Apparatus

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sensors Mode-S transponder

A54BAB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N440LV · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A54BAB
Octal
51245653
Decimal
10,832,811
Country
US
Tail
N440LV
Type
B737
No current signal · last broadcast Jul 26, 22:20 UTC
Flights observed
738
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:20 UTC

Last known position

Most recent position reported by Mode-S A54BAB.

Country allocation

The ICAO 24-bit address A54BAB 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
SWA3172 Southwest Airlines 7 2026-05-23
SWA3438 Southwest Airlines 6 2026-06-09
SWA889 Southwest Airlines 5 2026-04-14
SWA3001 - 5 2026-07-06
SWA2594 Southwest Airlines 5 2026-05-13
SWA1757 Southwest Airlines 5 2026-05-24
SWA814 Southwest Airlines 4 2026-06-04
SWA700 Southwest Airlines 4 2026-05-27
SWA4004 - 4 2026-07-11
SWA3736 Southwest Airlines 4 2026-05-29
SWA2973 - 4 2026-07-01
SWA2748 - 4 2026-07-07
SWA2418 - 4 2026-07-11
SWA2328 Southwest Airlines 4 2026-06-07
SWA2233 Southwest Airlines 4 2026-06-04
SWA205 Southwest Airlines 4 2026-05-22
SWA1707 Southwest Airlines 4 2026-04-28
SWA1218 Southwest Airlines 4 2026-05-31
SWA949 - 3 2026-06-18
SWA757 Southwest Airlines 3 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3009 BNA → MYR Jul 26, 20:45 UTCJul 26, 22:20 UTC1h 35m
2026-07-26 SWA256 SFO → DEN Jul 26, 16:15 UTCJul 26, 19:40 UTC3h 25m
2026-07-26 SWA256 SFO → DEN Jul 26, 16:13 UTCJul 26, 19:39 UTC3h 26m
2026-07-26 SWA2538 SJC → SEA Jul 26, 13:40 UTCJul 26, 14:30 UTC50m
2026-07-26 SWA948 AUS → MCO Jul 26, 03:25 UTCJul 26, 04:15 UTC50m
2026-07-26 SWA948 AUS → MCO Jul 26, 03:30 UTCJul 26, 04:10 UTC40m
2026-07-25 SWA1402 LAS → BLI Jul 25, 23:45 UTCJul 26, 02:10 UTC2h 25m
2026-07-25 SWA1230 STL → ATL Jul 25, 21:00 UTCJul 25, 22:50 UTC1h 50m
2026-07-25 SWA1230 STL → ATL Jul 25, 18:50 UTCJul 25, 19:55 UTC1h 5m
2026-07-25 SWA3776 MDW → BDL Jul 25, 16:55 UTCJul 25, 17:35 UTC40m
2026-07-25 SWA2484 BNA → MDW Jul 25, 15:10 UTCJul 25, 15:55 UTC45m
2026-07-25 SWA2031 MCO → OMA Jul 25, 03:20 UTCJul 25, 04:00 UTC40m
2026-07-25 SWA2485 LAX → OAK Jul 25, 01:20 UTCJul 25, 02:05 UTC45m
2026-07-24 SWA2485 LAX → OAK Jul 24, 23:25 UTCJul 25, 00:30 UTC1h 5m
2026-07-24 SWA3870 PBI → ATL Jul 24, 21:30 UTCJul 24, 22:35 UTC1h 5m
2026-07-24 SWA3710 DAL → DCA Jul 24, 19:25 UTCJul 24, 20:25 UTC1h 0m
2026-07-24 SWA439 TPA → MSY Jul 24, 17:30 UTCJul 24, 18:30 UTC1h 0m
2026-07-24 SWA439 TPA → MSY Jul 24, 12:30 UTCJul 24, 15:50 UTC3h 20m
2026-07-24 SWA4390 MDW → TPA Jul 24, 02:05 UTCJul 24, 03:30 UTC1h 25m
2026-07-23 SWA1230 STL → ATL Jul 23, 00:25 UTCJul 23, 03:30 UTC3h 5m
2026-07-22 SWA4129 TPA → BWI Jul 22, 19:50 UTCJul 22, 21:45 UTC1h 55m
2026-07-22 SWA4129 TPA → BWI Jul 22, 19:46 UTCJul 22, 21:44 UTC1h 59m
2026-07-22 SWA1346 MSY → DAL Jul 22, 17:45 UTCJul 22, 18:45 UTC1h 0m
2026-07-22 SWA2051 - Jul 22, 15:50 UTCJul 22, 16:45 UTC55m
2026-07-22 SWA2051 - Jul 22, 12:15 UTCJul 22, 15:00 UTC2h 45m
2026-07-21 SWA954 MSY → LAS Jul 21, 21:35 UTCJul 22, 00:45 UTC3h 10m
2026-07-20 SWA279 SJC → SAN Jul 20, 20:10 UTCJul 20, 22:00 UTC1h 50m
2026-07-20 SWA1371 SNA → OAK Jul 20, 18:25 UTCJul 20, 19:10 UTC45m
2026-07-20 SWA2407 MSY → BNA Jul 20, 15:35 UTCJul 20, 16:50 UTC1h 15m
2026-07-20 SWA594 BWI → BOS Jul 20, 13:35 UTCJul 20, 14:40 UTC1h 5m
2026-07-20 SWA3592 SAV → BNA Jul 20, 10:55 UTCJul 20, 12:00 UTC1h 5m
2026-07-20 SWA3592 SAV → BNA Jul 20, 10:51 UTCJul 20, 11:54 UTC1h 3m
2026-07-20 SWA3838 - Jul 20, 01:25 UTCJul 20, 03:00 UTC1h 35m
2026-07-19 SWA669 BWI → BNA Jul 19, 15:30 UTCJul 19, 17:25 UTC1h 55m
2026-07-19 SWA1106 - Jul 19, 12:40 UTCJul 19, 14:45 UTC2h 5m
2026-07-19 SWA1106 BWI → SRQ Jul 19, 12:36 UTCJul 19, 14:43 UTC2h 7m
2026-07-19 SWA2746 - Jul 19, 02:25 UTCJul 19, 03:45 UTC1h 20m
2026-07-19 SWA1539 BWI → PVD Jul 19, 00:30 UTCJul 19, 00:45 UTC15m
2026-07-19 SWA1539 BWI → PVD Jul 19, 00:28 UTCJul 19, 01:02 UTC34m
2026-07-18 SWA1539 BWI → PVD Jul 18, 22:20 UTCJul 18, 23:45 UTC1h 25m
2026-07-18 SWA2204 LAS → BWI Jul 18, 13:50 UTCJul 18, 18:25 UTC4h 35m
2026-07-18 SWA3745 SLC → LAS Jul 18, 06:15 UTCJul 18, 07:15 UTC1h 0m
2026-07-18 SWA3745 SLC → LAS Jul 18, 06:15 UTCJul 18, 07:14 UTC59m
2026-07-18 SWA4867 - Jul 18, 04:20 UTCJul 18, 05:35 UTC1h 15m
2026-07-18 SWA4461 LAS → PHX Jul 18, 02:29 UTCJul 18, 03:15 UTC46m
2026-07-18 SWA4461 - Jul 18, 00:15 UTCJul 18, 01:15 UTC1h 0m
2026-07-17 SWA4461 - Jul 17, 21:10 UTCJul 17, 22:55 UTC1h 45m
2026-07-17 SWA3495 SAN → DEN Jul 17, 18:11 UTCJul 17, 20:13 UTC2h 3m
2026-07-17 SWA3495 - Jul 17, 18:15 UTCJul 17, 20:10 UTC1h 55m
2026-07-17 SWA4261 SJC → SAN Jul 17, 15:38 UTCJul 17, 16:43 UTC1h 5m

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 N440LV page for operator, model, and routing details .

Mode-S A54BAB frequently asked

What is Mode-S code A54BAB?
A54BAB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N440LV.
Where is Mode-S A54BAB registered?
Mode-S code A54BAB 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 A54BAB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54BAB, octal 51245653, decimal 10,832,811.
What flights does A54BAB operate?
Mode-S A54BAB has broadcast 20 distinct callsigns, including SWA3172, SWA3438, SWA889, SWA3001, SWA2594.