Apparatus

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sensors Mode-S transponder

A528D6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N431WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A528D6
Octal
51224326
Decimal
10,823,894
Country
US
Tail
N431WN
Type
B737
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
731
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S A528D6.

Country allocation

The ICAO 24-bit address A528D6 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
SWA1577 - 10 2026-07-01
SWA1676 Southwest Airlines 8 2026-05-30
SWA3616 Southwest Airlines 7 2026-04-29
SWA300 - 5 2026-07-18
SWA2720 Southwest Airlines 5 2026-05-15
SWA1311 Southwest Airlines 5 2026-07-20
SWA1031 - 5 2026-06-26
SWA988 Southwest Airlines 4 2026-04-26
SWA684 - 4 2026-06-15
SWA534 Southwest Airlines 4 2026-06-02
SWA4524 Southwest Airlines 4 2026-05-30
SWA4188 Southwest Airlines 4 2026-04-15
SWA4108 - 4 2026-07-20
SWA2529 Southwest Airlines 4 2026-06-12
SWA2485 Southwest Airlines 4 2026-06-29
SWA1771 - 4 2026-07-13
SWA1723 Southwest Airlines 4 2026-05-19
SWA1467 - 4 2026-07-02
SWA1118 Southwest Airlines 4 2026-04-28
SWA1104 Southwest Airlines 4 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4271 HDN → BNA Jul 26, 18:40 UTCJul 26, 20:50 UTC2h 10m
2026-07-26 SWA2733 RDU → BWI Jul 26, 15:30 UTCJul 26, 17:30 UTC2h 0m
2026-07-26 SWA2733 RDU → BWI Jul 26, 15:30 UTCJul 26, 17:29 UTC1h 59m
2026-07-26 SWA1058 ATL → MCO Jul 26, 01:25 UTCJul 26, 02:35 UTC1h 10m
2026-07-26 SWA1058 ATL → MCO Jul 26, 01:22 UTCJul 26, 02:31 UTC1h 10m
2026-07-25 SWA4728 SLC → OAK Jul 25, 22:50 UTCJul 26, 00:15 UTC1h 25m
2026-07-25 SWA2983 BWI → MHT Jul 25, 20:30 UTCJul 25, 21:45 UTC1h 15m
2026-07-25 SWA382 PHX → RNO Jul 25, 18:10 UTCJul 25, 19:25 UTC1h 15m
2026-07-25 SWA3850 CMH → MCO Jul 25, 15:25 UTCJul 25, 17:05 UTC1h 40m
2026-07-25 SWA4204 MCO → ORD Jul 25, 12:15 UTCJul 25, 13:20 UTC1h 5m
2026-07-25 SWA4339 BWI → ALB Jul 25, 04:05 UTCJul 25, 06:20 UTC2h 15m
2026-07-25 SWA1565 SAN → OAK Jul 25, 01:35 UTCJul 25, 03:10 UTC1h 35m
2026-07-24 SWA1146 DAL → MKE Jul 24, 23:05 UTCJul 25, 00:25 UTC1h 20m
2026-07-24 SWA1146 DAL → MKE Jul 24, 23:02 UTCJul 25, 00:17 UTC1h 15m
2026-07-24 SWA1146 DAL → MKE Jul 24, 19:55 UTCJul 24, 22:05 UTC2h 10m
2026-07-24 SWA2535 SJC → SAN Jul 24, 16:15 UTCJul 24, 18:25 UTC2h 10m
2026-07-24 SWA945 SAN → OAK Jul 24, 13:10 UTCJul 24, 15:10 UTC2h 0m
2026-07-24 SWA945 SAN → OAK Jul 24, 13:05 UTCJul 24, 15:07 UTC2h 2m
2026-07-24 SWA1290 BWI → BDL Jul 24, 00:00 UTCJul 24, 01:25 UTC1h 25m
2026-07-23 SWA1290 BWI → BDL Jul 23, 21:15 UTCJul 23, 23:15 UTC2h 0m
2026-07-23 SWA194 DEN → SFO Jul 23, 18:35 UTCJul 23, 20:15 UTC1h 40m
2026-07-23 SWA194 DEN → SFO Jul 23, 16:05 UTCJul 23, 17:25 UTC1h 20m
2026-07-23 SWA2542 HNL → OAK Jul 23, 12:50 UTCJul 23, 14:50 UTC2h 0m
2026-07-23 SWA3514 SNA → SJC Jul 23, 00:50 UTCJul 23, 03:05 UTC2h 15m
2026-07-23 SWA3514 SNA → SJC Jul 23, 00:49 UTCJul 23, 03:05 UTC2h 16m
2026-07-22 SWA3515 LGB → DAL Jul 22, 22:15 UTCJul 22, 23:35 UTC1h 20m
2026-07-22 SWA856 PIT → DAL Jul 22, 19:10 UTCJul 22, 21:00 UTC1h 50m
2026-07-22 SWA1445 LAS → SJC Jul 22, 16:25 UTCJul 22, 17:59 UTC1h 34m
2026-07-22 SWA1445 LAS → SJC Jul 22, 16:30 UTCJul 22, 18:05 UTC1h 35m
2026-07-22 SWA2038 - Jul 22, 13:45 UTCJul 22, 15:00 UTC1h 15m
2026-07-22 SWA578 MDW → LGA Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-22 SWA578 MDW → LGA Jul 22, 05:03 UTCJul 22, 06:10 UTC1h 7m
2026-07-22 SWA2338 SNA → OAK Jul 22, 00:40 UTCJul 22, 04:05 UTC3h 25m
2026-07-22 SWA2338 SNA → OAK Jul 22, 00:37 UTCJul 22, 03:42 UTC3h 5m
2026-07-21 SWA735 SJC → OGG Jul 21, 19:05 UTCJul 21, 22:55 UTC3h 50m
2026-07-21 SWA735 SJC → OGG Jul 21, 15:20 UTCJul 21, 17:25 UTC2h 5m
2026-07-21 SWA735 SJC → OGG Jul 21, 13:25 UTCJul 21, 14:10 UTC45m
2026-07-21 SWA1056 DEN → LGB Jul 21, 06:55 UTCJul 21, 07:40 UTC45m
2026-07-21 SWA548 DEN → AUS Jul 21, 01:35 UTCJul 21, 05:00 UTC3h 25m
2026-07-20 SWA4108 - Jul 20, 23:15 UTCJul 21, 00:20 UTC1h 4m
2026-07-20 SWA4108 - Jul 20, 20:55 UTCJul 20, 22:15 UTC1h 20m
2026-07-20 SWA4868 MCI → FLL Jul 20, 17:10 UTCJul 20, 19:55 UTC2h 45m
2026-07-20 SWA4391 ATL → LGA Jul 20, 12:55 UTCJul 20, 15:40 UTC2h 45m
2026-07-20 SWA1233 SJC → STL Jul 20, 10:40 UTCJul 20, 11:15 UTC35m
2026-07-20 SWA1233 SJC → STL Jul 20, 10:39 UTCJul 20, 11:13 UTC34m
2026-07-20 SWA1311 BWI → ALB Jul 20, 04:25 UTCJul 20, 04:55 UTC30m
2026-07-20 SWA1311 BWI → ALB Jul 20, 02:25 UTCJul 20, 03:05 UTC40m
2026-07-20 SWA1311 BWI → ALB Jul 20, 00:15 UTCJul 20, 01:20 UTC1h 5m
2026-07-19 SWA1311 BWI → ALB Jul 19, 21:40 UTCJul 19, 23:15 UTC1h 35m
2026-07-19 SWA1311 BWI → ALB Jul 19, 19:35 UTCJul 19, 20:45 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 N431WN page for operator, model, and routing details .

Mode-S A528D6 frequently asked

What is Mode-S code A528D6?
A528D6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N431WN.
Where is Mode-S A528D6 registered?
Mode-S code A528D6 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 A528D6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A528D6, octal 51224326, decimal 10,823,894.
What flights does A528D6 operate?
Mode-S A528D6 has broadcast 20 distinct callsigns, including SWA1577, SWA1676, SWA3616, SWA300, SWA2720.