Apparatus

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sensors Mode-S transponder

ABAA43

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8504G · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABAA43
Octal
52725103
Decimal
11,250,243
Country
US
Tail
N8504G
Type
B738
No current signal · last broadcast Jul 16, 14:05 UTC
Flights observed
640
Distinct callsigns
20
Country
US
Last broadcast
Jul 16, 14:05 UTC

Last known position

Most recent position reported by Mode-S ABAA43.

Country allocation

The ICAO 24-bit address ABAA43 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
SWA4112 Southwest Airlines 4 2026-05-28
SWA4076 Southwest Airlines 4 2026-05-18
SWA3402 Southwest Airlines 4 2026-05-15
SWA2971 Southwest Airlines 4 2026-05-22
SWA273 Southwest Airlines 4 2026-06-12
SWA2402 - 4 2026-07-06
SWA185 Southwest Airlines 4 2026-07-08
SWA752 Southwest Airlines 3 2026-05-23
SWA7 - 3 2026-07-07
SWA485 - 3 2026-06-29
SWA450 - 3 2026-07-11
SWA4420 Southwest Airlines 3 2026-05-23
SWA4279 Southwest Airlines 3 2026-05-23
SWA4220 - 3 2026-07-15
SWA4074 Southwest Airlines 3 2026-06-17
SWA3839 Southwest Airlines 3 2026-06-13
SWA3394 Southwest Airlines 3 2026-04-26
SWA3218 - 3 2026-06-17
SWA2939 Southwest Airlines 3 2026-06-04
SWA2861 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 SWA8501 DEN → PAE Jul 16, 11:40 UTCJul 16, 14:05 UTC2h 25m
2026-07-16 SWA8501 DEN → PAE Jul 16, 11:39 UTCJul 16, 13:55 UTC2h 16m
2026-07-16 SWA3677 DAL → DEN Jul 16, 00:55 UTCJul 16, 02:25 UTC1h 30m
2026-07-15 SWA4489 - Jul 15, 21:20 UTCJul 15, 22:45 UTC1h 25m
2026-07-15 SWA4489 LAS → DAL Jul 15, 21:16 UTCJul 15, 23:46 UTC2h 30m
2026-07-15 SWA1771 - Jul 15, 17:15 UTCJul 15, 19:45 UTC2h 30m
2026-07-15 SWA1771 DSM → LAS Jul 15, 17:11 UTCJul 15, 19:34 UTC2h 24m
2026-07-15 SWA1771 - Jul 15, 15:35 UTCJul 15, 16:20 UTC45m
2026-07-15 SWA4068 - Jul 15, 12:25 UTCJul 15, 14:00 UTC1h 35m
2026-07-15 SWA4220 - Jul 15, 00:00 UTCJul 15, 00:50 UTC50m
2026-07-14 SWA4220 - Jul 14, 22:25 UTCJul 14, 23:00 UTC34m
2026-07-14 SWA4220 - Jul 14, 20:25 UTCJul 14, 22:20 UTC1h 55m
2026-07-14 SWA875 PHX → DAL Jul 14, 17:10 UTCJul 14, 19:20 UTC2h 10m
2026-07-14 SWA875 SEA → PHX Jul 14, 13:25 UTCJul 14, 16:05 UTC2h 40m
2026-07-14 SWA4985 SMF → SEA Jul 14, 04:55 UTCJul 14, 06:10 UTC1h 15m
2026-07-14 SWA4985 SMF → SEA Jul 14, 04:54 UTCJul 14, 06:07 UTC1h 13m
2026-07-14 SWA3603 SBA → SMF Jul 14, 02:52 UTCJul 14, 03:44 UTC52m
2026-07-14 SWA3603 SBA → SMF Jul 14, 02:55 UTCJul 14, 03:50 UTC55m
2026-07-14 SWA590 OAK → SBA Jul 14, 01:05 UTCJul 14, 01:55 UTC50m
2026-07-14 SWA590 - Jul 14, 01:05 UTCJul 14, 01:51 UTC46m
2026-07-13 SWA3155 - Jul 13, 23:05 UTCJul 13, 23:55 UTC50m
2026-07-13 SWA3155 ONT → OAK Jul 13, 23:03 UTCJul 13, 23:50 UTC47m
2026-07-13 SWA3807 SMF → ONT Jul 13, 20:58 UTCJul 13, 22:06 UTC1h 8m
2026-07-13 SWA3807 SMF → ONT Jul 13, 21:00 UTCJul 13, 22:00 UTC1h 0m
2026-07-13 SWA3167 - Jul 13, 19:05 UTCJul 13, 20:00 UTC55m
2026-07-13 SWA3167 ONT → SMF Jul 13, 19:01 UTCJul 13, 19:58 UTC57m
2026-07-13 SWA431 PHX → ONT Jul 13, 17:15 UTCJul 13, 18:00 UTC45m
2026-07-13 SWA431 DEN → PHX Jul 13, 14:55 UTCJul 13, 16:15 UTC1h 20m
2026-07-13 SWA2546 - Jul 13, 12:15 UTCJul 13, 13:30 UTC1h 15m
2026-07-13 SWA2546 MCI → DEN Jul 13, 12:12 UTCJul 13, 13:25 UTC1h 14m
2026-07-13 SWA4698 - Jul 13, 07:20 UTCJul 13, 08:30 UTC1h 10m
2026-07-13 SWA3254 PHX → DAL Jul 13, 04:09 UTCJul 13, 06:16 UTC2h 8m
2026-07-13 SWA3254 - Jul 13, 04:10 UTCJul 13, 06:15 UTC2h 5m
2026-07-13 SWA701 LAS → PHX Jul 13, 00:30 UTCJul 13, 01:20 UTC50m
2026-07-12 SWA2016 DEN → LAS Jul 12, 21:35 UTCJul 12, 23:00 UTC1h 25m
2026-07-12 SWA2768 - Jul 12, 18:35 UTCJul 12, 18:45 UTC10m
2026-07-12 SWA2768 MDW → DEN Jul 12, 18:31 UTCJul 12, 20:25 UTC1h 54m
2026-07-12 SWA3149 - Jul 12, 15:35 UTCJul 12, 17:10 UTC1h 35m
2026-07-12 SWA3149 ORF → MDW Jul 12, 15:32 UTCJul 12, 17:12 UTC1h 40m
2026-07-12 SWA1470 - Jul 12, 13:01 UTCJul 12, 14:35 UTC1h 35m
2026-07-12 SWA1470 MDW → ORF Jul 12, 12:56 UTCJul 12, 14:31 UTC1h 35m
2026-07-12 SWA4057 - Jul 12, 10:25 UTCJul 12, 11:45 UTC1h 20m
2026-07-12 SWA1328 - Jul 12, 05:30 UTCJul 12, 06:35 UTC1h 5m
2026-07-12 SWA1328 DEN → DAL Jul 12, 01:40 UTCJul 12, 03:45 UTC2h 5m
2026-07-11 SWA450 - Jul 11, 21:20 UTCJul 12, 00:20 UTC3h 0m
2026-07-11 SWA450 BUF → DEN Jul 11, 21:16 UTCJul 12, 00:05 UTC2h 49m
2026-07-11 SWA3466 - Jul 11, 16:10 UTCJul 11, 18:45 UTC2h 35m
2026-07-11 SWA3466 PHX → BUF Jul 11, 16:10 UTCJul 11, 19:56 UTC3h 46m
2026-07-11 SWA1057 - Jul 11, 13:30 UTCJul 11, 15:10 UTC1h 40m
2026-07-11 SWA2429 - Jul 11, 04:55 UTCJul 11, 05:55 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 N8504G page for operator, model, and routing details .

Mode-S ABAA43 frequently asked

What is Mode-S code ABAA43?
ABAA43 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8504G.
Where is Mode-S ABAA43 registered?
Mode-S code ABAA43 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 ABAA43 broadcasting right now?
No active broadcast right now. Last signal was Jul 16, 14:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAA43, octal 52725103, decimal 11,250,243.
What flights does ABAA43 operate?
Mode-S ABAA43 has broadcast 20 distinct callsigns, including SWA4112, SWA4076, SWA3402, SWA2971, SWA273.