Apparatus

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sensors Mode-S transponder

A1B1BC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N208WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A1B1BC
Octal
50330674
Decimal
10,596,796
Country
US
Tail
N208WN
Type
B737
No current signal · last broadcast Jul 26, 22:40 UTC
Flights observed
765
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:40 UTC

Last known position

Most recent position reported by Mode-S A1B1BC.

Country allocation

The ICAO 24-bit address A1B1BC 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
SWA1149 Southwest Airlines 12 2026-06-03
SWA3624 - 10 2026-07-07
SWA845 - 8 2026-07-14
SWA2444 Southwest Airlines 7 2026-05-21
SWA3810 Southwest Airlines 5 2026-05-24
SWA371 - 5 2026-06-25
SWA2116 - 5 2026-07-02
SWA130 - 5 2026-07-20
SWA1276 Southwest Airlines 5 2026-07-23
SWA553 - 4 2026-07-18
SWA4506 Southwest Airlines 4 2026-07-20
SWA4318 - 4 2026-06-18
SWA4155 Southwest Airlines 4 2026-05-31
SWA369 Southwest Airlines 4 2026-05-28
SWA3245 Southwest Airlines 4 2026-04-15
SWA297 Southwest Airlines 4 2026-07-20
SWA295 - 4 2026-07-17
SWA25 - 4 2026-07-15
SWA2201 - 4 2026-07-10
SWA2079 - 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA878 SAN → SFO Jul 26, 20:55 UTCJul 26, 22:35 UTC1h 40m
2026-07-26 SWA4208 DEN → PHX Jul 26, 18:55 UTCJul 26, 19:45 UTC50m
2026-07-26 SWA4549 MDW → CHS Jul 26, 16:53 UTCJul 26, 17:45 UTC52m
2026-07-26 SWA4549 MDW → CHS Jul 26, 16:55 UTCJul 26, 17:55 UTC1h 0m
2026-07-26 SWA3450 MSY → DEN Jul 26, 12:10 UTCJul 26, 13:30 UTC1h 20m
2026-07-26 SWA843 OAK → BUR Jul 26, 02:15 UTCJul 26, 03:00 UTC45m
2026-07-26 SWA717 RNO → LGB Jul 26, 00:25 UTCJul 26, 01:25 UTC1h 0m
2026-07-25 SWA717 RNO → LGB Jul 25, 22:30 UTCJul 25, 23:35 UTC1h 5m
2026-07-25 SWA836 PHX → SJC Jul 25, 20:20 UTCJul 25, 21:30 UTC1h 10m
2026-07-25 SWA836 PHX → SJC Jul 25, 18:30 UTCJul 25, 19:15 UTC45m
2026-07-25 SWA3635 ABQ → SAN Jul 25, 16:35 UTCJul 25, 17:25 UTC50m
2026-07-25 SWA2165 SJC → PDX Jul 25, 14:45 UTCJul 25, 15:40 UTC55m
2026-07-25 SWA1890 SAN → SMF Jul 25, 03:25 UTCJul 25, 04:20 UTC55m
2026-07-25 SWA1890 SAN → SMF Jul 25, 01:05 UTCJul 25, 02:40 UTC1h 35m
2026-07-24 SWA804 BWI → ALB Jul 24, 22:45 UTCJul 25, 00:10 UTC1h 25m
2026-07-24 SWA804 BWI → ALB Jul 24, 20:10 UTCJul 24, 20:55 UTC45m
2026-07-24 SWA2741 MCO → IND Jul 24, 15:15 UTCJul 24, 19:00 UTC3h 45m
2026-07-24 SWA3460 LGB → OAK Jul 24, 12:30 UTCJul 24, 13:50 UTC1h 20m
2026-07-24 SWA2878 PHL → MCO Jul 24, 00:05 UTCJul 24, 01:15 UTC1h 10m
2026-07-23 SWA1276 SAN → SJC Jul 23, 21:15 UTCJul 23, 22:35 UTC1h 20m
2026-07-23 SWA1276 SAN → SJC Jul 23, 21:10 UTCJul 23, 22:32 UTC1h 22m
2026-07-23 SWA1276 SAN → SJC Jul 23, 18:10 UTCJul 23, 20:10 UTC2h 0m
2026-07-23 SWA1276 SAN → SJC Jul 23, 15:50 UTCJul 23, 16:40 UTC50m
2026-07-23 SWA2319 DEN → AUS Jul 23, 13:40 UTCJul 23, 14:25 UTC45m
2026-07-23 SWA2758 DEN → LAS Jul 23, 01:30 UTCJul 23, 03:40 UTC2h 10m
2026-07-23 SWA2758 DEN → LAS Jul 23, 01:24 UTCJul 23, 03:41 UTC2h 17m
2026-07-22 SWA2758 DEN → LAS Jul 22, 23:45 UTCJul 23, 00:25 UTC40m
2026-07-22 SWA194 DEN → SFO Jul 22, 20:10 UTCJul 22, 21:55 UTC1h 45m
2026-07-22 SWA1429 BHM → MDW Jul 22, 17:55 UTCJul 22, 19:00 UTC1h 5m
2026-07-22 SWA1429 BHM → MDW Jul 22, 17:50 UTCJul 22, 18:59 UTC1h 9m
2026-07-22 SWA1429 BHM → MDW Jul 22, 16:00 UTCJul 22, 16:50 UTC50m
2026-07-22 SWA866 PWM → BWI Jul 22, 13:30 UTCJul 22, 14:55 UTC1h 25m
2026-07-21 SWA873 SAN → SFO Jul 21, 23:15 UTCJul 21, 23:50 UTC35m
2026-07-21 SWA2375 LAS → TUS Jul 21, 19:45 UTCJul 21, 22:10 UTC2h 25m
2026-07-21 SWA2109 MDW → MIA Jul 21, 16:30 UTCJul 21, 18:30 UTC2h 0m
2026-07-21 SWA4531 AUS → ELP Jul 21, 13:25 UTCJul 21, 15:10 UTC1h 45m
2026-07-21 SWA1396 PVD → BWI Jul 21, 10:55 UTCJul 21, 12:15 UTC1h 20m
2026-07-21 SWA2905 - Jul 21, 02:55 UTCJul 21, 03:40 UTC45m
2026-07-21 SWA1163 BUR → LAS Jul 21, 00:25 UTCJul 21, 01:15 UTC50m
2026-07-20 SWA4506 DAL → MDW Jul 20, 22:55 UTCJul 20, 23:40 UTC45m
2026-07-20 SWA4506 DAL → MDW Jul 20, 18:50 UTCJul 20, 21:55 UTC3h 5m
2026-07-20 SWA130 ABQ → LAS Jul 20, 14:30 UTCJul 20, 15:35 UTC1h 5m
2026-07-20 SWA297 SJC → BUR Jul 20, 05:55 UTCJul 20, 07:10 UTC1h 15m
2026-07-20 SWA297 SJC → BUR Jul 20, 03:10 UTCJul 20, 03:15 UTC5m
2026-07-20 SWA297 SJC → BUR Jul 20, 01:15 UTCJul 20, 02:50 UTC1h 35m
2026-07-19 SWA297 SJC → BUR Jul 19, 23:15 UTCJul 20, 00:10 UTC55m
2026-07-19 SWA2156 - Jul 19, 20:40 UTCJul 19, 22:05 UTC1h 25m
2026-07-19 SWA541 - Jul 19, 18:05 UTCJul 19, 19:00 UTC55m
2026-07-19 SWA541 BNA → JAX Jul 19, 18:01 UTCJul 19, 19:12 UTC1h 11m
2026-07-19 SWA1730 - Jul 19, 15:45 UTCJul 19, 16:55 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 N208WN page for operator, model, and routing details .

Mode-S A1B1BC frequently asked

What is Mode-S code A1B1BC?
A1B1BC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N208WN.
Where is Mode-S A1B1BC registered?
Mode-S code A1B1BC 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 A1B1BC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B1BC, octal 50330674, decimal 10,596,796.
What flights does A1B1BC operate?
Mode-S A1B1BC has broadcast 20 distinct callsigns, including SWA1149, SWA3624, SWA845, SWA2444, SWA3810.