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sensors Mode-S transponder

AD4CF2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N956WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
AD4CF2
Octal
53246362
Decimal
11,357,426
Country
US
Tail
N956WN
Type
B737
Transponder active on ground
Flights observed
706
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AD4CF2.

Country allocation

The ICAO 24-bit address AD4CF2 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
SWA2137 Southwest Airlines 7 2026-06-02
SWA1723 Southwest Airlines 7 2026-06-10
SWA509 Southwest Airlines 6 2026-04-14
SWA2970 Southwest Airlines 6 2026-05-17
SWA294 - 6 2026-06-25
SWA285 - 6 2026-07-04
SWA1880 Southwest Airlines 6 2026-05-21
SWA988 Southwest Airlines 4 2026-05-27
SWA4208 Southwest Airlines 4 2026-05-05
SWA3958 Southwest Airlines 4 2026-04-20
SWA3563 Southwest Airlines 4 2026-06-04
SWA3522 Southwest Airlines 4 2026-06-01
SWA3517 Southwest Airlines 4 2026-05-09
SWA3438 Southwest Airlines 4 2026-05-29
SWA3014 Southwest Airlines 4 2026-06-13
SWA2418 - 4 2026-06-26
SWA1771 Southwest Airlines 4 2026-06-12
SWA1645 Southwest Airlines 4 2026-06-14
SWA1559 - 4 2026-07-05
SWA1432 Southwest Airlines 4 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA818 - Jul 14, 14:25 UTCJul 14, 15:55 UTC1h 30m
2026-07-14 SWA3127 - Jul 14, 11:35 UTCJul 14, 12:45 UTC1h 10m
2026-07-14 SWA1659 DEN → OMA Jul 14, 01:58 UTCJul 14, 03:01 UTC1h 3m
2026-07-14 SWA1659 - Jul 14, 02:00 UTCJul 14, 03:05 UTC1h 5m
2026-07-13 SWA2993 SMF → DEN Jul 13, 22:50 UTCJul 14, 00:55 UTC2h 5m
2026-07-13 SWA2993 SMF → DEN Jul 13, 22:50 UTCJul 14, 00:49 UTC1h 59m
2026-07-13 SWA4966 BUR → SMF Jul 13, 21:10 UTCJul 13, 22:05 UTC55m
2026-07-13 SWA4966 BUR → SMF Jul 13, 21:10 UTCJul 13, 22:04 UTC54m
2026-07-13 SWA1268 - Jul 13, 19:15 UTCJul 13, 20:15 UTC1h 0m
2026-07-13 SWA1268 DAL → OAK Jul 13, 15:20 UTCJul 13, 18:20 UTC3h 0m
2026-07-13 SWA4 - Jul 13, 12:15 UTCJul 13, 13:55 UTC1h 40m
2026-07-12 SWA4203 - Jul 12, 22:40 UTCJul 13, 00:55 UTC2h 15m
2026-07-12 SWA4203 PHX → HOU Jul 12, 22:38 UTCJul 13, 00:55 UTC2h 18m
2026-07-12 SWA366 DAL → PHX Jul 12, 18:35 UTCJul 12, 20:30 UTC1h 55m
2026-07-12 SWA366 - Jul 12, 16:01 UTCJul 12, 17:35 UTC1h 35m
2026-07-12 SWA366 - Jul 12, 13:25 UTCJul 12, 14:25 UTC1h 0m
2026-07-12 SWA4568 - Jul 12, 10:40 UTCJul 12, 11:50 UTC1h 10m
2026-07-12 SWA1306 DEN → CLE Jul 12, 00:45 UTCJul 12, 03:11 UTC2h 26m
2026-07-12 SWA1306 DEN → CLE Jul 12, 00:45 UTCJul 12, 03:15 UTC2h 30m
2026-07-11 SWA1222 COS → DEN Jul 11, 23:15 UTCJul 11, 23:45 UTC30m
2026-07-11 SWA1222 DAL → SMF Jul 11, 23:15 UTCJul 11, 23:36 UTC21m
2026-07-11 SWA1228 DEN → COS Jul 11, 21:50 UTCJul 11, 22:05 UTC15m
2026-07-11 SWA1410 - Jul 11, 19:30 UTCJul 11, 20:45 UTC1h 15m
2026-07-11 SWA1410 - Jul 11, 15:45 UTCJul 11, 18:00 UTC2h 15m
2026-07-11 SWA2569 - Jul 11, 13:25 UTCJul 11, 14:50 UTC1h 25m
2026-07-11 SWA2569 MDW → DCA Jul 11, 13:23 UTCJul 11, 14:44 UTC1h 21m
2026-07-11 SWA2133 - Jul 11, 10:45 UTCJul 11, 11:20 UTC35m
2026-07-11 SWA3190 - Jul 11, 04:30 UTCJul 11, 05:05 UTC35m
2026-07-11 SWA3226 - Jul 11, 01:25 UTCJul 11, 03:15 UTC1h 50m
2026-07-11 SWA3226 PHL → MDW Jul 11, 01:23 UTCJul 11, 03:10 UTC1h 48m
2026-07-11 SWA3226 - Jul 11, 00:50 UTCJul 11, 00:55 UTC5m
2026-07-10 SWA4948 - Jul 10, 22:05 UTCJul 11, 00:00 UTC1h 55m
2026-07-10 SWA4516 RDU → MDW Jul 10, 18:25 UTCJul 10, 20:00 UTC1h 35m
2026-07-10 SWA4516 RDU → MDW Jul 10, 18:20 UTCJul 10, 19:59 UTC1h 39m
2026-07-10 SWA4516 AUS → RDU Jul 10, 14:25 UTCJul 10, 17:05 UTC2h 40m
2026-07-10 SWA4866 - Jul 10, 11:15 UTCJul 10, 13:25 UTC2h 10m
2026-07-10 SWA4866 MKE → AUS Jul 10, 11:10 UTCJul 10, 13:26 UTC2h 16m
2026-07-10 SWA3406 - Jul 10, 02:50 UTCJul 10, 03:35 UTC45m
2026-07-10 SWA747 CLE → STL Jul 10, 00:25 UTCJul 10, 01:40 UTC1h 15m
2026-07-10 SWA747 CLE → STL Jul 10, 00:25 UTCJul 10, 01:36 UTC1h 11m
2026-07-09 SWA747 LAS → CLE Jul 9, 20:10 UTCJul 9, 23:35 UTC3h 25m
2026-07-09 SWA1097 AVW → LAS Jul 9, 18:00 UTCJul 9, 18:50 UTC50m
2026-07-09 SWA3555 - Jul 9, 15:55 UTCJul 9, 16:55 UTC1h 0m
2026-07-09 SWA3555 - Jul 9, 13:40 UTCJul 9, 14:45 UTC1h 5m
2026-07-09 SWA1651 LAS → SMF Jul 9, 03:20 UTCJul 9, 04:25 UTC1h 5m
2026-07-08 SWA1651 DCA → LAS Jul 8, 21:55 UTCJul 9, 02:25 UTC4h 30m
2026-07-08 SWA1124 MCO → DCA Jul 8, 18:35 UTCJul 8, 20:20 UTC1h 45m
2026-07-08 SWA1171 - Jul 8, 15:15 UTCJul 8, 17:05 UTC1h 50m
2026-07-08 SWA1171 BWI → MCO Jul 8, 15:13 UTCJul 8, 17:03 UTC1h 50m
2026-07-08 SWA1507 - Jul 8, 12:30 UTCJul 8, 13:40 UTC1h 10m

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 N956WN page for operator, model, and routing details .

Mode-S AD4CF2 frequently asked

What is Mode-S code AD4CF2?
AD4CF2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N956WN.
Where is Mode-S AD4CF2 registered?
Mode-S code AD4CF2 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 AD4CF2 broadcasting right now?
Mode-S AD4CF2 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4CF2, octal 53246362, decimal 11,357,426.
What flights does AD4CF2 operate?
Mode-S AD4CF2 has broadcast 20 distinct callsigns, including SWA2137, SWA1723, SWA509, SWA2970, SWA294.