Apparatus

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sensors Mode-S transponder

AC56BA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8941Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC56BA
Octal
53053272
Decimal
11,294,394
Country
US
Tail
N8941Q
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
666
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AC56BA.

Country allocation

The ICAO 24-bit address AC56BA 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
SWA2369 - 8 2026-07-08
SWA444 Southwest Airlines 6 2026-04-22
SWA2680 Southwest Airlines 5 2026-04-16
SWA1327 Southwest Airlines 5 2026-06-12
SWA565 Southwest Airlines 4 2026-06-16
SWA2251 - 4 2026-06-18
SWA1926 Southwest Airlines 4 2026-05-17
SWA164 - 4 2026-06-16
SWA1599 Southwest Airlines 4 2026-06-12
SWA146 - 4 2026-06-30
SWA1335 Southwest Airlines 4 2026-05-03
SWA942 Southwest Airlines 3 2026-05-18
SWA776 Southwest Airlines 3 2026-05-18
SWA699 Southwest Airlines 3 2026-04-28
SWA695 Southwest Airlines 3 2026-06-14
SWA694 Southwest Airlines 3 2026-05-20
SWA586 Southwest Airlines 3 2026-06-09
SWA564 Southwest Airlines 3 2026-05-23
SWA4819 Southwest Airlines 3 2026-06-19
SWA471 Southwest Airlines 3 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA40 - Jul 14, 00:50 UTCJul 14, 02:30 UTC1h 40m
2026-07-13 SWA40 - Jul 13, 22:10 UTCJul 13, 23:15 UTC1h 5m
2026-07-13 SWA709 - Jul 13, 17:40 UTCJul 13, 20:15 UTC2h 35m
2026-07-13 SWA3749 - Jul 13, 13:15 UTCJul 13, 16:00 UTC2h 45m
2026-07-13 SWA1737 DEN → SLC Jul 13, 04:55 UTCJul 13, 05:55 UTC1h 0m
2026-07-13 SWA3617 SEA → DEN Jul 13, 01:20 UTCJul 13, 03:30 UTC2h 10m
2026-07-12 SWA2243 BNA → SEA Jul 12, 19:35 UTCJul 12, 23:45 UTC4h 10m
2026-07-12 SWA3392 - Jul 12, 17:15 UTCJul 12, 18:25 UTC1h 10m
2026-07-12 SWA2732 - Jul 12, 15:55 UTCJul 12, 16:05 UTC10m
2026-07-12 SWA2732 - Jul 12, 13:55 UTCJul 12, 16:05 UTC2h 10m
2026-07-12 SWA2732 MDW → PNS Jul 12, 13:53 UTCJul 12, 15:36 UTC1h 43m
2026-07-12 SWA4035 TPA → MDW Jul 12, 01:30 UTCJul 12, 03:40 UTC2h 10m
2026-07-11 SWA4739 DEN → TPA Jul 11, 21:35 UTCJul 12, 00:30 UTC2h 55m
2026-07-11 SWA4739 DEN → TPA Jul 11, 21:31 UTCJul 12, 00:28 UTC2h 57m
2026-07-11 SWA432 - Jul 11, 18:00 UTCJul 11, 20:20 UTC2h 20m
2026-07-11 SWA432 - Jul 11, 15:30 UTCJul 11, 16:55 UTC1h 25m
2026-07-11 SWA1278 - Jul 11, 12:00 UTCJul 11, 14:10 UTC2h 10m
2026-07-11 SWA1278 CMH → HOU Jul 11, 11:56 UTCJul 11, 14:10 UTC2h 14m
2026-07-11 SWA4755 - Jul 11, 02:55 UTCJul 11, 04:50 UTC1h 55m
2026-07-11 SWA4755 TPA → CMH Jul 11, 02:53 UTCJul 11, 04:46 UTC1h 53m
2026-07-11 SWA686 - Jul 11, 00:30 UTCJul 11, 02:05 UTC1h 35m
2026-07-10 SWA3237 PHX → BNA Jul 10, 20:00 UTCJul 10, 23:00 UTC3h 0m
2026-07-10 SWA4766 OAK → PHX Jul 10, 17:15 UTCJul 10, 18:45 UTC1h 30m
2026-07-10 SWA3848 - Jul 10, 15:15 UTCJul 10, 16:15 UTC1h 0m
2026-07-10 SWA744 DEN → SNA Jul 10, 03:10 UTCJul 10, 05:05 UTC1h 55m
2026-07-09 SWA2161 - Jul 9, 21:35 UTCJul 10, 02:00 UTC4h 25m
2026-07-09 SWA1317 - Jul 9, 18:30 UTCJul 9, 20:25 UTC1h 55m
2026-07-09 SWA1317 DAL → JAX Jul 9, 18:30 UTCJul 9, 20:25 UTC1h 55m
2026-07-09 SWA1317 - Jul 9, 15:05 UTCJul 9, 17:20 UTC2h 15m
2026-07-09 SWA3607 - Jul 9, 10:35 UTCJul 9, 13:55 UTC3h 20m
2026-07-09 SWA1070 - Jul 9, 04:45 UTCJul 9, 07:00 UTC2h 15m
2026-07-09 SWA1070 DEN → SDF Jul 9, 04:41 UTCJul 9, 06:59 UTC2h 18m
2026-07-09 SWA824 STL → DEN Jul 9, 00:15 UTCJul 9, 02:30 UTC2h 15m
2026-07-08 SWA2369 LAS → STL Jul 8, 18:15 UTCJul 8, 21:00 UTC2h 45m
2026-07-08 SWA2369 LAS → STL Jul 8, 18:14 UTCJul 8, 20:54 UTC2h 40m
2026-07-08 SWA2369 SJC → LAS Jul 8, 16:10 UTCJul 8, 17:15 UTC1h 5m
2026-07-08 SWA3858 BWI → BOS Jul 8, 14:05 UTCJul 8, 15:00 UTC55m
2026-07-08 SWA309 - Jul 8, 04:05 UTCJul 8, 04:55 UTC50m
2026-07-08 SWA3696 LAX → SJC Jul 8, 01:40 UTCJul 8, 03:10 UTC1h 30m
2026-07-07 SWA2350 LAS → SJC Jul 7, 23:35 UTCJul 8, 00:40 UTC1h 5m
2026-07-07 SWA2350 SEA → LAS Jul 7, 20:05 UTCJul 7, 22:05 UTC2h 0m
2026-07-07 SWA3051 - Jul 7, 16:25 UTCJul 7, 18:45 UTC2h 20m
2026-07-07 SWA3773 SMF → DEN Jul 7, 13:20 UTCJul 7, 15:10 UTC1h 50m
2026-07-07 SWA4757 MCI → ECP Jul 7, 06:05 UTCJul 7, 07:35 UTC1h 30m
2026-07-07 SWA4757 MCI → ECP Jul 7, 06:05 UTCJul 7, 07:35 UTC1h 30m
2026-07-07 SWA3696 LAX → SJC Jul 7, 02:20 UTCJul 7, 03:50 UTC1h 30m
2026-07-07 SWA3541 - Jul 7, 00:25 UTCJul 7, 01:25 UTC1h 0m
2026-07-06 SWA2883 - Jul 6, 19:35 UTCJul 6, 23:10 UTC3h 35m
2026-07-06 SWA2883 MDW → SAN Jul 6, 19:33 UTCJul 6, 23:08 UTC3h 35m
2026-07-06 SWA3469 RSW → MDW Jul 6, 15:50 UTCJul 6, 18:25 UTC2h 35m

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 N8941Q page for operator, model, and routing details .

Mode-S AC56BA frequently asked

What is Mode-S code AC56BA?
AC56BA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8941Q.
Where is Mode-S AC56BA registered?
Mode-S code AC56BA 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 AC56BA broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC56BA, octal 53053272, decimal 11,294,394.
What flights does AC56BA operate?
Mode-S AC56BA has broadcast 20 distinct callsigns, including SWA2369, SWA444, SWA2680, SWA1327, SWA565.