Apparatus

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sensors Mode-S transponder

A51F0F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N429WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A51F0F
Octal
51217417
Decimal
10,821,391
Country
US
Tail
N429WN
Type
B737
Broadcasting now · callsign SWA2464 · 39,000 ft
Flights observed
663
Distinct callsigns
20
Country
US
Last broadcast
29m ago

Current position

A51F0F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A51F0F 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
SWA1655 Southwest Airlines 8 2026-04-17
SWA2278 Southwest Airlines 7 2026-04-14
SWA3816 - 6 2026-07-02
SWA3335 Southwest Airlines 6 2026-05-27
SWA121 - 6 2026-07-01
SWA955 - 5 2026-06-22
SWA519 - 5 2026-06-22
SWA4272 Southwest Airlines 5 2026-05-29
SWA345 - 5 2026-07-04
SWA1375 Southwest Airlines 5 2026-05-04
SWA11 Southwest Airlines 5 2026-06-16
SWA38 Southwest Airlines 4 2026-06-03
SWA297 - 4 2026-06-22
SWA2004 Southwest Airlines 4 2026-05-30
SWA994 Southwest Airlines 3 2026-05-30
SWA991 Southwest Airlines 3 2026-04-17
SWA865 Southwest Airlines 3 2026-05-16
SWA778 Southwest Airlines 3 2026-06-07
SWA4866 - 3 2026-07-09
SWA4607 Southwest Airlines 3 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA2464 - Jul 14, 17:15 UTCJul 14, 17:45 UTC30m
2026-07-14 SWA1473 BNA → MDW Jul 14, 14:45 UTCJul 14, 15:50 UTC1h 5m
2026-07-14 SWA1473 - Jul 14, 12:30 UTCJul 14, 13:25 UTC55m
2026-07-14 SWA2982 - Jul 14, 03:45 UTCJul 14, 04:45 UTC1h 0m
2026-07-14 SWA2982 BNA → VPS Jul 14, 03:45 UTCJul 14, 04:46 UTC1h 1m
2026-07-14 SWA2982 - Jul 14, 01:00 UTCJul 14, 01:40 UTC40m
2026-07-13 SWA526 - Jul 13, 23:30 UTCJul 14, 00:20 UTC50m
2026-07-13 SWA526 DAL → BNA Jul 13, 21:10 UTCJul 13, 22:35 UTC1h 25m
2026-07-13 SWA3595 - Jul 13, 17:45 UTCJul 13, 19:55 UTC2h 10m
2026-07-13 SWA667 BNA → SAV Jul 13, 15:35 UTCJul 13, 16:40 UTC1h 5m
2026-07-13 SWA2913 - Jul 13, 13:35 UTCJul 13, 14:30 UTC55m
2026-07-13 SWA580 - Jul 13, 04:30 UTCJul 13, 05:05 UTC35m
2026-07-13 SWA580 BNA → MEM Jul 13, 04:29 UTCJul 13, 05:07 UTC38m
2026-07-13 SWA2071 - Jul 13, 02:05 UTCJul 13, 03:15 UTC1h 10m
2026-07-12 SWA1146 - Jul 12, 23:55 UTCJul 13, 01:10 UTC1h 15m
2026-07-12 SWA49 - Jul 12, 21:05 UTCJul 12, 23:00 UTC1h 55m
2026-07-12 SWA4108 - Jul 12, 18:45 UTCJul 12, 19:55 UTC1h 10m
2026-07-12 SWA3970 - Jul 12, 15:35 UTCJul 12, 17:40 UTC2h 5m
2026-07-12 SWA4854 DEN → MCO Jul 12, 11:25 UTCJul 12, 14:25 UTC3h 0m
2026-07-12 SWA4854 DEN → MCO Jul 12, 11:21 UTCJul 12, 14:22 UTC3h 1m
2026-07-12 SWA4176 STL → DEN Jul 12, 02:00 UTCJul 12, 03:48 UTC1h 48m
2026-07-12 SWA4176 - Jul 12, 02:01 UTCJul 12, 03:45 UTC1h 45m
2026-07-11 SWA1205 - Jul 11, 21:40 UTCJul 11, 23:40 UTC2h 0m
2026-07-11 SWA627 - Jul 11, 17:00 UTCJul 11, 17:50 UTC50m
2026-07-11 SWA627 AUS → SJD Jul 11, 16:59 UTCJul 11, 19:01 UTC2h 2m
2026-07-11 SWA1680 BNA → AUS Jul 11, 13:40 UTCJul 11, 15:20 UTC1h 40m
2026-07-11 SWA4429 DEN → BNA Jul 11, 04:50 UTCJul 11, 06:55 UTC2h 5m
2026-07-11 SWA4429 DEN → BNA Jul 11, 04:46 UTCJul 11, 06:55 UTC2h 9m
2026-07-11 SWA4333 - Jul 11, 02:05 UTCJul 11, 03:35 UTC1h 30m
2026-07-10 SWA4333 - Jul 10, 22:15 UTCJul 10, 22:55 UTC40m
2026-07-10 SWA4333 - Jul 10, 20:35 UTCJul 10, 21:20 UTC45m
2026-07-10 SWA250 - Jul 10, 18:45 UTCJul 10, 19:35 UTC50m
2026-07-10 SWA250 - Jul 10, 16:50 UTCJul 10, 17:35 UTC45m
2026-07-10 SWA4743 - Jul 10, 15:05 UTCJul 10, 15:50 UTC45m
2026-07-10 SWA4497 - Jul 10, 11:55 UTCJul 10, 13:55 UTC2h 0m
2026-07-10 SWA3226 PSQ → MDW Jul 10, 03:55 UTCJul 10, 05:40 UTC1h 45m
2026-07-10 SWA3226 - Jul 10, 03:15 UTCJul 10, 03:40 UTC25m
2026-07-10 SWA4948 - Jul 10, 01:10 UTCJul 10, 03:05 UTC1h 55m
2026-07-09 SWA4516 RDU → MDW Jul 9, 18:20 UTCJul 9, 19:50 UTC1h 30m
2026-07-09 SWA4516 AUS → RDU Jul 9, 14:35 UTCJul 9, 17:05 UTC2h 30m
2026-07-09 SWA4866 - Jul 9, 11:15 UTCJul 9, 13:20 UTC2h 5m
2026-07-09 SWA3406 - Jul 9, 02:30 UTCJul 9, 03:20 UTC50m
2026-07-09 SWA3406 STL → MKE Jul 9, 02:30 UTCJul 9, 03:21 UTC51m
2026-07-09 SWA2533 - Jul 9, 00:10 UTCJul 9, 01:35 UTC1h 25m
2026-07-08 SWA277 - Jul 8, 22:05 UTCJul 8, 23:25 UTC1h 20m
2026-07-08 SWA277 DAL → PNS Jul 8, 22:02 UTCJul 8, 23:21 UTC1h 19m
2026-07-08 SWA1276 - Jul 8, 20:15 UTCJul 8, 21:05 UTC50m
2026-07-08 SWA1276 - Jul 8, 17:20 UTCJul 8, 18:45 UTC1h 25m
2026-07-08 SWA1276 - Jul 8, 14:35 UTCJul 8, 15:30 UTC55m
2026-07-08 SWA1696 - Jul 8, 04:15 UTCJul 8, 06:10 UTC1h 55m

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 N429WN page for operator, model, and routing details .

Mode-S A51F0F frequently asked

What is Mode-S code A51F0F?
A51F0F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N429WN.
Where is Mode-S A51F0F registered?
Mode-S code A51F0F 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 A51F0F broadcasting right now?
Yes. Mode-S A51F0F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51F0F, octal 51217417, decimal 10,821,391.
What flights does A51F0F operate?
Mode-S A51F0F has broadcast 20 distinct callsigns, including SWA1655, SWA2278, SWA3816, SWA3335, SWA121.