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sensors Mode-S transponder

ACA01A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N912WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
ACA01A
Octal
53120032
Decimal
11,313,178
Country
US
Tail
N912WN
Type
B737
Broadcasting now · callsign SWA3574 · 1,425 ft
Flights observed
714
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Current position

ACA01A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ACA01A 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
SWA114 - 9 2026-07-13
SWA3532 Southwest Airlines 7 2026-04-18
SWA1080 Southwest Airlines 7 2026-04-15
SWA1476 Southwest Airlines 6 2026-05-07
SWA1374 - 6 2026-07-14
SWA470 Southwest Airlines 5 2026-04-28
SWA426 - 5 2026-06-27
SWA3281 - 5 2026-07-10
SWA2384 Southwest Airlines 5 2026-06-12
SWA2227 Southwest Airlines 5 2026-05-10
SWA1198 Southwest Airlines 5 2026-07-26
SWA868 - 4 2026-07-17
SWA860 Southwest Airlines 4 2026-05-26
SWA4020 Southwest Airlines 4 2026-05-12
SWA3731 Southwest Airlines 4 2026-05-09
SWA3563 Southwest Airlines 4 2026-07-23
SWA3519 - 4 2026-07-11
SWA2886 Southwest Airlines 4 2026-04-17
SWA1975 Southwest Airlines 4 2026-04-13
SWA174 - 4 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1496 DAL → SMF Jul 26, 19:20 UTCJul 26, 21:35 UTC2h 15m
2026-07-26 SWA1198 SJC → BUR Jul 26, 16:10 UTCJul 26, 17:55 UTC1h 45m
2026-07-26 SWA1198 SJC → BUR Jul 26, 16:06 UTCJul 26, 17:53 UTC1h 48m
2026-07-26 SWA1198 SJC → BUR Jul 26, 13:10 UTCJul 26, 15:10 UTC2h 0m
2026-07-25 SWA3033 DEN → LGA Jul 25, 19:25 UTCJul 25, 22:20 UTC2h 55m
2026-07-25 SWA3033 DEN → LGA Jul 25, 19:21 UTCJul 25, 22:13 UTC2h 52m
2026-07-25 SWA8502 OAK → PHX Jul 25, 18:05 UTCJul 25, 18:20 UTC15m
2026-07-25 SWA4356 SJC → GEG Jul 25, 16:15 UTCJul 25, 17:20 UTC1h 5m
2026-07-25 SWA2310 SAN → OAK Jul 25, 13:50 UTCJul 25, 14:40 UTC50m
2026-07-25 SWA4876 IND → TPA Jul 25, 03:10 UTCJul 25, 04:05 UTC55m
2026-07-25 SWA4485 AUS → SMF Jul 25, 01:00 UTCJul 25, 02:15 UTC1h 15m
2026-07-24 SWA4647 STL → BOS Jul 24, 23:09 UTCJul 25, 00:05 UTC56m
2026-07-24 SWA4647 STL → BOS Jul 24, 23:10 UTCJul 25, 00:00 UTC50m
2026-07-24 SWA1382 LGA → MDW Jul 24, 20:40 UTCJul 24, 21:30 UTC50m
2026-07-24 SWA1382 LGA → MDW Jul 24, 17:35 UTCJul 24, 19:35 UTC2h 0m
2026-07-24 SWA3906 IAD → DEN Jul 24, 13:50 UTCJul 24, 16:35 UTC2h 45m
2026-07-24 SWA3506 PHX → OAK Jul 24, 04:30 UTCJul 24, 05:45 UTC1h 15m
2026-07-24 SWA792 MDW → SAV Jul 24, 02:45 UTCJul 24, 03:30 UTC45m
2026-07-24 SWA792 MDW → SAV Jul 24, 00:40 UTCJul 24, 01:20 UTC40m
2026-07-23 SWA3563 LGA → MDW Jul 23, 22:50 UTCJul 23, 23:40 UTC50m
2026-07-23 SWA3563 LGA → MDW Jul 23, 19:30 UTCJul 23, 21:35 UTC2h 5m
2026-07-23 SWA3563 LGA → MDW Jul 23, 16:45 UTCJul 23, 18:25 UTC1h 40m
2026-07-23 SWA3563 LGA → MDW Jul 23, 14:55 UTCJul 23, 15:45 UTC50m
2026-07-23 SWA4310 SJC → SEA Jul 23, 11:30 UTCJul 23, 13:50 UTC2h 20m
2026-07-23 SWA4086 MIA → STL Jul 23, 09:35 UTCJul 23, 10:10 UTC35m
2026-07-23 SWA1483 MDW → CLE Jul 23, 01:30 UTCJul 23, 02:10 UTC40m
2026-07-22 SWA4311 DEN → GRR Jul 22, 22:30 UTCJul 22, 23:55 UTC1h 25m
2026-07-22 SWA3536 - Jul 22, 20:25 UTCJul 22, 21:30 UTC1h 5m
2026-07-22 SWA3536 SJC → DAL Jul 22, 15:55 UTCJul 22, 19:00 UTC3h 5m
2026-07-22 SWA3536 - Jul 22, 13:45 UTCJul 22, 14:45 UTC1h 0m
2026-07-22 SWA1917 HOU → MCI Jul 22, 03:50 UTCJul 22, 04:40 UTC50m
2026-07-21 SWA3306 BWI → MSY Jul 21, 23:50 UTCJul 22, 02:35 UTC2h 45m
2026-07-21 SWA174 IND → MCO Jul 21, 21:00 UTCJul 21, 22:45 UTC1h 45m
2026-07-21 SWA174 IND → MCO Jul 21, 18:15 UTCJul 21, 20:05 UTC1h 50m
2026-07-21 SWA174 - Jul 21, 16:10 UTCJul 21, 16:55 UTC45m
2026-07-21 SWA174 - Jul 21, 14:10 UTCJul 21, 15:00 UTC50m
2026-07-21 SWA4107 SJC → BUR Jul 21, 04:45 UTCJul 21, 05:40 UTC55m
2026-07-21 SWA820 BUR → PHX Jul 21, 02:05 UTCJul 21, 03:15 UTC1h 10m
2026-07-21 SWA3663 PHL → STL Jul 21, 00:10 UTCJul 21, 01:00 UTC50m
2026-07-20 SWA4883 BUR → SJC Jul 20, 22:25 UTCJul 20, 23:10 UTC45m
2026-07-20 SWA2203 STL → TPA Jul 20, 20:30 UTCJul 20, 21:20 UTC50m
2026-07-20 SWA2203 STL → TPA Jul 20, 20:29 UTCJul 20, 21:15 UTC46m
2026-07-20 SWA1097 - Jul 20, 17:50 UTCJul 20, 18:55 UTC1h 5m
2026-07-20 SWA3555 - Jul 20, 15:55 UTCJul 20, 16:55 UTC1h 0m
2026-07-20 SWA3555 SMF → SAN Jul 20, 13:45 UTCJul 20, 15:00 UTC1h 15m
2026-07-20 SWA854 LAS → DAL Jul 20, 04:20 UTCJul 20, 05:20 UTC1h 0m
2026-07-20 SWA3360 LAS → DEN Jul 20, 02:40 UTCJul 20, 03:40 UTC1h 0m
2026-07-20 SWA1402 - Jul 20, 00:20 UTCJul 20, 01:30 UTC1h 10m
2026-07-19 SWA1402 - Jul 19, 20:35 UTCJul 19, 23:15 UTC2h 40m
2026-07-19 SWA2114 - Jul 19, 15:40 UTCJul 19, 19:10 UTC3h 30m

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 N912WN page for operator, model, and routing details .

Mode-S ACA01A frequently asked

What is Mode-S code ACA01A?
ACA01A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N912WN.
Where is Mode-S ACA01A registered?
Mode-S code ACA01A 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 ACA01A broadcasting right now?
Yes. Mode-S ACA01A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACA01A, octal 53120032, decimal 11,313,178.
What flights does ACA01A operate?
Mode-S ACA01A has broadcast 20 distinct callsigns, including SWA114, SWA3532, SWA1080, SWA1476, SWA1374.