Apparatus

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sensors Mode-S transponder

ABEF54

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8683D · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABEF54
Octal
52767524
Decimal
11,267,924
Country
US
Tail
N8683D
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
742
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S ABEF54.

Country allocation

The ICAO 24-bit address ABEF54 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
SWA2193 Southwest Airlines 6 2026-05-30
SWA821 - 4 2026-07-12
SWA3578 Southwest Airlines 4 2026-06-06
SWA2798 Southwest Airlines 4 2026-07-23
SWA2231 Southwest Airlines 4 2026-06-23
SWA2174 - 4 2026-04-15
SWA164 Southwest Airlines 4 2026-04-16
SWA1588 Southwest Airlines 4 2026-05-27
SWA894 Southwest Airlines 3 2026-05-08
SWA846 Southwest Airlines 3 2026-04-22
SWA4744 - 3 2026-07-08
SWA4548 - 3 2026-07-03
SWA451 Southwest Airlines 3 2026-04-17
SWA4474 Southwest Airlines 3 2026-06-08
SWA3895 Southwest Airlines 3 2026-05-11
SWA3892 Southwest Airlines 3 2026-07-22
SWA3690 Southwest Airlines 3 2026-06-01
SWA3559 Southwest Airlines 3 2026-05-15
SWA3431 Southwest Airlines 3 2026-07-22
SWA3004 Southwest Airlines 3 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2018 SJD → SMF Jul 26, 22:35 UTCJul 26, 23:00 UTC25m
2026-07-26 SWA870 HOU → SJD Jul 26, 18:05 UTCJul 26, 19:10 UTC1h 5m
2026-07-26 SWA870 HOU → SJD Jul 26, 18:02 UTCJul 26, 20:16 UTC2h 14m
2026-07-26 SWA3627 ISP → PBI Jul 26, 14:20 UTCJul 26, 16:35 UTC2h 15m
2026-07-26 SWA3627 ISP → PBI Jul 26, 14:20 UTCJul 26, 16:35 UTC2h 15m
2026-07-26 SWA2550 BWI → MCO Jul 26, 04:00 UTCJul 26, 06:25 UTC2h 25m
2026-07-25 SWA4061 LGA → HOU Jul 25, 22:30 UTCJul 26, 02:45 UTC4h 15m
2026-07-25 SWA4061 LGA → HOU Jul 25, 22:28 UTCJul 26, 02:43 UTC4h 16m
2026-07-25 SWA2657 MCO → HOU Jul 25, 17:40 UTCJul 25, 20:05 UTC2h 25m
2026-07-25 SWA2657 MCO → HOU Jul 25, 17:36 UTCJul 25, 20:00 UTC2h 25m
2026-07-25 SWA1267 BWI → PVD Jul 25, 14:55 UTCJul 25, 16:25 UTC1h 30m
2026-07-25 SWA1267 BWI → PVD Jul 25, 12:55 UTCJul 25, 13:40 UTC45m
2026-07-25 SWA1359 SJC → SAN Jul 25, 05:35 UTCJul 25, 07:20 UTC1h 45m
2026-07-25 SWA1359 SJC → SAN Jul 25, 05:31 UTCJul 25, 07:13 UTC1h 43m
2026-07-25 SWA1359 SJC → SAN Jul 25, 02:10 UTCJul 25, 03:35 UTC1h 25m
2026-07-24 SWA4005 MCO → BWI Jul 24, 21:55 UTCJul 24, 23:17 UTC1h 22m
2026-07-24 SWA2372 SJC → LAS Jul 24, 16:20 UTCJul 24, 20:20 UTC4h 0m
2026-07-24 SWA1182 BWI → BOS Jul 24, 11:40 UTCJul 24, 14:55 UTC3h 15m
2026-07-24 SWA1182 BWI → BOS Jul 24, 11:38 UTCJul 24, 14:50 UTC3h 13m
2026-07-24 SWA3448 PHL → BNA Jul 24, 01:25 UTCJul 24, 05:05 UTC3h 40m
2026-07-23 SWA2956 SMF → LAS Jul 23, 20:20 UTCJul 24, 00:00 UTC3h 40m
2026-07-23 SWA1626 BUR → SFO Jul 23, 16:40 UTCJul 23, 18:30 UTC1h 50m
2026-07-23 SWA2966 - Jul 23, 13:45 UTCJul 23, 15:05 UTC1h 20m
2026-07-23 SWA2966 LAS → DEN Jul 23, 13:41 UTCJul 23, 15:03 UTC1h 22m
2026-07-23 SWA2798 MDW → MSP Jul 23, 02:55 UTCJul 23, 06:15 UTC3h 20m
2026-07-23 SWA2798 MDW → MSP Jul 23, 02:54 UTCJul 23, 06:05 UTC3h 12m
2026-07-22 SWA3911 BNA → BDL Jul 22, 22:40 UTCJul 23, 01:10 UTC2h 30m
2026-07-22 SWA3892 SAN → SJC Jul 22, 20:45 UTCJul 22, 21:15 UTC30m
2026-07-22 SWA3892 SAN → SJC Jul 22, 18:30 UTCJul 22, 21:15 UTC2h 45m
2026-07-22 SWA3892 SAN → SJC Jul 22, 18:25 UTCJul 22, 20:27 UTC2h 2m
2026-07-22 SWA2902 DEN → IAD Jul 22, 16:35 UTCJul 22, 17:20 UTC45m
2026-07-22 SWA2902 DEN → IAD Jul 22, 13:40 UTCJul 22, 15:45 UTC2h 5m
2026-07-22 SWA2645 PHL → MDW Jul 22, 03:05 UTCJul 22, 04:50 UTC1h 45m
2026-07-22 SWA3431 DAL → MSY Jul 22, 00:05 UTCJul 22, 01:20 UTC1h 15m
2026-07-21 SWA506 CVG → MDW Jul 21, 22:15 UTCJul 21, 23:05 UTC50m
2026-07-21 SWA506 CVG → MDW Jul 21, 22:13 UTCJul 21, 22:58 UTC45m
2026-07-21 SWA3789 MSY → BWI Jul 21, 17:35 UTCJul 21, 19:55 UTC2h 20m
2026-07-21 SWA2668 - Jul 21, 14:55 UTCJul 21, 16:15 UTC1h 20m
2026-07-21 SWA3430 - Jul 21, 11:55 UTCJul 21, 13:10 UTC1h 15m
2026-07-21 SWA4221 - Jul 21, 00:15 UTCJul 21, 02:10 UTC1h 55m
2026-07-20 SWA2810 ROC → MDW Jul 20, 12:55 UTCJul 20, 16:20 UTC3h 25m
2026-07-20 SWA3856 DEN → SEA Jul 20, 03:55 UTCJul 20, 06:10 UTC2h 15m
2026-07-19 SWA1537 PHL → STL Jul 19, 20:20 UTCJul 19, 21:50 UTC1h 30m
2026-07-19 SWA1097 - Jul 19, 18:20 UTCJul 19, 19:10 UTC50m
2026-07-19 SWA3555 - Jul 19, 16:10 UTCJul 19, 17:10 UTC1h 0m
2026-07-19 SWA153 MAF → DAL Jul 19, 13:15 UTCJul 19, 14:40 UTC1h 25m
2026-07-19 SWA1288 SAN → ABQ Jul 19, 02:45 UTCJul 19, 04:20 UTC1h 35m
2026-07-19 SWA1288 LAS → SAN Jul 19, 01:05 UTCJul 19, 01:50 UTC45m
2026-07-18 SWA1288 EUG → LAS Jul 18, 22:00 UTCJul 18, 23:40 UTC1h 40m
2026-07-18 SWA3595 LAS → EUG Jul 18, 19:06 UTCJul 18, 20:36 UTC1h 30m

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 N8683D page for operator, model, and routing details .

Mode-S ABEF54 frequently asked

What is Mode-S code ABEF54?
ABEF54 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8683D.
Where is Mode-S ABEF54 registered?
Mode-S code ABEF54 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 ABEF54 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABEF54, octal 52767524, decimal 11,267,924.
What flights does ABEF54 operate?
Mode-S ABEF54 has broadcast 20 distinct callsigns, including SWA2193, SWA821, SWA3578, SWA2798, SWA2231.