Apparatus

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sensors Mode-S transponder

A1BF3A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N211WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A1BF3A
Octal
50337472
Decimal
10,600,250
Country
US
Tail
N211WN
Type
B737
No current signal · last broadcast 55m ago
Flights observed
668
Distinct callsigns
20
Country
US
Last broadcast
55m ago

Last known position

Most recent position reported by Mode-S A1BF3A.

Country allocation

The ICAO 24-bit address A1BF3A 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
SWA1433 Southwest Airlines 8 2026-06-29
SWA411 - 6 2026-07-13
SWA2448 Southwest Airlines 6 2026-05-18
SWA686 - 5 2026-06-27
SWA2310 Southwest Airlines 5 2026-06-05
SWA2286 - 5 2026-06-24
SWA2087 Southwest Airlines 5 2026-05-13
SWA1095 Southwest Airlines 5 2026-04-20
SWA853 - 4 2026-07-10
SWA4724 Southwest Airlines 4 2026-06-09
SWA3858 - 4 2026-07-10
SWA3528 Southwest Airlines 4 2026-04-28
SWA3414 Southwest Airlines 4 2026-05-23
SWA339 - 4 2026-06-28
SWA2718 Southwest Airlines 4 2026-04-17
SWA2705 Southwest Airlines 4 2026-06-01
SWA2570 - 4 2026-06-18
SWA2433 - 4 2026-07-02
SWA2072 Southwest Airlines 4 2026-05-17
SWA1920 - 4 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA329 - Jul 14, 00:25 UTCJul 14, 02:30 UTC2h 5m
2026-07-13 SWA329 STL → AUS Jul 13, 21:15 UTCJul 13, 23:00 UTC1h 45m
2026-07-13 SWA1412 - Jul 13, 18:50 UTCJul 13, 20:20 UTC1h 30m
2026-07-13 SWA1487 - Jul 13, 15:50 UTCJul 13, 16:30 UTC40m
2026-07-13 SWA1487 MDW → DAL Jul 13, 15:46 UTCJul 13, 17:26 UTC1h 40m
2026-07-13 SWA1894 - Jul 13, 10:45 UTCJul 13, 11:20 UTC35m
2026-07-13 SWA4113 - Jul 13, 02:35 UTCJul 13, 03:05 UTC30m
2026-07-13 SWA4113 MDW → GRR Jul 13, 02:33 UTCJul 13, 03:01 UTC28m
2026-07-13 SWA411 - Jul 13, 00:05 UTCJul 13, 00:55 UTC50m
2026-07-13 SWA411 DEN → AUS Jul 13, 00:02 UTCJul 13, 00:51 UTC49m
2026-07-12 SWA411 - Jul 12, 21:45 UTCJul 12, 23:00 UTC1h 15m
2026-07-12 SWA411 - Jul 12, 18:35 UTCJul 12, 20:50 UTC2h 15m
2026-07-12 SWA411 - Jul 12, 16:55 UTCJul 12, 17:25 UTC30m
2026-07-12 SWA411 AUS → TPA Jul 12, 13:50 UTCJul 12, 15:55 UTC2h 5m
2026-07-12 SWA3998 TPA → AUS Jul 12, 10:55 UTCJul 12, 12:55 UTC2h 0m
2026-07-12 SWA3998 TPA → AUS Jul 12, 10:52 UTCJul 12, 12:57 UTC2h 5m
2026-07-11 SWA4618 - Jul 11, 23:25 UTCJul 12, 01:25 UTC2h 0m
2026-07-11 SWA628 - Jul 11, 20:05 UTCJul 11, 21:10 UTC1h 5m
2026-07-11 SWA1920 - Jul 11, 15:55 UTCJul 11, 16:50 UTC55m
2026-07-11 SWA1920 PHX → SJD Jul 11, 15:54 UTCJul 11, 17:31 UTC1h 37m
2026-07-11 SWA4224 - Jul 11, 13:10 UTCJul 11, 13:45 UTC35m
2026-07-11 SWA4224 ELP → PHX Jul 11, 12:52 UTCJul 11, 13:46 UTC55m
2026-07-11 SWA3498 - Jul 11, 04:45 UTCJul 11, 05:55 UTC1h 10m
2026-07-11 SWA3498 SAN → ELP Jul 11, 04:42 UTCJul 11, 06:06 UTC1h 24m
2026-07-11 SWA1288 - Jul 11, 03:01 UTCJul 11, 03:50 UTC50m
2026-07-11 SWA1288 SFO → LAS Jul 11, 00:10 UTCJul 11, 01:15 UTC1h 5m
2026-07-10 SWA3168 - Jul 10, 21:35 UTCJul 10, 22:35 UTC1h 0m
2026-07-10 SWA3168 - Jul 10, 19:35 UTCJul 10, 20:20 UTC45m
2026-07-10 SWA3708 - Jul 10, 17:35 UTCJul 10, 18:20 UTC45m
2026-07-10 SWA3708 SNA → LAS Jul 10, 17:34 UTCJul 10, 18:24 UTC50m
2026-07-10 SWA3708 - Jul 10, 15:35 UTCJul 10, 16:35 UTC1h 0m
2026-07-10 SWA3858 - Jul 10, 14:05 UTCJul 10, 14:55 UTC50m
2026-07-10 SWA3858 SNA → SJC Jul 10, 14:00 UTCJul 10, 14:54 UTC54m
2026-07-10 SWA3837 - Jul 10, 03:50 UTCJul 10, 04:55 UTC1h 5m
2026-07-10 SWA853 - Jul 10, 02:00 UTCJul 10, 03:00 UTC1h 0m
2026-07-10 SWA853 BUR → SMF Jul 10, 01:59 UTCJul 10, 02:55 UTC56m
2026-07-10 SWA3663 SJC → BUR Jul 10, 00:25 UTCJul 10, 01:10 UTC45m
2026-07-09 SWA4883 - Jul 9, 22:20 UTCJul 9, 23:15 UTC55m
2026-07-09 SWA4883 BUR → SJC Jul 9, 22:19 UTCJul 9, 23:08 UTC49m
2026-07-09 SWA2203 LAS → BUR Jul 9, 20:40 UTCJul 9, 21:25 UTC45m
2026-07-09 SWA3090 - Jul 9, 18:20 UTCJul 9, 19:00 UTC40m
2026-07-09 SWA3036 OAK → BUR Jul 9, 16:25 UTCJul 9, 17:20 UTC55m
2026-07-09 SWA4947 LGB → OAK Jul 9, 14:10 UTCJul 9, 15:05 UTC55m
2026-07-09 SWA4947 LGB → OAK Jul 9, 14:09 UTCJul 9, 14:58 UTC49m
2026-07-08 SWA992 - Jul 8, 23:20 UTCJul 8, 23:40 UTC20m
2026-07-08 SWA1577 - Jul 8, 20:10 UTCJul 8, 21:00 UTC50m
2026-07-08 SWA1577 DEN → OAK Jul 8, 17:05 UTCJul 8, 19:20 UTC2h 15m
2026-07-08 SWA1577 - Jul 8, 14:45 UTCJul 8, 16:05 UTC1h 20m
2026-07-08 SWA1577 - Jul 8, 11:00 UTCJul 8, 13:05 UTC2h 5m
2026-07-08 SWA1295 - Jul 8, 01:35 UTCJul 8, 04:00 UTC2h 25m

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 N211WN page for operator, model, and routing details .

Mode-S A1BF3A frequently asked

What is Mode-S code A1BF3A?
A1BF3A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N211WN.
Where is Mode-S A1BF3A registered?
Mode-S code A1BF3A 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 A1BF3A broadcasting right now?
No active broadcast right now. Last signal was 55m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1BF3A, octal 50337472, decimal 10,600,250.
What flights does A1BF3A operate?
Mode-S A1BF3A has broadcast 20 distinct callsigns, including SWA1433, SWA411, SWA2448, SWA686, SWA2310.