Apparatus

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sensors Mode-S transponder

A1E6B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N221WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A1E6B9
Octal
50363271
Decimal
10,610,361
Country
US
Tail
N221WN
Type
B737
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
636
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A1E6B9.

Country allocation

The ICAO 24-bit address A1E6B9 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
SWA1769 Southwest Airlines 8 2026-06-08
SWA1577 Southwest Airlines 7 2026-06-11
SWA576 Southwest Airlines 6 2026-05-01
SWA3091 Southwest Airlines 5 2026-04-23
SWA849 - 4 2026-06-28
SWA4600 Southwest Airlines 4 2026-04-23
SWA4237 Southwest Airlines 4 2026-05-17
SWA3871 Southwest Airlines 4 2026-06-11
SWA3144 Southwest Airlines 4 2026-05-09
SWA2986 Southwest Airlines 4 2026-07-25
SWA2394 - 4 2026-07-17
SWA1826 Southwest Airlines 4 2026-06-11
SWA1519 Southwest Airlines 4 2026-06-13
SWA1401 - 4 2026-07-19
SWA1396 Southwest Airlines 4 2026-05-04
SWA859 - 3 2026-06-24
SWA835 Southwest Airlines 3 2026-06-12
SWA736 - 3 2026-06-15
SWA717 Southwest Airlines 3 2026-06-07
SWA621 Southwest Airlines 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3995 MCO → PHL Jul 26, 18:15 UTCJul 26, 21:00 UTC2h 45m
2026-07-26 SWA1513 SJC → LAX Jul 26, 13:10 UTCJul 26, 17:15 UTC4h 5m
2026-07-26 SWA1513 SJC → LAX Jul 26, 13:06 UTCJul 26, 17:22 UTC4h 16m
2026-07-26 SWA4417 MDW → BOS Jul 26, 10:25 UTCJul 26, 11:20 UTC55m
2026-07-26 SWA4164 PHX → LGB Jul 26, 02:30 UTCJul 26, 03:05 UTC35m
2026-07-26 SWA4164 PHX → LGB Jul 26, 02:25 UTCJul 26, 03:01 UTC36m
2026-07-25 SWA2986 BUR → OAK Jul 25, 22:05 UTCJul 26, 00:15 UTC2h 10m
2026-07-25 SWA2986 BUR → OAK Jul 25, 22:00 UTCJul 26, 00:12 UTC2h 12m
2026-07-25 SWA4038 AUS → SAN Jul 25, 20:05 UTCJul 25, 21:10 UTC1h 5m
2026-07-25 SWA3172 PHX → MSP Jul 25, 16:15 UTCJul 25, 19:05 UTC2h 50m
2026-07-25 SWA4181 OAK → PHX Jul 25, 12:15 UTCJul 25, 14:15 UTC2h 0m
2026-07-25 SWA4181 OAK → PHX Jul 25, 12:15 UTCJul 25, 14:55 UTC2h 40m
2026-07-25 SWA4929 BWI → LAX Jul 25, 09:10 UTCJul 25, 11:00 UTC1h 50m
2026-07-25 SWA4993 LAS → DCA Jul 25, 01:15 UTCJul 25, 03:35 UTC2h 20m
2026-07-25 SWA4993 LAS → DCA Jul 25, 01:10 UTCJul 25, 03:32 UTC2h 22m
2026-07-24 SWA285 BWI → ALB Jul 24, 22:22 UTCJul 25, 00:14 UTC1h 52m
2026-07-24 SWA285 BWI → ALB Jul 24, 18:50 UTCJul 24, 21:10 UTC2h 20m
2026-07-24 SWA285 BWI → ALB Jul 24, 16:30 UTCJul 24, 17:55 UTC1h 25m
2026-07-24 SWA1057 BUR → SLC Jul 24, 14:25 UTCJul 24, 15:35 UTC1h 10m
2026-07-24 SWA4303 SMF → BNA Jul 24, 04:50 UTCJul 24, 07:10 UTC2h 20m
2026-07-24 SWA4639 TPA → AUS Jul 24, 01:10 UTCJul 24, 03:45 UTC2h 35m
2026-07-24 SWA4639 TPA → AUS Jul 24, 01:08 UTCJul 24, 03:39 UTC2h 32m
2026-07-23 SWA777 PHL → STL Jul 23, 22:20 UTCJul 24, 00:05 UTC1h 45m
2026-07-23 SWA777 PHL → STL Jul 23, 20:00 UTCJul 23, 21:05 UTC1h 5m
2026-07-23 SWA668 - Jul 23, 16:45 UTCJul 23, 18:20 UTC1h 35m
2026-07-23 SWA484 BWI → BDL Jul 23, 13:15 UTCJul 23, 15:45 UTC2h 30m
2026-07-23 SWA335 LAX → SJC Jul 23, 09:35 UTCJul 23, 12:10 UTC2h 35m
2026-07-22 SWA9003 PHX → DEN Jul 22, 17:50 UTCJul 22, 18:30 UTC40m
2026-07-22 SWA9003 PHX → DEN Jul 22, 17:46 UTCJul 22, 18:34 UTC48m
2026-07-22 SWA758 - Jul 22, 15:10 UTCJul 22, 16:10 UTC1h 0m
2026-07-22 SWA758 - Jul 22, 13:20 UTCJul 22, 14:25 UTC1h 5m
2026-07-22 SWA297 SJC → BUR Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-22 SWA297 SJC → BUR Jul 22, 10:33 UTCJul 22, 11:43 UTC1h 11m
2026-07-22 SWA4745 MDW → PVD Jul 22, 01:30 UTCJul 22, 02:40 UTC1h 10m
2026-07-21 SWA4781 - Jul 21, 21:15 UTCJul 21, 22:50 UTC1h 35m
2026-07-21 SWA4533 - Jul 21, 18:30 UTCJul 21, 20:05 UTC1h 35m
2026-07-21 SWA2833 - Jul 21, 15:25 UTCJul 21, 17:35 UTC2h 10m
2026-07-21 SWA2309 ONT → SJC Jul 21, 13:00 UTCJul 21, 13:50 UTC50m
2026-07-21 SWA1324 SMF → LAS Jul 21, 03:35 UTCJul 21, 04:40 UTC1h 5m
2026-07-21 SWA1324 SMF → LAS Jul 21, 03:34 UTCJul 21, 04:39 UTC1h 5m
2026-07-21 SWA4500 BWI → PBI Jul 21, 01:55 UTCJul 21, 02:55 UTC1h 0m
2026-07-21 SWA4500 BWI → PBI Jul 21, 01:50 UTCJul 21, 02:48 UTC58m
2026-07-21 SWA4500 BWI → PBI Jul 21, 00:10 UTCJul 21, 00:50 UTC40m
2026-07-20 SWA714 RDU → MDW Jul 20, 21:20 UTCJul 20, 22:30 UTC1h 10m
2026-07-20 SWA714 RDU → MDW Jul 20, 18:55 UTCJul 20, 20:25 UTC1h 30m
2026-07-20 SWA4601 SNA → SMF Jul 20, 15:55 UTCJul 20, 17:30 UTC1h 35m
2026-07-20 SWA1884 BWI → LAS Jul 20, 12:40 UTCJul 20, 14:50 UTC2h 10m
2026-07-20 SWA4440 DEN → GEG Jul 20, 03:50 UTCJul 20, 05:50 UTC2h 0m
2026-07-20 SWA4024 ORD → PHX Jul 20, 00:45 UTCJul 20, 02:35 UTC1h 50m
2026-07-19 SWA4533 - Jul 19, 22:40 UTCJul 19, 23:40 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 N221WN page for operator, model, and routing details .

Mode-S A1E6B9 frequently asked

What is Mode-S code A1E6B9?
A1E6B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N221WN.
Where is Mode-S A1E6B9 registered?
Mode-S code A1E6B9 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 A1E6B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1E6B9, octal 50363271, decimal 10,610,361.
What flights does A1E6B9 operate?
Mode-S A1E6B9 has broadcast 20 distinct callsigns, including SWA1769, SWA1577, SWA576, SWA3091, SWA849.