Apparatus

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sensors Mode-S transponder

A19F29

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N203WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A19F29
Octal
50317451
Decimal
10,592,041
Country
US
Tail
N203WN
Type
B737
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
748
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A19F29.

Country allocation

The ICAO 24-bit address A19F29 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
SWA3199 Southwest Airlines 6 2026-05-17
SWA375 Southwest Airlines 5 2026-07-24
SWA3354 Southwest Airlines 5 2026-04-18
SWA2384 Southwest Airlines 5 2026-07-23
SWA2310 - 5 2026-06-15
SWA1654 - 5 2026-04-16
SWA1472 Southwest Airlines 5 2026-05-22
SWA1129 Southwest Airlines 5 2026-05-13
SWA826 Southwest Airlines 4 2026-05-21
SWA686 - 4 2026-07-18
SWA579 - 4 2026-07-09
SWA41 - 4 2026-06-28
SWA3664 - 4 2026-07-06
SWA351 - 4 2026-06-22
SWA2529 Southwest Airlines 4 2026-06-13
SWA188 Southwest Airlines 4 2026-05-15
SWA1432 - 4 2026-07-02
SWA1230 - 4 2026-07-15
SWA1160 Southwest Airlines 4 2026-05-31
SWA977 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2658 DTW → MDW Jul 26, 20:15 UTCJul 26, 21:35 UTC1h 20m
2026-07-26 SWA4635 MDW → ALB Jul 26, 17:05 UTCJul 26, 18:15 UTC1h 10m
2026-07-26 SWA3261 DAL → ORD Jul 26, 14:35 UTCJul 26, 15:55 UTC1h 20m
2026-07-26 BOE1234 PHX → PHX Jul 26, 07:55 UTCJul 26, 08:15 UTC20m
2026-07-26 SWA158 AUS → SNA Jul 26, 00:15 UTCJul 26, 03:05 UTC2h 50m
2026-07-25 SWA194 DEN → SFO Jul 25, 20:50 UTCJul 25, 23:10 UTC2h 20m
2026-07-25 SWA3034 MCO → MSY Jul 25, 16:35 UTCJul 25, 19:40 UTC3h 5m
2026-07-25 SWA3034 MCO → MSY Jul 25, 14:35 UTCJul 25, 15:25 UTC50m
2026-07-25 SWA3248 STL → BOS Jul 25, 03:40 UTCJul 25, 04:40 UTC1h 0m
2026-07-25 SWA3248 STL → BOS Jul 25, 03:37 UTCJul 25, 04:32 UTC55m
2026-07-25 SWA3088 DCA → DAL Jul 25, 01:35 UTCJul 25, 02:30 UTC55m
2026-07-25 SWA3088 DCA → DAL Jul 25, 01:33 UTCJul 25, 02:28 UTC55m
2026-07-24 SWA3088 DCA → DAL Jul 24, 23:35 UTCJul 25, 00:40 UTC1h 5m
2026-07-24 SWA375 DEN → OAK Jul 24, 21:45 UTCJul 24, 22:45 UTC1h 0m
2026-07-24 SWA375 DEN → OAK Jul 24, 21:44 UTCJul 24, 22:39 UTC55m
2026-07-24 SWA375 DEN → OAK Jul 24, 19:55 UTCJul 24, 20:50 UTC55m
2026-07-24 SWA375 DEN → OAK Jul 24, 17:00 UTCJul 24, 18:50 UTC1h 50m
2026-07-24 SWA375 DEN → OAK Jul 24, 12:05 UTCJul 24, 15:45 UTC3h 40m
2026-07-24 SWA892 MDW → MCI Jul 24, 03:30 UTCJul 24, 04:30 UTC1h 0m
2026-07-24 SWA892 MDW → MCI Jul 24, 03:28 UTCJul 24, 04:20 UTC52m
2026-07-23 SWA2384 SAN → SJC Jul 23, 21:40 UTCJul 24, 02:20 UTC4h 40m
2026-07-23 SWA2384 SAN → SJC Jul 23, 19:20 UTCJul 23, 20:15 UTC55m
2026-07-23 SWA2384 SAN → SJC Jul 23, 16:25 UTCJul 23, 18:30 UTC2h 5m
2026-07-23 SWA2384 SAN → SJC Jul 23, 13:45 UTCJul 23, 14:45 UTC1h 0m
2026-07-23 SWA2384 SAN → SJC Jul 23, 11:15 UTCJul 23, 12:40 UTC1h 25m
2026-07-23 SWA690 LAS → HOU Jul 23, 00:45 UTCJul 23, 03:20 UTC2h 35m
2026-07-23 SWA690 LAS → HOU Jul 23, 00:40 UTCJul 23, 03:13 UTC2h 33m
2026-07-22 SWA690 LAS → HOU Jul 22, 21:30 UTCJul 22, 23:25 UTC1h 55m
2026-07-22 SWA803 OGG → OAK Jul 22, 19:25 UTCJul 22, 20:35 UTC1h 10m
2026-07-22 SWA803 OGG → OAK Jul 22, 17:30 UTCJul 22, 18:25 UTC55m
2026-07-22 SWA803 OGG → OAK Jul 22, 13:45 UTCJul 22, 16:35 UTC2h 50m
2026-07-22 SWA4392 SJC → PHX Jul 22, 11:20 UTCJul 22, 11:55 UTC35m
2026-07-22 SWA2073 DAL → LGA Jul 22, 02:35 UTCJul 22, 04:20 UTC1h 45m
2026-07-22 SWA2073 DAL → LGA Jul 22, 02:30 UTCJul 22, 04:12 UTC1h 42m
2026-07-21 SWA2073 DAL → LGA Jul 21, 23:40 UTCJul 22, 01:15 UTC1h 35m
2026-07-21 SWA198 BWI → TPA Jul 21, 21:45 UTCJul 21, 22:55 UTC1h 10m
2026-07-21 SWA198 BWI → TPA Jul 21, 21:44 UTCJul 21, 22:49 UTC1h 5m
2026-07-21 SWA198 BWI → TPA Jul 21, 19:40 UTCJul 21, 20:35 UTC55m
2026-07-21 SWA222 ATL → STL Jul 21, 17:10 UTCJul 21, 18:45 UTC1h 35m
2026-07-21 SWA4137 BWI → CLE Jul 21, 12:15 UTCJul 21, 15:25 UTC3h 10m
2026-07-21 SWA3023 - Jul 21, 02:45 UTCJul 21, 04:40 UTC1h 55m
2026-07-21 SWA3023 MSY → TPA Jul 21, 00:25 UTCJul 21, 01:35 UTC1h 10m
2026-07-20 SWA2670 OAK → MDW Jul 20, 21:50 UTCJul 20, 23:12 UTC1h 22m
2026-07-20 SWA2670 OAK → MDW Jul 20, 21:55 UTCJul 20, 23:10 UTC1h 15m
2026-07-20 SWA1031 DEN → OAK Jul 20, 17:20 UTCJul 20, 20:20 UTC3h 0m
2026-07-20 SWA1031 DEN → OAK Jul 20, 17:19 UTCJul 20, 20:14 UTC2h 56m
2026-07-20 SWA1031 DEN → OAK Jul 20, 15:35 UTCJul 20, 16:25 UTC50m
2026-07-20 SWA732 BOS → BWI Jul 20, 13:20 UTCJul 20, 14:20 UTC1h 0m
2026-07-20 SWA883 - Jul 20, 11:00 UTCJul 20, 12:00 UTC1h 0m
2026-07-20 SWA883 BWI → BOS Jul 20, 10:57 UTCJul 20, 11:58 UTC1h 1m

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 N203WN page for operator, model, and routing details .

Mode-S A19F29 frequently asked

What is Mode-S code A19F29?
A19F29 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N203WN.
Where is Mode-S A19F29 registered?
Mode-S code A19F29 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 A19F29 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A19F29, octal 50317451, decimal 10,592,041.
What flights does A19F29 operate?
Mode-S A19F29 has broadcast 20 distinct callsigns, including SWA3199, SWA375, SWA3354, SWA2384, SWA2310.