Apparatus

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sensors Mode-S transponder

A2F77B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N290WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A2F77B
Octal
50573573
Decimal
10,680,187
Country
US
Tail
N290WN
Type
B737
No current signal · last broadcast 5h ago
Flights observed
629
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A2F77B.

Country allocation

The ICAO 24-bit address A2F77B 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
SWA3199 Southwest Airlines 9 2026-04-22
SWA169 Southwest Airlines 9 2026-04-18
SWA2673 - 7 2026-07-09
SWA1676 Southwest Airlines 6 2026-05-27
SWA9002 Southwest Airlines 5 2026-05-29
SWA692 - 5 2026-07-01
SWA670 - 5 2026-07-11
SWA487 Southwest Airlines 5 2026-05-17
SWA4128 Southwest Airlines 5 2026-04-30
SWA3828 - 5 2026-07-10
SWA3719 Southwest Airlines 5 2026-05-09
SWA3293 - 5 2026-04-14
SWA1909 Southwest Airlines 5 2026-05-06
SWA1268 - 5 2026-07-03
SWA1095 Southwest Airlines 5 2026-05-25
SWA915 - 4 2026-07-14
SWA4650 Southwest Airlines 4 2026-05-13
SWA2946 Southwest Airlines 4 2026-06-10
SWA1879 Southwest Airlines 4 2026-05-31
SWA1706 Southwest Airlines 4 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA915 - Jul 14, 00:15 UTCJul 14, 01:20 UTC1h 5m
2026-07-14 SWA915 BWI → CLT Jul 14, 00:13 UTCJul 14, 01:14 UTC1h 1m
2026-07-13 SWA4354 ROC → BWI Jul 13, 22:30 UTCJul 13, 23:15 UTC45m
2026-07-13 SWA3789 BWI → ROC Jul 13, 20:35 UTCJul 13, 21:25 UTC50m
2026-07-13 SWA3789 BWI → ROC Jul 13, 20:35 UTCJul 13, 21:24 UTC49m
2026-07-13 SWA3789 MSY → BWI Jul 13, 16:55 UTCJul 13, 19:05 UTC2h 10m
2026-07-13 SWA4692 - Jul 13, 13:40 UTCJul 13, 16:00 UTC2h 20m
2026-07-13 SWA4692 BWI → MSY Jul 13, 13:38 UTCJul 13, 15:56 UTC2h 18m
2026-07-13 SWA4364 ATL → BWI Jul 13, 11:10 UTCJul 13, 12:33 UTC1h 23m
2026-07-12 SWA2529 MCO → ATL Jul 12, 23:35 UTCJul 13, 00:40 UTC1h 5m
2026-07-12 SWA3491 - Jul 12, 19:30 UTCJul 12, 22:05 UTC2h 35m
2026-07-12 SWA3491 SJU → MCO Jul 12, 19:26 UTCJul 12, 21:56 UTC2h 30m
2026-07-12 SWA2531 - Jul 12, 17:55 UTCJul 12, 18:20 UTC25m
2026-07-12 SWA2531 - Jul 12, 13:55 UTCJul 12, 16:10 UTC2h 15m
2026-07-12 SWA1558 DSM → MDW Jul 12, 10:20 UTCJul 12, 11:15 UTC55m
2026-07-12 SWA1558 DSM → MDW Jul 12, 10:20 UTCJul 12, 11:15 UTC55m
2026-07-12 SWA4277 - Jul 12, 03:01 UTCJul 12, 03:45 UTC45m
2026-07-11 SWA2162 - Jul 11, 23:10 UTCJul 12, 02:10 UTC3h 0m
2026-07-11 SWA2162 PHX → MDW Jul 11, 23:10 UTCJul 12, 02:05 UTC2h 56m
2026-07-11 SWA670 - Jul 11, 18:55 UTCJul 11, 22:05 UTC3h 10m
2026-07-11 SWA670 - Jul 11, 16:50 UTCJul 11, 17:35 UTC45m
2026-07-11 SWA670 - Jul 11, 13:45 UTCJul 11, 15:50 UTC2h 5m
2026-07-11 SWA2636 - Jul 11, 10:30 UTCJul 11, 12:20 UTC1h 50m
2026-07-11 SWA2636 MCO → HOU Jul 11, 10:30 UTCJul 11, 12:22 UTC1h 52m
2026-07-11 SWA353 MCO → PIT Jul 11, 03:02 UTCJul 11, 04:54 UTC1h 52m
2026-07-10 SWA353 AUS → MCO Jul 10, 23:45 UTCJul 11, 02:00 UTC2h 15m
2026-07-10 SWA2979 - Jul 10, 21:45 UTCJul 10, 22:55 UTC1h 10m
2026-07-10 SWA2979 MSY → AUS Jul 10, 21:45 UTCJul 10, 22:50 UTC1h 5m
2026-07-10 SWA2052 - Jul 10, 20:05 UTCJul 10, 20:55 UTC50m
2026-07-10 SWA1642 - Jul 10, 17:50 UTCJul 10, 18:35 UTC45m
2026-07-10 SWA1642 DEN → MSY Jul 10, 14:20 UTCJul 10, 16:30 UTC2h 10m
2026-07-10 SWA3737 - Jul 10, 11:40 UTCJul 10, 12:45 UTC1h 5m
2026-07-10 SWA3737 SLC → DEN Jul 10, 11:40 UTCJul 10, 12:44 UTC1h 4m
2026-07-10 SWA3828 SMF → SLC Jul 10, 02:25 UTCJul 10, 03:35 UTC1h 10m
2026-07-10 SWA3828 SMF → SLC Jul 10, 02:23 UTCJul 10, 03:33 UTC1h 10m
2026-07-10 SWA670 - Jul 10, 00:35 UTCJul 10, 01:35 UTC1h 0m
2026-07-09 SWA670 PHX → ONT Jul 9, 23:00 UTCJul 9, 23:45 UTC45m
2026-07-09 SWA4138 LAS → PHX Jul 9, 21:05 UTCJul 9, 21:55 UTC50m
2026-07-09 SWA4138 LAS → PHX Jul 9, 21:04 UTCJul 9, 21:46 UTC42m
2026-07-09 SWA2673 - Jul 9, 16:55 UTCJul 9, 19:20 UTC2h 25m
2026-07-09 SWA2673 OMA → LAS Jul 9, 16:51 UTCJul 9, 19:14 UTC2h 24m
2026-07-09 SWA2673 - Jul 9, 13:20 UTCJul 9, 16:00 UTC2h 40m
2026-07-09 SWA2673 - Jul 9, 10:45 UTCJul 9, 12:20 UTC1h 35m
2026-07-09 SWA345 - Jul 9, 00:30 UTCJul 9, 02:10 UTC1h 40m
2026-07-08 SWA345 - Jul 8, 21:55 UTCJul 8, 23:00 UTC1h 5m
2026-07-08 SWA427 - Jul 8, 20:00 UTCJul 8, 20:55 UTC55m
2026-07-08 SWA427 - Jul 8, 16:50 UTCJul 8, 18:40 UTC1h 50m
2026-07-08 SWA427 - Jul 8, 15:05 UTCJul 8, 15:50 UTC45m
2026-07-08 SWA3026 - Jul 8, 12:50 UTCJul 8, 13:50 UTC1h 0m
2026-07-08 SWA603 - Jul 8, 00:55 UTCJul 8, 01:55 UTC1h 0m

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 N290WN page for operator, model, and routing details .

Mode-S A2F77B frequently asked

What is Mode-S code A2F77B?
A2F77B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N290WN.
Where is Mode-S A2F77B registered?
Mode-S code A2F77B 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 A2F77B broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2F77B, octal 50573573, decimal 10,680,187.
What flights does A2F77B operate?
Mode-S A2F77B has broadcast 20 distinct callsigns, including SWA3199, SWA169, SWA2673, SWA1676, SWA9002.