Apparatus

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sensors Mode-S transponder

AC5A4A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8950L · operated by SOUTHWEST AIRLINES CO

Hex
AC5A4A
Octal
53055112
Decimal
11,295,306
Country
US
Tail
N8950L
Type
B38M
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
732
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S AC5A4A.

Country allocation

The ICAO 24-bit address AC5A4A 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
SWA2072 Southwest Airlines 6 2026-06-10
SWA821 - 5 2026-05-15
SWA1211 - 5 2026-07-11
SWA910 - 4 2026-07-14
SWA565 - 4 2026-07-10
SWA4043 Southwest Airlines 4 2026-05-19
SWA3765 - 4 2026-04-13
SWA3373 - 4 2026-07-18
SWA2496 Southwest Airlines 4 2026-07-24
SWA2016 Southwest Airlines 4 2026-06-07
SWA1853 Southwest Airlines 4 2026-04-23
SWA1083 Southwest Airlines 4 2026-07-25
SWA873 Southwest Airlines 3 2026-05-13
SWA872 - 3 2026-07-01
SWA822 Southwest Airlines 3 2026-05-15
SWA505 Southwest Airlines 3 2026-06-01
SWA446 - 3 2026-07-07
SWA4420 Southwest Airlines 3 2026-06-12
SWA3900 Southwest Airlines 3 2026-04-24
SWA354 - 3 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4925 BWI → IND Jul 26, 19:00 UTCJul 26, 21:40 UTC2h 40m
2026-07-26 SWA460 LAS → OAK Jul 26, 14:04 UTCJul 26, 16:36 UTC2h 32m
2026-07-26 SWA460 LAS → OAK Jul 26, 14:05 UTCJul 26, 16:40 UTC2h 35m
2026-07-26 SWA1394 SJC → LAX Jul 26, 11:40 UTCJul 26, 13:05 UTC1h 25m
2026-07-26 SWA1394 SJC → LAX Jul 26, 11:37 UTCJul 26, 13:01 UTC1h 24m
2026-07-26 SWA2058 OAK → BUR Jul 26, 04:00 UTCJul 26, 05:10 UTC1h 10m
2026-07-25 SWA3244 CLT → BWI Jul 25, 22:50 UTCJul 26, 02:50 UTC4h 0m
2026-07-25 SWA1083 OAK → DEN Jul 25, 18:45 UTCJul 25, 21:40 UTC2h 55m
2026-07-25 SWA1083 OAK → DEN Jul 25, 18:40 UTCJul 25, 21:19 UTC2h 39m
2026-07-25 SWA206 ATL → RSW Jul 25, 15:20 UTCJul 25, 17:25 UTC2h 5m
2026-07-25 SWA2276 PVD → BWI Jul 25, 08:05 UTCJul 25, 11:05 UTC3h 0m
2026-07-25 SWA977 BOI → OAK Jul 25, 02:10 UTCJul 25, 06:35 UTC4h 25m
2026-07-25 SWA977 BOI → OAK Jul 25, 02:05 UTCJul 25, 06:29 UTC4h 24m
2026-07-24 SWA1284 STL → OKC Jul 24, 22:10 UTCJul 25, 00:40 UTC2h 30m
2026-07-24 SWA1284 STL → OKC Jul 24, 22:07 UTCJul 25, 00:35 UTC2h 28m
2026-07-24 SWA4419 FLL → MDW Jul 24, 19:55 UTCJul 24, 21:00 UTC1h 5m
2026-07-24 SWA4419 FLL → MDW Jul 24, 19:50 UTCJul 24, 20:50 UTC1h 0m
2026-07-24 SWA2280 DAL → AUS Jul 24, 15:40 UTCJul 24, 18:45 UTC3h 5m
2026-07-24 SWA2280 DAL → AUS Jul 24, 13:10 UTCJul 24, 14:10 UTC1h 0m
2026-07-24 SWA2496 SJC → BUR Jul 24, 03:20 UTCJul 24, 04:05 UTC45m
2026-07-24 SWA2496 SJC → BUR Jul 24, 00:35 UTCJul 24, 02:10 UTC1h 35m
2026-07-23 SWA1427 LGA → BNA Jul 23, 20:40 UTCJul 24, 00:20 UTC3h 40m
2026-07-23 SWA1427 LGA → BNA Jul 23, 18:00 UTCJul 23, 19:20 UTC1h 20m
2026-07-23 SWA1701 LAX → SJC Jul 23, 13:50 UTCJul 23, 16:20 UTC2h 30m
2026-07-23 SWA2402 GEG → SJC Jul 23, 07:20 UTCJul 23, 10:15 UTC2h 55m
2026-07-23 SWA2402 GEG → SJC Jul 23, 07:18 UTCJul 23, 10:20 UTC3h 3m
2026-07-23 SWA2035 DAL → TUL Jul 23, 05:15 UTCJul 23, 06:15 UTC1h 0m
2026-07-23 SWA3208 BUR → PHX Jul 23, 01:25 UTCJul 23, 03:40 UTC2h 15m
2026-07-22 SWA4026 MDW → RSW Jul 22, 22:00 UTCJul 23, 00:15 UTC2h 15m
2026-07-22 SWA4026 MDW → RSW Jul 22, 21:59 UTCJul 23, 00:12 UTC2h 14m
2026-07-22 SWA2492 MDW → PVD Jul 22, 19:20 UTCJul 22, 20:50 UTC1h 30m
2026-07-22 SWA2492 MDW → PVD Jul 22, 17:20 UTCJul 22, 18:20 UTC1h 0m
2026-07-22 SWA3308 BWI → CLT Jul 22, 15:23 UTCJul 22, 16:19 UTC56m
2026-07-22 SWA3308 BWI → CLT Jul 22, 15:25 UTCJul 22, 16:20 UTC55m
2026-07-22 SWA4224 PHL → TPA Jul 22, 13:20 UTCJul 22, 14:00 UTC40m
2026-07-22 SWA4224 PHL → TPA Jul 22, 13:01 UTCJul 22, 13:58 UTC57m
2026-07-22 SWA4340 BWI → BOS Jul 22, 04:55 UTCJul 22, 05:25 UTC30m
2026-07-22 SWA4340 BWI → BOS Jul 22, 04:55 UTCJul 22, 06:13 UTC1h 18m
2026-07-22 SWA1365 OAK → LAX Jul 22, 00:15 UTCJul 22, 04:00 UTC3h 45m
2026-07-22 SWA1365 OAK → LAX Jul 22, 00:11 UTCJul 22, 03:50 UTC3h 39m
2026-07-21 SWA481 SAN → OAK Jul 21, 22:20 UTCJul 21, 23:20 UTC1h 0m
2026-07-21 SWA481 SAN → OAK Jul 21, 22:19 UTCJul 21, 23:11 UTC52m
2026-07-21 SWA965 MSY → BNA Jul 21, 19:30 UTCJul 21, 20:45 UTC1h 15m
2026-07-21 SWA965 MSY → BNA Jul 21, 19:27 UTCJul 21, 20:40 UTC1h 13m
2026-07-21 SWA1871 ONT → SJC Jul 21, 16:45 UTCJul 21, 18:25 UTC1h 40m
2026-07-21 SWA990 MDW → DCA Jul 21, 13:20 UTCJul 21, 15:40 UTC2h 20m
2026-07-21 SWA776 PHX → DAL Jul 21, 10:15 UTCJul 21, 12:10 UTC1h 55m
2026-07-21 SWA4619 PHX → CVG Jul 21, 02:10 UTCJul 21, 04:10 UTC2h 0m
2026-07-20 SWA2679 PHL → STL Jul 20, 23:30 UTCJul 21, 01:20 UTC1h 49m
2026-07-20 SWA2679 PHL → STL Jul 20, 23:28 UTCJul 21, 01:20 UTC1h 52m

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 N8950L page for operator, model, and routing details .

Mode-S AC5A4A frequently asked

What is Mode-S code AC5A4A?
AC5A4A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8950L.
Where is Mode-S AC5A4A registered?
Mode-S code AC5A4A 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 AC5A4A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5A4A, octal 53055112, decimal 11,295,306.
What flights does AC5A4A operate?
Mode-S AC5A4A has broadcast 20 distinct callsigns, including SWA2072, SWA821, SWA1211, SWA910, SWA565.