Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A56A56

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N448WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A56A56
Octal
51265126
Decimal
10,840,662
Country
US
Tail
N448WN
Type
B737
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
759
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A56A56.

Country allocation

The ICAO 24-bit address A56A56 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
SWA1219 Southwest Airlines 6 2026-05-01
SWA482 - 5 2026-07-15
SWA9002 Southwest Airlines 4 2026-05-21
SWA3643 Southwest Airlines 4 2026-05-15
SWA3546 Southwest Airlines 4 2026-04-29
SWA3489 - 4 2026-04-13
SWA2741 - 4 2026-07-11
SWA2660 Southwest Airlines 4 2026-04-18
SWA2536 Southwest Airlines 4 2026-05-26
SWA2414 Southwest Airlines 4 2026-07-21
SWA2324 Southwest Airlines 4 2026-05-22
SWA2318 - 4 2026-07-18
SWA1914 Southwest Airlines 4 2026-04-29
SWA170 Southwest Airlines 4 2026-06-27
SWA1654 Southwest Airlines 4 2026-04-27
SWA1586 - 4 2026-07-22
SWA1563 - 4 2026-07-10
SWA138 Southwest Airlines 4 2026-06-09
SWA1311 - 4 2026-04-13
SWA121 Southwest Airlines 4 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA418 SJC → LAS Jul 26, 21:15 UTCJul 26, 21:30 UTC15m
2026-07-26 SWA4742 IND → BNA Jul 26, 18:20 UTCJul 26, 20:05 UTC1h 45m
2026-07-26 SWA4319 HRL → DAL Jul 26, 16:20 UTCJul 26, 17:20 UTC1h 0m
2026-07-26 SWA4319 HRL → DAL Jul 26, 16:19 UTCJul 26, 17:23 UTC1h 4m
2026-07-26 SWA4319 HRL → DAL Jul 26, 13:20 UTCJul 26, 15:10 UTC1h 50m
2026-07-26 SWA4210 MSY → DEN Jul 26, 00:36 UTCJul 26, 03:43 UTC3h 7m
2026-07-26 SWA4210 MSY → DEN Jul 26, 00:40 UTCJul 26, 03:45 UTC3h 5m
2026-07-25 SWA3863 ISP → TPA Jul 25, 22:35 UTCJul 25, 23:25 UTC50m
2026-07-25 SWA4502 MCI → PNS Jul 25, 20:50 UTCJul 25, 21:31 UTC41m
2026-07-25 SWA4502 MCI → PNS Jul 25, 20:55 UTCJul 25, 21:30 UTC35m
2026-07-25 SWA4025 IND → LAS Jul 25, 18:50 UTCJul 25, 19:35 UTC45m
2026-07-25 SWA362 BOI → SJC Jul 25, 15:30 UTCJul 25, 16:30 UTC1h 0m
2026-07-25 SWA2430 - Jul 25, 13:40 UTCJul 25, 14:25 UTC45m
2026-07-25 SWA3648 SJC → SEA Jul 25, 05:45 UTCJul 25, 06:41 UTC56m
2026-07-25 SWA4330 SAN → OAK Jul 25, 02:30 UTCJul 25, 04:50 UTC2h 20m
2026-07-24 SWA1382 LGA → MDW Jul 24, 23:25 UTCJul 25, 01:15 UTC1h 50m
2026-07-24 SWA380 LAX → LAS Jul 24, 20:20 UTCJul 24, 21:40 UTC1h 20m
2026-07-24 SWA380 LAX → LAS Jul 24, 18:10 UTCJul 24, 18:50 UTC40m
2026-07-24 SWA380 LAX → LAS Jul 24, 15:10 UTCJul 24, 17:20 UTC2h 10m
2026-07-24 SWA617 BOI → PHX Jul 24, 13:10 UTCJul 24, 13:45 UTC35m
2026-07-23 SWA616 LAS → SFO Jul 23, 21:20 UTCJul 23, 22:00 UTC40m
2026-07-23 SWA913 LAS → SJC Jul 23, 18:40 UTCJul 23, 19:40 UTC1h 0m
2026-07-23 SWA912 MDW → BOS Jul 23, 15:30 UTCJul 23, 16:15 UTC45m
2026-07-23 SWA912 MDW → BOS Jul 23, 15:25 UTCJul 23, 16:45 UTC1h 20m
2026-07-23 SWA3011 DAL → SAT Jul 23, 12:30 UTCJul 23, 13:55 UTC1h 25m
2026-07-23 SWA4038 AUS → SAN Jul 23, 00:55 UTCJul 23, 02:10 UTC1h 15m
2026-07-22 SWA2074 OAK → BUR Jul 22, 21:30 UTCJul 22, 23:45 UTC2h 15m
2026-07-22 SWA2074 OAK → BUR Jul 22, 21:28 UTCJul 22, 23:42 UTC2h 14m
2026-07-22 SWA2552 BOS → MDW Jul 22, 18:55 UTCJul 22, 20:30 UTC1h 35m
2026-07-22 SWA1586 - Jul 22, 16:50 UTCJul 22, 18:00 UTC1h 10m
2026-07-22 SWA4125 SBA → DEN Jul 22, 13:30 UTCJul 22, 15:30 UTC2h 0m
2026-07-22 SWA3842 DEN → SBA Jul 22, 03:30 UTCJul 22, 05:25 UTC1h 55m
2026-07-22 SWA3842 - Jul 22, 03:35 UTCJul 22, 05:25 UTC1h 50m
2026-07-21 SWA2511 - Jul 21, 23:35 UTCJul 22, 01:50 UTC2h 15m
2026-07-21 SWA120 MCI → BWI Jul 21, 20:45 UTCJul 21, 22:45 UTC2h 0m
2026-07-21 SWA120 MCI → BWI Jul 21, 18:50 UTCJul 21, 19:40 UTC50m
2026-07-21 SWA120 MCI → BWI Jul 21, 16:15 UTCJul 21, 17:40 UTC1h 25m
2026-07-21 SWA120 MCI → BWI Jul 21, 13:45 UTCJul 21, 14:55 UTC1h 10m
2026-07-21 SWA3551 LAS → DEN Jul 21, 05:40 UTCJul 21, 06:45 UTC1h 5m
2026-07-21 SWA3551 LAS → DEN Jul 21, 03:40 UTCJul 21, 04:30 UTC50m
2026-07-21 SWA2414 LAS → SJC Jul 21, 00:40 UTCJul 21, 01:40 UTC1h 0m
2026-07-21 SWA2414 LAS → SJC Jul 21, 00:38 UTCJul 21, 01:46 UTC1h 8m
2026-07-20 SWA2414 LAS → SJC Jul 20, 22:35 UTCJul 20, 23:15 UTC40m
2026-07-20 SWA2414 LAS → SJC Jul 20, 20:10 UTCJul 20, 21:20 UTC1h 10m
2026-07-20 SWA1740 MHT → MDW Jul 20, 16:40 UTCJul 20, 18:35 UTC1h 55m
2026-07-20 SWA1740 MHT → MDW Jul 20, 16:36 UTCJul 20, 18:30 UTC1h 54m
2026-07-20 SWA1828 EUG → DEN Jul 20, 13:20 UTCJul 20, 15:25 UTC2h 5m
2026-07-20 SWA636 SMF → EUG Jul 20, 05:25 UTCJul 20, 06:15 UTC50m
2026-07-20 SWA2366 SJC → BUR Jul 20, 03:30 UTCJul 20, 04:30 UTC1h 0m
2026-07-20 SWA2366 SJC → BUR Jul 20, 01:50 UTCJul 20, 02:30 UTC40m

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 N448WN page for operator, model, and routing details .

Mode-S A56A56 frequently asked

What is Mode-S code A56A56?
A56A56 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N448WN.
Where is Mode-S A56A56 registered?
Mode-S code A56A56 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 A56A56 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A56A56, octal 51265126, decimal 10,840,662.
What flights does A56A56 operate?
Mode-S A56A56 has broadcast 20 distinct callsigns, including SWA1219, SWA482, SWA9002, SWA3643, SWA3546.