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 Jul 26, 21:35 UTC
Flights observed
739
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

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
SWA419 Southwest Airlines 4 2026-07-26
SWA3952 Southwest Airlines 4 2026-05-03
SWA3393 Southwest Airlines 4 2026-06-11
SWA1355 Southwest Airlines 4 2026-07-23
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
SWA444 - 3 2026-07-16
SWA4384 Southwest Airlines 3 2026-04-17
SWA4324 - 3 2026-07-21
SWA406 Southwest Airlines 3 2026-05-10
SWA3719 - 3 2026-07-20
SWA366 Southwest Airlines 3 2026-05-08
SWA358 Southwest Airlines 3 2026-04-16
SWA3295 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA419 BUR → OAK Jul 26, 19:30 UTCJul 26, 21:35 UTC2h 5m
2026-07-26 SWA1294 PWM → BWI Jul 26, 17:00 UTCJul 26, 18:20 UTC1h 20m
2026-07-26 SWA1294 PWM → BWI Jul 26, 16:56 UTCJul 26, 18:16 UTC1h 20m
2026-07-26 SWA1294 PWM → BWI Jul 26, 12:50 UTCJul 26, 15:50 UTC3h 0m
2026-07-26 SWA3070 BWI → ATL Jul 26, 03:05 UTCJul 26, 04:40 UTC1h 35m
2026-07-26 SWA3017 ORD → DAL Jul 26, 00:50 UTCJul 26, 01:50 UTC1h 0m
2026-07-26 SWA3017 ORD → DAL Jul 26, 00:49 UTCJul 26, 01:50 UTC1h 1m
2026-07-25 SWA3017 ORD → DAL Jul 25, 20:15 UTCJul 25, 23:40 UTC3h 25m
2026-07-25 SWA3895 BHM → DEN Jul 25, 18:05 UTCJul 25, 18:50 UTC45m
2026-07-25 SWA3760 ALB → MCO Jul 25, 13:55 UTCJul 25, 17:05 UTC3h 10m
2026-07-25 SWA2884 PHX → ABQ Jul 25, 03:40 UTCJul 25, 07:10 UTC3h 30m
2026-07-25 SWA3441 MCO → MHT Jul 25, 00:30 UTCJul 25, 02:05 UTC1h 35m
2026-07-25 SWA3441 MCO → MHT Jul 25, 00:29 UTCJul 25, 02:05 UTC1h 36m
2026-07-24 SWA1693 ABQ → HOU Jul 24, 20:50 UTCJul 24, 23:35 UTC2h 45m
2026-07-24 SWA1693 ABQ → HOU Jul 24, 20:45 UTCJul 24, 23:30 UTC2h 45m
2026-07-24 SWA9001 SAN → LAS Jul 24, 17:20 UTCJul 24, 19:15 UTC1h 55m
2026-07-24 SWA9001 SAN → LAS Jul 24, 17:17 UTCJul 24, 19:11 UTC1h 54m
2026-07-24 SWA3824 BNA → DCA Jul 24, 13:25 UTCJul 24, 16:05 UTC2h 40m
2026-07-24 SWA4430 OAK → SNA Jul 24, 10:15 UTCJul 24, 11:40 UTC1h 25m
2026-07-24 SWA4430 OAK → SNA Jul 24, 10:10 UTCJul 24, 11:45 UTC1h 35m
2026-07-24 SWA1852 PHX → SFO Jul 24, 00:45 UTCJul 24, 02:35 UTC1h 50m
2026-07-23 SWA947 CVG → MDW Jul 23, 21:40 UTCJul 23, 23:50 UTC2h 10m
2026-07-23 SWA1892 AUS → MSY Jul 23, 19:10 UTCJul 23, 20:25 UTC1h 15m
2026-07-23 SWA1892 AUS → MSY Jul 23, 19:09 UTCJul 23, 20:26 UTC1h 17m
2026-07-23 SWA4849 ORD → BWI Jul 23, 16:50 UTCJul 23, 18:10 UTC1h 20m
2026-07-23 SWA1355 PHX → SJC Jul 23, 14:25 UTCJul 23, 15:45 UTC1h 20m
2026-07-23 SWA1355 PHX → SJC Jul 23, 11:30 UTCJul 23, 13:25 UTC1h 55m
2026-07-23 SWA1255 PHX → SJC Jul 23, 03:05 UTCJul 23, 03:40 UTC35m
2026-07-22 SWA3125 PHX → AUS Jul 22, 23:50 UTCJul 23, 01:50 UTC2h 0m
2026-07-22 SWA2984 SAN → LAS Jul 22, 19:45 UTCJul 22, 22:00 UTC2h 15m
2026-07-22 SWA2984 SAN → LAS Jul 22, 17:35 UTCJul 22, 18:40 UTC1h 5m
2026-07-22 SWA3901 - Jul 22, 12:30 UTCJul 22, 16:15 UTC3h 45m
2026-07-22 SWA3901 SFO → MDW Jul 22, 12:27 UTCJul 22, 16:12 UTC3h 46m
2026-07-22 SWA2751 HOU → MDW Jul 22, 03:25 UTCJul 22, 05:25 UTC2h 0m
2026-07-21 SWA2697 - Jul 21, 22:45 UTCJul 22, 01:50 UTC3h 5m
2026-07-21 SWA4890 MDW → MCO Jul 21, 19:05 UTCJul 21, 21:40 UTC2h 35m
2026-07-21 SWA4777 ATL → AUS Jul 21, 16:10 UTCJul 21, 18:00 UTC1h 50m
2026-07-21 SWA4777 ATL → AUS Jul 21, 16:10 UTCJul 21, 17:59 UTC1h 49m
2026-07-21 SWA1261 IND → ATL Jul 21, 13:25 UTCJul 21, 15:05 UTC1h 40m
2026-07-21 SWA4324 - Jul 21, 10:10 UTCJul 21, 12:10 UTC2h 0m
2026-07-21 SWA4157 DEN → PIT Jul 21, 03:00 UTCJul 21, 03:50 UTC50m
2026-07-20 SWA3719 - Jul 20, 23:35 UTCJul 21, 01:20 UTC1h 45m
2026-07-20 SWA3719 - Jul 20, 21:35 UTCJul 20, 21:45 UTC10m
2026-07-20 SWA3719 SJU → BWI Jul 20, 21:33 UTCJul 21, 01:17 UTC3h 45m
2026-07-20 SWA1465 ATL → PHL Jul 20, 16:20 UTCJul 20, 18:45 UTC2h 25m
2026-07-20 SWA1349 DAL → MCO Jul 20, 12:35 UTCJul 20, 14:45 UTC2h 10m
2026-07-20 SWA1959 SAN → SJC Jul 20, 10:25 UTCJul 20, 11:20 UTC55m
2026-07-20 SWA4677 - Jul 20, 05:30 UTCJul 20, 06:20 UTC50m
2026-07-20 SWA4377 DCA → DAL Jul 20, 01:00 UTCJul 20, 03:40 UTC2h 40m
2026-07-19 SWA1157 - Jul 19, 22:25 UTCJul 19, 23:45 UTC1h 20m

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 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 AC429B, octal 53041233, decimal 11,289,243.
What flights does AC429B operate?
Mode-S AC429B has broadcast 20 distinct callsigns, including SWA693, SWA4726, SWA419, SWA3952, SWA3393.