Apparatus

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sensors Mode-S transponder

ACFDF4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N936WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
ACFDF4
Octal
53176764
Decimal
11,337,204
Country
US
Tail
N936WN
Type
B737
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
732
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S ACFDF4.

Country allocation

The ICAO 24-bit address ACFDF4 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
SWA246 - 7 2026-07-11
SWA2268 Southwest Airlines 6 2026-05-30
SWA1092 Southwest Airlines 6 2026-04-26
SWA576 Southwest Airlines 5 2026-06-02
SWA300 - 5 2026-06-16
SWA2974 Southwest Airlines 5 2026-05-15
SWA2973 Southwest Airlines 5 2026-06-02
SWA1683 Southwest Airlines 5 2026-04-21
SWA893 Southwest Airlines 4 2026-06-07
SWA534 Southwest Airlines 4 2026-05-30
SWA4354 Southwest Airlines 4 2026-07-24
SWA4348 Southwest Airlines 4 2026-04-25
SWA427 Southwest Airlines 4 2026-07-26
SWA3707 Southwest Airlines 4 2026-06-03
SWA2748 Southwest Airlines 4 2026-05-07
SWA2529 Southwest Airlines 4 2026-07-23
SWA2235 - 4 2026-07-13
SWA1980 Southwest Airlines 4 2026-05-29
SWA1876 Southwest Airlines 4 2026-05-29
SWA1833 Southwest Airlines 4 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA432 MCI → DAL Jul 26, 20:40 UTCJul 26, 21:50 UTC1h 10m
2026-07-26 SWA427 DCA → MSY Jul 26, 17:10 UTCJul 26, 19:45 UTC2h 35m
2026-07-26 SWA427 DCA → MSY Jul 26, 17:10 UTCJul 26, 19:26 UTC2h 16m
2026-07-26 SWA427 DCA → MSY Jul 26, 15:05 UTCJul 26, 15:55 UTC50m
2026-07-26 SWA427 DCA → MSY Jul 26, 12:00 UTCJul 26, 13:55 UTC1h 55m
2026-07-26 SWA863 BWI → PVD Jul 26, 01:35 UTCJul 26, 03:55 UTC2h 20m
2026-07-26 SWA863 BWI → PVD Jul 26, 01:32 UTCJul 26, 03:53 UTC2h 22m
2026-07-25 SWA863 BWI → PVD Jul 25, 22:40 UTCJul 26, 00:40 UTC2h 0m
2026-07-25 SWA947 CVG → MDW Jul 25, 19:10 UTCJul 25, 21:20 UTC2h 10m
2026-07-25 SWA947 CVG → MDW Jul 25, 19:08 UTCJul 25, 21:15 UTC2h 8m
2026-07-25 SWA3458 LAX → SFO Jul 25, 17:00 UTCJul 25, 17:40 UTC40m
2026-07-25 SWA1079 PHL → DAL Jul 25, 15:10 UTCJul 25, 16:00 UTC50m
2026-07-25 SWA4695 PDX → SJC Jul 25, 12:50 UTCJul 25, 13:50 UTC1h 0m
2026-07-25 SWA915 BUR → SJC Jul 25, 00:25 UTCJul 25, 01:30 UTC1h 5m
2026-07-24 SWA4354 SAN → SJC Jul 24, 22:15 UTCJul 24, 23:10 UTC55m
2026-07-24 SWA4354 SAN → SJC Jul 24, 22:14 UTCJul 24, 23:04 UTC51m
2026-07-24 SWA3789 BNA → TPA Jul 24, 20:30 UTCJul 24, 21:20 UTC50m
2026-07-24 SWA3789 BNA → TPA Jul 24, 17:15 UTCJul 24, 19:35 UTC2h 20m
2026-07-24 SWA4692 AUS → SNA Jul 24, 14:05 UTCJul 24, 16:15 UTC2h 10m
2026-07-24 SWA4364 MKE → MCO Jul 24, 11:20 UTCJul 24, 13:00 UTC1h 40m
2026-07-23 SWA2529 MDW → MCO Jul 23, 23:45 UTCJul 24, 00:45 UTC1h 0m
2026-07-23 SWA2529 MDW → MCO Jul 23, 20:20 UTCJul 23, 22:35 UTC2h 15m
2026-07-23 SWA2529 MDW → MCO Jul 23, 17:40 UTCJul 23, 19:10 UTC1h 30m
2026-07-23 SWA2529 MDW → MCO Jul 23, 15:50 UTCJul 23, 16:45 UTC55m
2026-07-23 SWA1781 - Jul 23, 13:25 UTCJul 23, 14:10 UTC45m
2026-07-23 SWA4213 SAN → SJC Jul 23, 02:55 UTCJul 23, 03:55 UTC1h 0m
2026-07-23 SWA4213 SAN → SJC Jul 23, 00:20 UTCJul 23, 02:00 UTC1h 40m
2026-07-22 SWA2631 SNA → OAK Jul 22, 18:30 UTCJul 22, 21:45 UTC3h 15m
2026-07-22 SWA1171 MDW → BOS Jul 22, 15:10 UTCJul 22, 17:00 UTC1h 50m
2026-07-22 SWA1171 MDW → BOS Jul 22, 15:05 UTCJul 22, 16:59 UTC1h 54m
2026-07-22 SWA2988 HRL → HOU Jul 22, 11:55 UTCJul 22, 13:20 UTC1h 25m
2026-07-22 SWA2988 HRL → HOU Jul 22, 11:53 UTCJul 22, 13:20 UTC1h 27m
2026-07-22 SWA4519 LAX → BNA Jul 22, 04:00 UTCJul 22, 05:00 UTC1h 0m
2026-07-22 SWA4519 LAX → BNA Jul 22, 03:57 UTCJul 22, 05:10 UTC1h 13m
2026-07-22 SWA193 MKE → BWI Jul 22, 00:30 UTCJul 22, 01:15 UTC45m
2026-07-21 SWA2089 - Jul 21, 22:55 UTCJul 21, 23:35 UTC40m
2026-07-21 SWA4599 PHL → MDW Jul 21, 19:45 UTCJul 21, 21:30 UTC1h 45m
2026-07-21 SWA1044 BWI → PVD Jul 21, 16:35 UTCJul 21, 18:40 UTC2h 5m
2026-07-21 SWA1044 BWI → PVD Jul 21, 16:31 UTCJul 21, 18:44 UTC2h 13m
2026-07-21 SWA2389 SJC → SNA Jul 21, 13:55 UTCJul 21, 14:55 UTC1h 0m
2026-07-21 SWA4043 DEN → LAX Jul 21, 00:25 UTCJul 21, 01:10 UTC45m
2026-07-20 SWA1228 SAN → LAS Jul 20, 21:35 UTCJul 20, 23:35 UTC2h 0m
2026-07-20 SWA1228 SAN → LAS Jul 20, 21:35 UTCJul 20, 23:36 UTC2h 1m
2026-07-20 SWA1228 SAN → LAS Jul 20, 20:05 UTCJul 20, 20:35 UTC30m
2026-07-20 SWA1228 SAN → LAS Jul 20, 15:20 UTCJul 20, 18:55 UTC3h 35m
2026-07-20 SWA2735 - Jul 20, 12:05 UTCJul 20, 14:00 UTC1h 55m
2026-07-20 SWA1142 DAL → LGA Jul 20, 01:50 UTCJul 20, 03:00 UTC1h 10m
2026-07-20 SWA1142 DAL → LGA Jul 20, 01:47 UTCJul 20, 02:56 UTC1h 9m
2026-07-19 SWA1142 DAL → LGA Jul 19, 21:40 UTCJul 20, 00:45 UTC3h 5m
2026-07-19 SWA4678 AUS → MTJ Jul 19, 18:35 UTCJul 19, 20:20 UTC1h 45m

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 N936WN page for operator, model, and routing details .

Mode-S ACFDF4 frequently asked

What is Mode-S code ACFDF4?
ACFDF4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N936WN.
Where is Mode-S ACFDF4 registered?
Mode-S code ACFDF4 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 ACFDF4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACFDF4, octal 53176764, decimal 11,337,204.
What flights does ACFDF4 operate?
Mode-S ACFDF4 has broadcast 20 distinct callsigns, including SWA246, SWA2268, SWA1092, SWA576, SWA300.