Apparatus

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sensors Mode-S transponder

ACBA1B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N919WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
ACBA1B
Octal
53135033
Decimal
11,319,835
Country
US
Tail
N919WN
Type
B737
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
735
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S ACBA1B.

Country allocation

The ICAO 24-bit address ACBA1B 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
SWA3791 Southwest Airlines 10 2026-05-26
SWA3023 - 6 2026-07-10
SWA1157 Southwest Airlines 6 2026-05-14
SWA4355 Southwest Airlines 5 2026-07-18
SWA3743 - 5 2026-07-10
SWA2921 Southwest Airlines 5 2026-07-24
SWA1283 Southwest Airlines 5 2026-04-17
SWA1275 - 5 2026-06-15
SWA1031 - 5 2026-07-09
SWA10 Southwest Airlines 5 2026-07-22
SWA937 Southwest Airlines 4 2026-06-09
SWA644 - 4 2026-06-21
SWA4189 - 4 2026-07-20
SWA3877 - 4 2026-07-15
SWA3589 Southwest Airlines 4 2026-04-18
SWA3419 Southwest Airlines 4 2026-05-01
SWA3323 Southwest Airlines 4 2026-04-25
SWA3144 Southwest Airlines 4 2026-05-19
SWA2869 - 4 2026-07-10
SWA2602 Southwest Airlines 4 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3608 ALB → TPA Jul 26, 19:30 UTCJul 26, 21:45 UTC2h 15m
2026-07-26 SWA3608 ALB → TPA Jul 26, 15:45 UTCJul 26, 18:30 UTC2h 45m
2026-07-26 SWA3011 DAL → SAT Jul 26, 13:15 UTCJul 26, 14:37 UTC1h 23m
2026-07-26 SWA3011 DAL → SAT Jul 26, 13:15 UTCJul 26, 14:40 UTC1h 25m
2026-07-26 SWA4756 BNA → MSY Jul 26, 02:45 UTCJul 26, 03:20 UTC35m
2026-07-26 SWA4756 BNA → MSY Jul 26, 02:35 UTCJul 26, 03:20 UTC45m
2026-07-25 SWA41 HOU → MSY Jul 25, 21:55 UTCJul 25, 22:35 UTC40m
2026-07-25 SWA41 HOU → MSY Jul 25, 19:05 UTCJul 25, 20:45 UTC1h 40m
2026-07-25 SWA41 HOU → MSY Jul 25, 16:30 UTCJul 25, 17:50 UTC1h 20m
2026-07-25 SWA3986 BOS → BWI Jul 25, 13:40 UTCJul 25, 15:35 UTC1h 55m
2026-07-25 SWA1783 BOS → BWI Jul 25, 11:15 UTCJul 25, 12:40 UTC1h 25m
2026-07-25 SWA4822 HOU → LAS Jul 25, 01:15 UTCJul 25, 02:20 UTC1h 5m
2026-07-24 SWA2921 BWI → BOS Jul 24, 23:05 UTCJul 25, 00:25 UTC1h 20m
2026-07-24 SWA2921 BWI → BOS Jul 24, 23:03 UTCJul 25, 00:20 UTC1h 17m
2026-07-24 SWA2921 BWI → BOS Jul 24, 19:10 UTCJul 24, 22:15 UTC3h 5m
2026-07-24 SWA2079 LAS → OAK Jul 24, 17:15 UTCJul 24, 18:05 UTC50m
2026-07-24 SWA2079 LAS → OAK Jul 24, 12:55 UTCJul 24, 16:15 UTC3h 20m
2026-07-24 SWA1861 MDW → MSP Jul 24, 09:25 UTCJul 24, 11:25 UTC2h 0m
2026-07-24 SWA1459 SFO → BUR Jul 24, 01:45 UTCJul 24, 02:20 UTC35m
2026-07-23 SWA164 PDX → OAK Jul 23, 23:00 UTCJul 24, 00:55 UTC1h 55m
2026-07-23 SWA164 PDX → OAK Jul 23, 20:05 UTCJul 23, 21:50 UTC1h 45m
2026-07-23 SWA164 PDX → OAK Jul 23, 18:05 UTCJul 23, 18:50 UTC45m
2026-07-23 SWA3594 OAK → LAS Jul 23, 15:35 UTCJul 23, 17:15 UTC1h 40m
2026-07-23 SWA1093 SJC → SNA Jul 23, 13:10 UTCJul 23, 14:40 UTC1h 30m
2026-07-23 SWA3422 BUR → OAK Jul 23, 10:45 UTCJul 23, 11:25 UTC40m
2026-07-23 SWA2690 PHL → BNA Jul 23, 00:45 UTCJul 23, 02:15 UTC1h 30m
2026-07-22 SWA2627 SNA → SLC Jul 22, 21:35 UTCJul 22, 23:45 UTC2h 10m
2026-07-22 SWA2627 SNA → SLC Jul 22, 21:32 UTCJul 22, 23:44 UTC2h 12m
2026-07-22 SWA2729 BWI → BUF Jul 22, 18:11 UTCJul 22, 20:00 UTC1h 49m
2026-07-22 SWA2729 BWI → BUF Jul 22, 18:15 UTCJul 22, 20:10 UTC1h 55m
2026-07-22 SWA10 MCI → TPA Jul 22, 15:45 UTCJul 22, 16:45 UTC1h 0m
2026-07-22 SWA10 MCI → TPA Jul 22, 15:40 UTCJul 22, 17:10 UTC1h 30m
2026-07-22 SWA10 MCI → TPA Jul 22, 13:50 UTCJul 22, 14:30 UTC40m
2026-07-22 SWA2040 SAN → SJC Jul 22, 01:05 UTCJul 22, 01:45 UTC40m
2026-07-21 SWA2040 SAN → SJC Jul 21, 23:20 UTCJul 21, 23:55 UTC35m
2026-07-21 SWA4301 HOU → OAK Jul 21, 21:00 UTCJul 21, 21:50 UTC50m
2026-07-21 SWA4301 HOU → OAK Jul 21, 17:15 UTCJul 21, 19:45 UTC2h 30m
2026-07-21 SWA1635 SAN → SJC Jul 21, 13:20 UTCJul 21, 16:10 UTC2h 50m
2026-07-21 SWA4964 MKE → MCO Jul 21, 02:10 UTCJul 21, 04:06 UTC1h 56m
2026-07-21 SWA4964 MKE → MCO Jul 21, 02:15 UTCJul 21, 04:15 UTC2h 0m
2026-07-20 SWA3355 CMH → MDW Jul 20, 21:05 UTCJul 21, 01:05 UTC3h 59m
2026-07-20 SWA3355 CMH → MDW Jul 20, 21:04 UTCJul 21, 01:00 UTC3h 56m
2026-07-20 SWA4189 - Jul 20, 16:55 UTCJul 20, 20:00 UTC3h 5m
2026-07-20 SWA3239 LGB → LAS Jul 20, 10:17 UTCJul 20, 12:21 UTC2h 5m
2026-07-20 SWA3239 LGB → LAS Jul 20, 10:20 UTCJul 20, 12:25 UTC2h 5m
2026-07-19 SWA1107 DEN → BOS Jul 19, 01:20 UTCJul 19, 04:40 UTC3h 20m
2026-07-18 SWA3912 SAN → OAK Jul 18, 22:35 UTCJul 19, 00:15 UTC1h 40m
2026-07-18 SWA3418 ORF → STL Jul 18, 18:35 UTCJul 18, 20:35 UTC2h 0m
2026-07-18 SWA3418 ORF → STL Jul 18, 18:35 UTCJul 18, 20:23 UTC1h 48m
2026-07-18 SWA2791 OAK → BUR Jul 18, 15:10 UTCJul 18, 17:25 UTC2h 15m

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 N919WN page for operator, model, and routing details .

Mode-S ACBA1B frequently asked

What is Mode-S code ACBA1B?
ACBA1B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N919WN.
Where is Mode-S ACBA1B registered?
Mode-S code ACBA1B 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 ACBA1B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACBA1B, octal 53135033, decimal 11,319,835.
What flights does ACBA1B operate?
Mode-S ACBA1B has broadcast 20 distinct callsigns, including SWA3791, SWA3023, SWA1157, SWA4355, SWA3743.