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sensors Mode-S transponder

A5DD1C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N477WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A5DD1C
Octal
51356434
Decimal
10,870,044
Country
US
Tail
N477WN
Type
B737
Broadcasting now · callsign SWA9017 · 41,000 ft
Flights observed
534
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Current position

A5DD1C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A5DD1C 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
SWA267 Southwest Airlines 8 2026-04-17
SWA4675 Southwest Airlines 5 2026-04-15
SWA41 - 5 2026-07-11
SWA2061 Southwest Airlines 5 2026-04-25
SWA4724 - 4 2026-07-11
SWA3871 Southwest Airlines 4 2026-04-21
SWA3438 Southwest Airlines 4 2026-04-24
SWA3151 - 4 2026-07-03
SWA2396 - 4 2026-06-20
SWA19 - 4 2026-06-22
SWA1706 Southwest Airlines 4 2026-05-29
SWA1188 - 4 2026-06-30
SWA807 Southwest Airlines 3 2026-04-29
SWA8 Southwest Airlines 3 2026-06-13
SWA654 Southwest Airlines 3 2026-06-08
SWA4884 Southwest Airlines 3 2026-07-03
SWA4213 Southwest Airlines 3 2026-06-05
SWA421 Southwest Airlines 3 2026-04-21
SWA391 Southwest Airlines 3 2026-06-01
SWA3845 - 3 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SWA3800 SJC → DEN Jul 13, 00:35 UTCJul 13, 02:45 UTC2h 10m
2026-07-13 SWA3800 SJC → DEN Jul 13, 00:35 UTCJul 13, 02:50 UTC2h 15m
2026-07-12 SWA984 LAS → SJC Jul 12, 22:50 UTCJul 12, 23:49 UTC59m
2026-07-12 SWA984 LAS → SJC Jul 12, 22:50 UTCJul 12, 23:50 UTC1h 0m
2026-07-12 SWA3115 SJC → LAS Jul 12, 20:23 UTCJul 12, 21:31 UTC1h 8m
2026-07-12 SWA3115 SJC → LAS Jul 12, 20:25 UTCJul 12, 21:35 UTC1h 10m
2026-07-12 SWA3115 - Jul 12, 15:20 UTCJul 12, 19:05 UTC3h 45m
2026-07-11 SWA41 - Jul 11, 23:55 UTCJul 12, 02:05 UTC2h 10m
2026-07-11 SWA41 HOU → MDW Jul 11, 23:51 UTCJul 12, 02:02 UTC2h 12m
2026-07-11 SWA41 - Jul 11, 22:05 UTCJul 11, 22:45 UTC40m
2026-07-11 SWA41 - Jul 11, 19:00 UTCJul 11, 20:45 UTC1h 45m
2026-07-11 SWA41 - Jul 11, 16:35 UTCJul 11, 17:55 UTC1h 20m
2026-07-11 SWA3986 - Jul 11, 13:50 UTCJul 11, 15:45 UTC1h 55m
2026-07-11 SWA752 BOS → STL Jul 11, 10:02 UTCJul 11, 12:46 UTC2h 44m
2026-07-11 SWA752 BOS → STL Jul 11, 10:05 UTCJul 11, 12:55 UTC2h 50m
2026-07-11 SWA4724 - Jul 11, 02:20 UTCJul 11, 04:30 UTC2h 10m
2026-07-10 SWA4724 - Jul 10, 23:00 UTCJul 11, 00:30 UTC1h 30m
2026-07-10 SWA4724 - Jul 10, 19:15 UTCJul 10, 21:55 UTC2h 41m
2026-07-10 SWA4724 BUR → LAS Jul 10, 16:50 UTCJul 10, 17:40 UTC50m
2026-07-10 SWA3327 LAS → BUR Jul 10, 14:55 UTCJul 10, 15:35 UTC40m
2026-07-10 SWA3445 - Jul 10, 12:35 UTCJul 10, 13:25 UTC50m
2026-07-10 SWA3445 RNO → LAS Jul 10, 12:32 UTCJul 10, 13:20 UTC48m
2026-07-10 SWA287 - Jul 10, 05:25 UTCJul 10, 06:15 UTC50m
2026-07-10 SWA287 - Jul 10, 03:45 UTCJul 10, 04:30 UTC45m
2026-07-10 SWA2255 - Jul 10, 02:05 UTCJul 10, 02:45 UTC40m
2026-07-09 SWA3846 - Jul 9, 23:15 UTCJul 10, 00:00 UTC45m
2026-07-09 SWA3846 SNA → LAS Jul 9, 23:10 UTCJul 9, 23:54 UTC44m
2026-07-09 SWA3087 - Jul 9, 21:10 UTCJul 9, 22:10 UTC1h 0m
2026-07-09 SWA4893 - Jul 9, 19:00 UTCJul 9, 19:55 UTC55m
2026-07-09 SWA1569 - Jul 9, 15:45 UTCJul 9, 17:45 UTC2h 0m
2026-07-09 SWA1569 DEN → LAX Jul 9, 15:44 UTCJul 9, 17:40 UTC1h 56m
2026-07-09 SWA3615 SEA → DEN Jul 9, 12:25 UTCJul 9, 14:30 UTC2h 5m
2026-07-09 SWA2250 SMF → SEA Jul 9, 05:00 UTCJul 9, 06:30 UTC1h 30m
2026-07-09 SWA2250 PHX → SMF Jul 9, 02:25 UTCJul 9, 04:00 UTC1h 35m
2026-07-09 SWA819 BUR → PHX Jul 9, 00:10 UTCJul 9, 01:15 UTC1h 5m
2026-07-08 SWA3755 - Jul 8, 18:40 UTCJul 8, 22:25 UTC3h 45m
2026-07-08 SWA3409 - Jul 8, 15:15 UTCJul 8, 17:05 UTC1h 50m
2026-07-08 SWA3409 PVD → MDW Jul 8, 15:14 UTCJul 8, 17:04 UTC1h 51m
2026-07-08 SWA4545 - Jul 8, 11:50 UTCJul 8, 14:15 UTC2h 25m
2026-07-08 SWA3083 - Jul 8, 10:05 UTCJul 8, 10:35 UTC30m
2026-07-07 SWA2158 - Jul 7, 20:50 UTCJul 7, 21:35 UTC45m
2026-07-07 SWA1780 OAK → MDW Jul 7, 18:15 UTCJul 7, 20:05 UTC1h 50m
2026-07-07 SWA1780 OAK → MDW Jul 7, 18:10 UTCJul 7, 20:03 UTC1h 53m
2026-07-07 SWA3903 ATL → MDW Jul 7, 15:35 UTCJul 7, 16:55 UTC1h 20m
2026-07-07 SWA9002 MDW → CVG Jul 7, 12:55 UTCJul 7, 14:25 UTC1h 30m
2026-07-07 SWA1894 - Jul 7, 10:40 UTCJul 7, 11:15 UTC35m
2026-07-07 SWA4113 - Jul 7, 05:30 UTCJul 7, 05:55 UTC25m
2026-07-07 SWA3226 PDX → DEN Jul 7, 01:50 UTCJul 7, 03:35 UTC1h 45m
2026-07-07 SWA3226 PDX → DEN Jul 7, 01:30 UTCJul 7, 01:45 UTC15m
2026-07-06 SWA4948 - Jul 6, 23:10 UTCJul 7, 00:40 UTC1h 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 N477WN page for operator, model, and routing details .

Mode-S A5DD1C frequently asked

What is Mode-S code A5DD1C?
A5DD1C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N477WN.
Where is Mode-S A5DD1C registered?
Mode-S code A5DD1C 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 A5DD1C broadcasting right now?
Yes. Mode-S A5DD1C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DD1C, octal 51356434, decimal 10,870,044.
What flights does A5DD1C operate?
Mode-S A5DD1C has broadcast 20 distinct callsigns, including SWA267, SWA4675, SWA41, SWA2061, SWA4724.