Apparatus

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sensors Mode-S transponder

AC429B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8897K · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC429B
Octal
53041233
Decimal
11,289,243
Country
US
Tail
N8897K
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
647
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AC429B.

Country allocation

The ICAO 24-bit address AC429B 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
SWA693 - 4 2026-07-13
SWA4726 Southwest Airlines 4 2026-05-26
SWA3952 Southwest Airlines 4 2026-05-03
SWA3393 Southwest Airlines 4 2026-06-11
SWA1260 - 4 2026-06-29
SWA898 Southwest Airlines 3 2026-05-12
SWA717 - 3 2026-06-18
SWA551 Southwest Airlines 3 2026-05-16
SWA4662 - 3 2026-07-11
SWA4650 Southwest Airlines 3 2026-05-16
SWA4384 Southwest Airlines 3 2026-04-17
SWA419 Southwest Airlines 3 2026-06-30
SWA406 Southwest Airlines 3 2026-05-10
SWA366 Southwest Airlines 3 2026-05-08
SWA358 Southwest Airlines 3 2026-04-16
SWA3295 - 3 2026-07-10
SWA3290 - 3 2026-07-08
SWA3200 Southwest Airlines 3 2026-05-31
SWA3193 Southwest Airlines 3 2026-05-09
SWA3123 - 3 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA1264 DAL → ATL Jul 14, 00:55 UTCJul 14, 02:35 UTC1h 40m
2026-07-13 SWA2758 - Jul 13, 21:55 UTCJul 13, 23:45 UTC1h 50m
2026-07-13 SWA2572 - Jul 13, 19:35 UTCJul 13, 20:35 UTC1h 0m
2026-07-13 SWA2810 - Jul 13, 17:25 UTCJul 13, 18:25 UTC1h 0m
2026-07-13 SWA2810 SEA → MDW Jul 13, 12:45 UTCJul 13, 16:20 UTC3h 35m
2026-07-13 SWA693 SMF → SEA Jul 13, 05:35 UTCJul 13, 06:50 UTC1h 15m
2026-07-13 SWA693 SMF → SEA Jul 13, 05:33 UTCJul 13, 06:46 UTC1h 13m
2026-07-13 SWA4464 SAN → SMF Jul 13, 02:52 UTCJul 13, 03:58 UTC1h 6m
2026-07-13 SWA4464 - Jul 13, 02:55 UTCJul 13, 04:00 UTC1h 5m
2026-07-12 SWA391 AUS → SAN Jul 12, 23:06 UTCJul 13, 01:27 UTC2h 21m
2026-07-12 SWA391 AUS → SAN Jul 12, 23:05 UTCJul 13, 01:35 UTC2h 30m
2026-07-12 SWA4860 - Jul 12, 19:40 UTCJul 12, 21:55 UTC2h 15m
2026-07-12 SWA4860 JAX → AUS Jul 12, 19:39 UTCJul 12, 21:51 UTC2h 12m
2026-07-12 SWA4499 - Jul 12, 16:40 UTCJul 12, 18:30 UTC1h 50m
2026-07-12 SWA3749 - Jul 12, 13:01 UTCJul 12, 15:35 UTC2h 35m
2026-07-12 SWA1378 - Jul 12, 03:30 UTCJul 12, 04:45 UTC1h 15m
2026-07-12 SWA1378 PDX → OAK Jul 12, 01:05 UTCJul 12, 02:35 UTC1h 30m
2026-07-11 SWA1378 - Jul 11, 21:00 UTCJul 12, 00:01 UTC3h 0m
2026-07-11 SWA1193 - Jul 11, 17:40 UTCJul 11, 18:45 UTC1h 5m
2026-07-11 SWA1193 MYR → MCI Jul 11, 17:27 UTCJul 11, 19:46 UTC2h 19m
2026-07-11 SWA3916 - Jul 11, 15:15 UTCJul 11, 16:20 UTC1h 5m
2026-07-11 SWA1954 - Jul 11, 12:30 UTCJul 11, 13:50 UTC1h 20m
2026-07-11 SWA1954 HOU → BNA Jul 11, 12:21 UTCJul 11, 13:49 UTC1h 28m
2026-07-11 SWA4662 - Jul 11, 01:55 UTCJul 11, 02:40 UTC45m
2026-07-11 SWA4662 MSY → HOU Jul 11, 01:51 UTCJul 11, 02:42 UTC51m
2026-07-10 SWA2470 LGA → MSY Jul 10, 22:15 UTCJul 11, 00:50 UTC2h 35m
2026-07-10 SWA2803 - Jul 10, 18:20 UTCJul 10, 20:00 UTC1h 40m
2026-07-10 SWA3295 - Jul 10, 13:40 UTCJul 10, 16:25 UTC2h 45m
2026-07-10 SWA3295 PHX → MDW Jul 10, 13:36 UTCJul 10, 16:24 UTC2h 48m
2026-07-10 SWA3697 SJC → PHX Jul 10, 05:50 UTCJul 10, 07:20 UTC1h 30m
2026-07-10 SWA3697 SJC → PHX Jul 10, 05:50 UTCJul 10, 07:17 UTC1h 27m
2026-07-10 SWA3865 LAS → SJC Jul 10, 03:15 UTCJul 10, 04:15 UTC1h 0m
2026-07-10 SWA3865 LAS → SJC Jul 10, 03:14 UTCJul 10, 04:15 UTC1h 1m
2026-07-09 SWA547 BNA → LAS Jul 9, 23:05 UTCJul 10, 02:25 UTC3h 20m
2026-07-09 SWA547 BNA → LAS Jul 9, 23:04 UTCJul 10, 02:20 UTC3h 16m
2026-07-09 SWA1715 BOS → DEN Jul 9, 20:05 UTCJul 9, 22:00 UTC1h 55m
2026-07-09 SWA1715 BOS → DEN Jul 9, 20:05 UTCJul 9, 21:50 UTC1h 45m
2026-07-09 SWA4847 - Jul 9, 17:05 UTCJul 9, 18:55 UTC1h 50m
2026-07-09 SWA4847 BNA → FLL Jul 9, 17:04 UTCJul 9, 18:51 UTC1h 48m
2026-07-09 SWA3235 - Jul 9, 12:40 UTCJul 9, 15:40 UTC3h 0m
2026-07-09 SWA4285 SMF → PHX Jul 9, 02:19 UTCJul 9, 03:44 UTC1h 25m
2026-07-09 SWA4285 SMF → PHX Jul 9, 02:20 UTCJul 9, 03:45 UTC1h 25m
2026-07-08 SWA1166 DAL → PHX Jul 8, 23:50 UTCJul 9, 01:21 UTC1h 31m
2026-07-08 SWA1166 PHX → SMF Jul 8, 23:50 UTCJul 9, 01:25 UTC1h 35m
2026-07-08 SWA1166 DEN → PHX Jul 8, 21:10 UTCJul 8, 22:40 UTC1h 30m
2026-07-08 SWA2548 - Jul 8, 18:35 UTCJul 8, 19:55 UTC1h 20m
2026-07-08 SWA2548 MCI → DEN Jul 8, 18:31 UTCJul 8, 19:50 UTC1h 20m
2026-07-08 SWA3290 - Jul 8, 15:15 UTCJul 8, 17:25 UTC2h 10m
2026-07-08 SWA1048 PDX → PHX Jul 8, 06:00 UTCJul 8, 08:10 UTC2h 10m
2026-07-07 SWA4765 - Jul 7, 22:55 UTCJul 8, 02:40 UTC3h 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 N8897K page for operator, model, and routing details .

Mode-S AC429B frequently asked

What is Mode-S code AC429B?
AC429B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8897K.
Where is Mode-S AC429B registered?
Mode-S code AC429B 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 AC429B broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC429B, octal 53041233, decimal 11,289,243.
What flights does AC429B operate?
Mode-S AC429B has broadcast 20 distinct callsigns, including SWA693, SWA4726, SWA3952, SWA3393, SWA1260.