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sensors Mode-S transponder

A2C635

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N278WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A2C635
Octal
50543065
Decimal
10,667,573
Country
US
Tail
N278WN
Type
B737
Broadcasting now · callsign SWA3057 · 33,675 ft
Flights observed
718
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A2C635 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2C635 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
SWA2748 Southwest Airlines 7 2026-05-11
SWA2024 - 6 2026-07-12
SWA643 Southwest Airlines 5 2026-05-16
SWA540 - 5 2026-06-28
SWA3719 Southwest Airlines 5 2026-04-25
SWA3542 - 5 2026-07-13
SWA2857 - 5 2026-04-16
SWA2700 - 5 2026-04-13
SWA164 Southwest Airlines 5 2026-06-11
SWA1412 - 5 2026-07-09
SWA1119 Southwest Airlines 5 2026-06-02
SWA786 - 4 2026-07-13
SWA4273 Southwest Airlines 4 2026-06-12
SWA369 Southwest Airlines 4 2026-04-27
SWA3543 - 4 2026-07-12
SWA3463 Southwest Airlines 4 2026-05-11
SWA2951 - 4 2026-07-03
SWA27 Southwest Airlines 4 2026-06-06
SWA250 Southwest Airlines 4 2026-05-09
SWA2396 - 4 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA2286 - Jul 14, 00:35 UTCJul 14, 01:15 UTC40m
2026-07-13 SWA2286 - Jul 13, 20:50 UTCJul 13, 23:15 UTC2h 25m
2026-07-13 SWA786 - Jul 13, 17:20 UTCJul 13, 19:50 UTC2h 30m
2026-07-13 SWA786 BUR → LAS Jul 13, 15:35 UTCJul 13, 16:20 UTC45m
2026-07-13 SWA4843 SJC → BUR Jul 13, 13:45 UTCJul 13, 14:35 UTC50m
2026-07-13 SWA3542 - Jul 13, 05:55 UTCJul 13, 06:45 UTC50m
2026-07-13 SWA3542 TUS → SAN Jul 13, 03:55 UTCJul 13, 04:50 UTC55m
2026-07-13 SWA2377 LAS → TUS Jul 13, 00:46 UTCJul 13, 01:48 UTC1h 2m
2026-07-13 SWA2377 LAS → TUS Jul 13, 00:45 UTCJul 13, 01:45 UTC1h 0m
2026-07-12 SWA3543 - Jul 12, 22:20 UTCJul 12, 23:30 UTC1h 10m
2026-07-12 SWA3543 SJC → LAS Jul 12, 22:19 UTCJul 12, 23:25 UTC1h 6m
2026-07-12 SWA2024 - Jul 12, 20:25 UTCJul 12, 21:20 UTC55m
2026-07-12 SWA2024 - Jul 12, 16:25 UTCJul 12, 19:05 UTC2h 40m
2026-07-12 SWA2024 - Jul 12, 14:10 UTCJul 12, 15:30 UTC1h 20m
2026-07-11 SWA910 AUS → DAL Jul 11, 21:45 UTCJul 11, 22:25 UTC40m
2026-07-11 SWA2127 - Jul 11, 20:00 UTCJul 11, 20:40 UTC40m
2026-07-11 SWA2127 - Jul 11, 15:15 UTCJul 11, 17:35 UTC2h 20m
2026-07-11 SWA2127 - Jul 11, 13:10 UTCJul 11, 14:15 UTC1h 5m
2026-07-11 SWA2155 - Jul 11, 10:40 UTCJul 11, 11:55 UTC1h 15m
2026-07-11 SWA2155 JAX → BNA Jul 11, 10:40 UTCJul 11, 11:56 UTC1h 16m
2026-07-11 SWA4624 - Jul 11, 01:10 UTCJul 11, 02:20 UTC1h 10m
2026-07-10 SWA3126 - Jul 10, 21:25 UTCJul 10, 23:05 UTC1h 40m
2026-07-10 SWA435 MDW → OMA Jul 10, 19:23 UTCJul 10, 20:26 UTC1h 3m
2026-07-10 SWA435 - Jul 10, 16:55 UTCJul 10, 18:25 UTC1h 30m
2026-07-10 SWA313 - Jul 10, 14:30 UTCJul 10, 15:40 UTC1h 10m
2026-07-10 SWA313 AUS → IND Jul 10, 11:30 UTCJul 10, 13:40 UTC2h 10m
2026-07-10 SWA4074 - Jul 10, 04:35 UTCJul 10, 06:00 UTC1h 25m
2026-07-10 SWA4074 - Jul 10, 02:35 UTCJul 10, 03:45 UTC1h 10m
2026-07-09 SWA329 AUS → LAS Jul 9, 23:10 UTCJul 10, 01:30 UTC2h 20m
2026-07-09 SWA329 STL → AUS Jul 9, 20:30 UTCJul 9, 22:05 UTC1h 35m
2026-07-09 SWA1412 - Jul 9, 18:10 UTCJul 9, 19:25 UTC1h 15m
2026-07-09 SWA1412 DAL → STL Jul 9, 18:07 UTCJul 9, 19:22 UTC1h 15m
2026-07-09 SWA1487 FLL → PIT Jul 9, 15:10 UTCJul 9, 16:50 UTC1h 40m
2026-07-09 SWA1487 FLL → PIT Jul 9, 15:05 UTCJul 9, 16:49 UTC1h 45m
2026-07-09 SWA2413 - Jul 9, 07:10 UTCJul 9, 10:30 UTC3h 20m
2026-07-09 SWA2413 LAX → MDW Jul 9, 07:06 UTCJul 9, 10:34 UTC3h 29m
2026-07-08 SWA65 - Jul 8, 23:45 UTCJul 9, 02:20 UTC2h 35m
2026-07-08 SWA5064 AUS → AUS Jul 8, 18:15 UTCJul 8, 21:40 UTC3h 25m
2026-07-08 SWA4555 BNA → MKE Jul 8, 14:30 UTCJul 8, 17:05 UTC2h 35m
2026-07-08 SWA407 SMF → BUR Jul 8, 03:40 UTCJul 8, 04:35 UTC55m
2026-07-08 SWA3603 - Jul 8, 01:50 UTCJul 8, 02:45 UTC55m
2026-07-08 SWA3603 SBA → SMF Jul 8, 01:48 UTCJul 8, 02:51 UTC1h 3m
2026-07-08 SWA697 - Jul 8, 00:05 UTCJul 8, 00:55 UTC50m
2026-07-07 SWA3700 - Jul 7, 22:15 UTCJul 7, 23:15 UTC1h 0m
2026-07-07 SWA397 - Jul 7, 20:25 UTCJul 7, 21:25 UTC1h 0m
2026-07-07 SWA397 - Jul 7, 17:20 UTCJul 7, 19:30 UTC2h 10m
2026-07-07 SWA2752 - Jul 7, 14:25 UTCJul 7, 16:15 UTC1h 50m
2026-07-07 SWA3057 - Jul 7, 02:35 UTCJul 7, 03:35 UTC1h 0m
2026-07-07 SWA2286 LAS → OAK Jul 7, 00:35 UTCJul 7, 01:40 UTC1h 5m
2026-07-06 SWA2286 - Jul 6, 20:40 UTCJul 6, 23:10 UTC2h 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 N278WN page for operator, model, and routing details .

Mode-S A2C635 frequently asked

What is Mode-S code A2C635?
A2C635 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N278WN.
Where is Mode-S A2C635 registered?
Mode-S code A2C635 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 A2C635 broadcasting right now?
Yes. Mode-S A2C635 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C635, octal 50543065, decimal 10,667,573.
What flights does A2C635 operate?
Mode-S A2C635 has broadcast 20 distinct callsigns, including SWA2748, SWA2024, SWA643, SWA540, SWA3719.