Apparatus

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sensors Mode-S transponder

AC5B43

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8957Q · operated by SOUTHWEST AIRLINES CO

Hex
AC5B43
Octal
53055503
Decimal
11,295,555
Country
US
Tail
N8957Q
Type
B38M
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
780
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AC5B43.

Country allocation

The ICAO 24-bit address AC5B43 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
SWA485 - 5 2026-06-28
SWA2391 Southwest Airlines 5 2026-05-14
SWA879 - 4 2026-07-11
SWA714 Southwest Airlines 4 2026-05-22
SWA642 - 4 2026-07-12
SWA4920 Southwest Airlines 4 2026-06-09
SWA29 Southwest Airlines 4 2026-05-18
SWA2684 - 4 2026-04-14
SWA2575 Southwest Airlines 4 2026-04-16
SWA1644 Southwest Airlines 4 2026-05-17
SWA1370 - 4 2026-06-24
SWA1277 - 4 2026-06-22
SWA998 Southwest Airlines 3 2026-04-22
SWA937 - 3 2026-06-19
SWA4470 Southwest Airlines 3 2026-06-11
SWA440 - 3 2026-06-26
SWA4160 - 3 2026-06-19
SWA3937 - 3 2026-07-03
SWA3878 Southwest Airlines 3 2026-04-18
SWA378 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2601 PDX → SJC Jul 26, 20:35 UTCJul 26, 22:30 UTC1h 55m
2026-07-26 SWA681 SAN → SJC Jul 26, 18:30 UTCJul 26, 19:25 UTC55m
2026-07-26 SWA681 SAN → SJC Jul 26, 16:15 UTCJul 26, 17:15 UTC1h 0m
2026-07-26 SWA4803 MDW → LAX Jul 26, 13:10 UTCJul 26, 14:45 UTC1h 35m
2026-07-26 SWA4803 MDW → LAX Jul 26, 13:07 UTCJul 26, 14:47 UTC1h 41m
2026-07-26 SWA3290 MDW → BOS Jul 26, 05:35 UTCJul 26, 06:00 UTC25m
2026-07-26 SWA3290 MDW → BOS Jul 26, 05:34 UTCJul 26, 06:06 UTC32m
2026-07-26 SWA1808 SJC → AUS Jul 26, 02:50 UTCJul 26, 03:55 UTC1h 5m
2026-07-26 SWA1808 SJC → AUS Jul 26, 02:32 UTCJul 26, 03:49 UTC1h 18m
2026-07-26 SWA2630 SAN → OAK Jul 26, 00:15 UTCJul 26, 01:30 UTC1h 15m
2026-07-26 SWA2630 SAN → OAK Jul 26, 00:10 UTCJul 26, 01:45 UTC1h 35m
2026-07-25 SWA3508 MSY → MCO Jul 25, 22:10 UTCJul 25, 23:05 UTC55m
2026-07-25 SWA4967 LGA → MDW Jul 25, 16:50 UTCJul 25, 20:40 UTC3h 50m
2026-07-25 SWA908 SAN → OAK Jul 25, 14:45 UTCJul 25, 15:35 UTC50m
2026-07-25 SWA2324 RNO → OAK Jul 25, 11:25 UTCJul 25, 13:30 UTC2h 5m
2026-07-25 SWA2324 RNO → OAK Jul 25, 11:20 UTCJul 25, 13:17 UTC1h 57m
2026-07-25 SWA2700 BWI → BDL Jul 25, 01:20 UTCJul 25, 02:55 UTC1h 35m
2026-07-24 SWA3624 CMH → STL Jul 24, 23:05 UTCJul 24, 23:50 UTC45m
2026-07-24 SWA3624 CMH → STL Jul 24, 20:15 UTCJul 24, 22:15 UTC2h 0m
2026-07-24 SWA2251 HOU → OAK Jul 24, 16:20 UTCJul 24, 19:00 UTC2h 40m
2026-07-24 SWA2251 HOU → OAK Jul 24, 14:10 UTCJul 24, 14:55 UTC45m
2026-07-24 SWA977 BOI → OAK Jul 24, 02:10 UTCJul 24, 06:40 UTC4h 30m
2026-07-24 SWA977 BOI → OAK Jul 24, 02:08 UTCJul 24, 06:39 UTC4h 31m
2026-07-23 SWA1284 STL → OKC Jul 23, 22:00 UTCJul 24, 00:35 UTC2h 35m
2026-07-23 SWA1284 STL → OKC Jul 23, 21:59 UTCJul 24, 00:37 UTC2h 38m
2026-07-23 SWA4419 FLL → MDW Jul 23, 19:40 UTCJul 23, 20:44 UTC1h 4m
2026-07-23 SWA4419 FLL → MDW Jul 23, 19:45 UTCJul 23, 20:45 UTC1h 0m
2026-07-23 SWA2280 DAL → AUS Jul 23, 15:30 UTCJul 23, 18:35 UTC3h 5m
2026-07-23 SWA2280 DAL → AUS Jul 23, 13:15 UTCJul 23, 14:15 UTC1h 0m
2026-07-23 SWA1662 BOS → BWI Jul 23, 02:35 UTCJul 23, 06:30 UTC3h 55m
2026-07-23 SWA1662 BOS → BWI Jul 23, 02:33 UTCJul 23, 06:24 UTC3h 51m
2026-07-22 SWA2660 LGA → ATL Jul 22, 22:50 UTCJul 23, 01:20 UTC2h 30m
2026-07-22 SWA3120 SJC → DAL Jul 22, 18:55 UTCJul 22, 21:10 UTC2h 15m
2026-07-22 SWA3120 SJC → DAL Jul 22, 18:53 UTCJul 22, 21:07 UTC2h 14m
2026-07-22 SWA2589 DEN → MCO Jul 22, 16:35 UTCJul 22, 17:50 UTC1h 15m
2026-07-22 SWA4059 SAN → SMF Jul 22, 13:55 UTCJul 22, 15:20 UTC1h 25m
2026-07-22 SWA1557 - Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-22 SWA1557 LAS → TUS Jul 22, 04:44 UTCJul 22, 05:39 UTC55m
2026-07-22 SWA3119 RNO → SJC Jul 22, 01:10 UTCJul 22, 03:15 UTC2h 5m
2026-07-21 SWA1653 - Jul 21, 22:55 UTCJul 22, 00:00 UTC1h 5m
2026-07-21 SWA3264 MCO → MSY Jul 21, 20:10 UTCJul 21, 21:40 UTC1h 30m
2026-07-21 SWA3751 DAL → COS Jul 21, 17:45 UTCJul 21, 19:00 UTC1h 15m
2026-07-21 SWA3751 DAL → COS Jul 21, 17:44 UTCJul 21, 19:00 UTC1h 16m
2026-07-21 SWA4027 SMF → GEG Jul 21, 15:45 UTCJul 21, 16:44 UTC59m
2026-07-21 SWA4027 SMF → GEG Jul 21, 15:50 UTCJul 21, 16:45 UTC55m
2026-07-21 SWA4436 BWI → MHT Jul 21, 11:10 UTCJul 21, 14:30 UTC3h 20m
2026-07-21 SWA4436 BWI → MHT Jul 21, 11:07 UTCJul 21, 14:28 UTC3h 22m
2026-07-21 SWA1961 SAN → SJC Jul 21, 02:05 UTCJul 21, 04:55 UTC2h 50m
2026-07-20 SWA3320 SNA → OAK Jul 20, 23:55 UTCJul 21, 01:10 UTC1h 15m
2026-07-20 SWA2774 MCI → MCO Jul 20, 20:00 UTCJul 20, 22:20 UTC2h 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 N8957Q page for operator, model, and routing details .

Mode-S AC5B43 frequently asked

What is Mode-S code AC5B43?
AC5B43 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8957Q.
Where is Mode-S AC5B43 registered?
Mode-S code AC5B43 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 AC5B43 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5B43, octal 53055503, decimal 11,295,555.
What flights does AC5B43 operate?
Mode-S AC5B43 has broadcast 20 distinct callsigns, including SWA485, SWA2391, SWA879, SWA714, SWA642.