Apparatus

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sensors Mode-S transponder

A20E38

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N231WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A20E38
Octal
50407070
Decimal
10,620,472
Country
US
Tail
N231WN
Type
B737
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
767
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S A20E38.

Country allocation

The ICAO 24-bit address A20E38 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
SWA882 - 6 2026-07-12
SWA4723 Southwest Airlines 6 2026-07-23
SWA868 - 5 2026-06-23
SWA4451 - 5 2026-06-30
SWA3438 - 5 2026-06-25
SWA2990 Southwest Airlines 5 2026-05-03
SWA250 Southwest Airlines 5 2026-04-28
SWA247 Southwest Airlines 5 2026-07-22
SWA765 - 4 2026-07-12
SWA755 - 4 2026-04-17
SWA738 Southwest Airlines 4 2026-06-28
SWA4264 Southwest Airlines 4 2026-05-22
SWA3842 Southwest Airlines 4 2026-06-06
SWA30 Southwest Airlines 4 2026-05-09
SWA2712 Southwest Airlines 4 2026-06-10
SWA2583 - 4 2026-07-20
SWA2385 Southwest Airlines 4 2026-05-19
SWA2109 Southwest Airlines 4 2026-06-17
SWA2098 Southwest Airlines 4 2026-04-24
SWA1530 Southwest Airlines 4 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3502 BWI → DAL Jul 26, 19:05 UTCJul 26, 19:55 UTC50m
2026-07-26 SWA3502 BWI → DAL Jul 26, 15:45 UTCJul 26, 17:45 UTC2h 0m
2026-07-26 SWA2088 BWI → ATL Jul 26, 12:55 UTCJul 26, 14:40 UTC1h 45m
2026-07-26 SWA958 DEN → SAT Jul 26, 00:05 UTCJul 26, 02:50 UTC2h 45m
2026-07-26 SWA958 DEN → SAT Jul 26, 00:02 UTCJul 26, 02:47 UTC2h 45m
2026-07-25 SWA4904 BUF → MCO Jul 25, 22:20 UTCJul 25, 23:05 UTC45m
2026-07-25 SWA1039 SNA → DEN Jul 25, 20:55 UTCJul 25, 21:25 UTC30m
2026-07-25 SWA1039 SNA → DEN Jul 25, 20:50 UTCJul 25, 21:23 UTC33m
2026-07-25 SWA2074 OAK → BUR Jul 25, 17:55 UTCJul 25, 19:55 UTC2h 0m
2026-07-25 SWA2074 OAK → BUR Jul 25, 17:52 UTCJul 25, 19:44 UTC1h 52m
2026-07-25 SWA2074 OAK → BUR Jul 25, 15:30 UTCJul 25, 16:50 UTC1h 20m
2026-07-25 SWA2962 GEG → OAK Jul 25, 12:20 UTCJul 25, 14:05 UTC1h 45m
2026-07-25 SWA1374 DEN → AUS Jul 25, 03:30 UTCJul 25, 05:00 UTC1h 30m
2026-07-25 SWA1374 DEN → AUS Jul 25, 00:15 UTCJul 25, 02:40 UTC2h 25m
2026-07-24 SWA114 LAS → SAN Jul 24, 20:50 UTCJul 24, 23:00 UTC2h 10m
2026-07-24 SWA114 LAS → SAN Jul 24, 19:00 UTCJul 24, 19:45 UTC45m
2026-07-24 SWA114 LAS → SAN Jul 24, 13:20 UTCJul 24, 15:10 UTC1h 50m
2026-07-24 SWA114 LAS → SAN Jul 24, 11:25 UTCJul 24, 12:20 UTC55m
2026-07-24 SWA1468 LGA → ATL Jul 24, 04:25 UTCJul 24, 05:15 UTC50m
2026-07-24 SWA1468 LGA → ATL Jul 24, 04:21 UTCJul 24, 05:12 UTC51m
2026-07-24 SWA921 BNA → LGA Jul 24, 00:30 UTCJul 24, 03:10 UTC2h 40m
2026-07-23 SWA921 BNA → LGA Jul 23, 21:25 UTCJul 23, 22:20 UTC55m
2026-07-23 SWA921 BNA → LGA Jul 23, 19:35 UTCJul 23, 20:25 UTC50m
2026-07-23 SWA966 BWI → BOS Jul 23, 17:35 UTCJul 23, 18:20 UTC45m
2026-07-23 SWA4723 BNA → MKE Jul 23, 15:30 UTCJul 23, 16:25 UTC55m
2026-07-23 SWA4723 BNA → MKE Jul 23, 15:25 UTCJul 23, 16:18 UTC53m
2026-07-23 SWA4723 BNA → MKE Jul 23, 12:45 UTCJul 23, 14:10 UTC1h 25m
2026-07-23 SWA3239 LGB → LAS Jul 23, 09:30 UTCJul 23, 11:40 UTC2h 10m
2026-07-23 SWA892 MDW → MCI Jul 23, 02:10 UTCJul 23, 03:10 UTC1h 0m
2026-07-23 SWA892 MDW → MCI Jul 23, 02:09 UTCJul 23, 03:08 UTC1h 0m
2026-07-22 SWA892 MDW → MCI Jul 22, 22:50 UTCJul 23, 00:55 UTC2h 5m
2026-07-22 SWA3995 MCO → PHL Jul 22, 19:05 UTCJul 22, 21:40 UTC2h 35m
2026-07-22 SWA247 PVD → MDW Jul 22, 17:10 UTCJul 22, 17:30 UTC20m
2026-07-22 SWA247 PVD → MDW Jul 22, 14:55 UTCJul 22, 15:35 UTC40m
2026-07-22 SWA247 PVD → MDW Jul 22, 14:54 UTCJul 22, 17:39 UTC2h 45m
2026-07-22 SWA334 LAS → PHX Jul 22, 11:45 UTCJul 22, 13:40 UTC1h 55m
2026-07-22 SWA334 LAS → PHX Jul 22, 11:43 UTCJul 22, 13:31 UTC1h 49m
2026-07-21 SWA4755 TPA → CMH Jul 21, 23:35 UTCJul 22, 01:35 UTC2h 0m
2026-07-21 SWA4755 TPA → CMH Jul 21, 23:30 UTCJul 22, 01:25 UTC1h 55m
2026-07-21 SWA1807 - Jul 21, 19:30 UTCJul 21, 20:45 UTC1h 15m
2026-07-21 SWA183 OAK → LAS Jul 21, 15:55 UTCJul 21, 16:50 UTC55m
2026-07-21 SWA4550 - Jul 21, 13:55 UTCJul 21, 14:40 UTC45m
2026-07-21 SWA4550 RDU → BWI Jul 21, 13:51 UTCJul 21, 14:36 UTC45m
2026-07-21 SWA793 - Jul 21, 02:05 UTCJul 21, 02:55 UTC50m
2026-07-21 SWA793 BWI → RDU Jul 21, 02:03 UTCJul 21, 02:49 UTC46m
2026-07-20 SWA793 STL → BWI Jul 20, 22:45 UTCJul 21, 00:15 UTC1h 29m
2026-07-20 SWA2369 LAS → STL Jul 20, 18:50 UTCJul 20, 21:40 UTC2h 50m
2026-07-20 SWA2369 LAS → STL Jul 20, 18:48 UTCJul 20, 21:36 UTC2h 48m
2026-07-20 SWA2369 SJC → LAS Jul 20, 16:25 UTCJul 20, 17:40 UTC1h 15m
2026-07-20 SWA834 BUR → SJC Jul 20, 14:30 UTCJul 20, 15:15 UTC45m

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 N231WN page for operator, model, and routing details .

Mode-S A20E38 frequently asked

What is Mode-S code A20E38?
A20E38 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N231WN.
Where is Mode-S A20E38 registered?
Mode-S code A20E38 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 A20E38 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20E38, octal 50407070, decimal 10,620,472.
What flights does A20E38 operate?
Mode-S A20E38 has broadcast 20 distinct callsigns, including SWA882, SWA4723, SWA868, SWA4451, SWA3438.