STL Jul 21, 16:55 UTCJul 21, 18:30 UTC1h 35m
2026-07-21 SWA3041 BNA → SRQ Jul 21, 13:17 UTCJul 21, 15:25 UTC2h 8m
2026-07-21 SWA3041 BNA → SRQ Jul 21, 13:20 UTCJul 21, 15:30 UTC2h 10m
2026-07-21 SWA4042 OMA → PHX Jul 21, 03:15 UTCJul 21, 07:20 UTC4h 5m
2026-07-20 SWA3911 BNA → BDL Jul 20, 23:40 UTCJul 21, 01:50 UTC2h 10m
2026-07-20 SWA3892 SAN → SJC Jul 20, 20:05 UTCJul 20, 22:15 UTC2h 10m
2026-07-20 SWA240 DEN → TUL Jul 20, 17:30 UTCJul 20, 18:45 UTC1h 15m
2026-07-20 SWA1947 MCO → SAT Jul 20, 14:45 UTCJul 20, 16:15 UTC1h 30m
2026-07-20 SWA2995 LAS → MCI Jul 20, 12:30 UTCJul 20, 13:20 UTC50m
2026-07-20 SWA4864 LAS → SAT Jul 20, 03:05 UTCJul 20, 06:30 UTC3h 25m
2026-07-20 SWA900 BWI → MHT Jul 20, 01:10 UTCJul 20, 01:50 UTC40m
2026-07-19 SWA900 BWI → MHT Jul 19, 20:55 UTCJul 19, 21:05 UTC10m
2026-07-19 SWA2637 - Jul 19, 19:20 UTCJul 19, 19:25 UTC5m
2026-07-19 SWA2637 - Jul 19, 14:15 UTCJul 19, 14:45 UTC30m
2026-07-19 SWA4082 - Jul 19, 11:15 UTCJul 19, 11:45 UTC30m
2026-07-19 SWA4082 - Jul 19, 07:05 UTCJul 19, 07:20 UTC15m

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 Jul 26, 20:05 UTC.
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, SWA2240, SWA4994, SWA1927.