Apparatus

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sensors Mode-S transponder

ABE4B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8657B · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABE4B9
Octal
52762271
Decimal
11,265,209
Country
US
Tail
N8657B
Type
B738
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
778
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S ABE4B9.

Country allocation

The ICAO 24-bit address ABE4B9 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
SWA2105 - 6 2026-07-11
SWA434 Southwest Airlines 5 2026-06-06
SWA3044 Southwest Airlines 5 2026-07-26
SWA1250 - 5 2026-07-11
SWA830 - 4 2026-07-11
SWA472 Southwest Airlines 4 2026-05-01
SWA4572 - 4 2026-04-13
SWA2832 - 4 2026-07-19
SWA2749 - 4 2026-07-08
SWA2731 Southwest Airlines 4 2026-06-10
SWA2530 Southwest Airlines 4 2026-05-02
SWA2189 Southwest Airlines 4 2026-07-06
SWA197 Southwest Airlines 4 2026-05-11
SWA900 Southwest Airlines 3 2026-06-15
SWA823 Southwest Airlines 3 2026-05-13
SWA615 Southwest Airlines 3 2026-06-14
SWA4395 - 3 2026-07-07
SWA3910 Southwest Airlines 3 2026-05-09
SWA3799 Southwest Airlines 3 2026-05-27
SWA3679 Southwest Airlines 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3044 PHX → OAK Jul 26, 21:15 UTCJul 26, 21:30 UTC15m
2026-07-26 SWA3976 SMF → BUR Jul 26, 20:05 UTCJul 26, 21:00 UTC55m
2026-07-26 SWA3976 SMF → BUR Jul 26, 18:25 UTCJul 26, 18:45 UTC20m
2026-07-26 SWA3369 SFO → LAS Jul 26, 14:10 UTCJul 26, 17:00 UTC2h 50m
2026-07-26 SWA2931 LGB → RNO Jul 26, 10:35 UTCJul 26, 12:55 UTC2h 20m
2026-07-26 SWA4859 RSW → STL Jul 26, 00:25 UTCJul 26, 02:35 UTC2h 10m
2026-07-25 SWA1196 MSY → HOU Jul 25, 21:05 UTCJul 25, 23:20 UTC2h 15m
2026-07-25 SWA3761 SAN → OAK Jul 25, 17:55 UTCJul 25, 20:00 UTC2h 5m
2026-07-25 SWA1385 - Jul 25, 13:50 UTCJul 25, 16:30 UTC2h 40m
2026-07-25 SWA1385 SAN → HOU Jul 25, 13:43 UTCJul 25, 16:30 UTC2h 47m
2026-07-25 SWA1704 ORD → MCO Jul 25, 04:05 UTCJul 25, 06:00 UTC1h 55m
2026-07-25 SWA3741 BDL → BWI Jul 25, 01:40 UTCJul 25, 02:35 UTC55m
2026-07-25 SWA3741 BDL → BWI Jul 25, 01:36 UTCJul 25, 02:33 UTC58m
2026-07-24 SWA4791 PHX → OAK Jul 24, 21:40 UTCJul 25, 00:45 UTC3h 5m
2026-07-24 SWA3888 IAH → DEN Jul 24, 19:35 UTCJul 24, 20:15 UTC40m
2026-07-24 SWA4979 DAL → ORD Jul 24, 17:00 UTCJul 24, 18:20 UTC1h 20m
2026-07-24 SWA4979 DAL → ORD Jul 24, 16:56 UTCJul 24, 18:19 UTC1h 24m
2026-07-24 SWA4593 CMH → TPA Jul 24, 14:15 UTCJul 24, 15:55 UTC1h 40m
2026-07-24 SWA576 LGA → DAL Jul 24, 10:40 UTCJul 24, 13:10 UTC2h 30m
2026-07-24 SWA4684 DEN → SFO Jul 24, 01:40 UTCJul 24, 03:35 UTC1h 55m
2026-07-23 SWA4684 DEN → SFO Jul 23, 22:40 UTCJul 24, 00:20 UTC1h 40m
2026-07-23 SWA3234 PHX → AUS Jul 23, 19:30 UTCJul 23, 21:25 UTC1h 55m
2026-07-23 SWA3234 PHX → AUS Jul 23, 19:28 UTCJul 23, 21:27 UTC1h 59m
2026-07-23 SWA1166 MCI → LGA Jul 23, 15:34 UTCJul 23, 17:38 UTC2h 4m
2026-07-23 SWA1166 MCI → LGA Jul 23, 15:35 UTCJul 23, 17:35 UTC2h 0m
2026-07-23 SWA2216 ALB → BWI Jul 23, 12:20 UTCJul 23, 14:40 UTC2h 20m
2026-07-23 SWA2216 ALB → BWI Jul 23, 12:16 UTCJul 23, 14:35 UTC2h 19m
2026-07-23 SWA3119 RNO → SJC Jul 23, 05:30 UTCJul 23, 07:40 UTC2h 10m
2026-07-23 SWA1653 DEN → PHX Jul 23, 03:30 UTCJul 23, 04:45 UTC1h 15m
2026-07-23 SWA3264 MCO → MSY Jul 23, 00:50 UTCJul 23, 02:05 UTC1h 15m
2026-07-22 SWA3264 MCO → MSY Jul 22, 20:15 UTCJul 22, 23:20 UTC3h 5m
2026-07-22 SWA3751 DAL → COS Jul 22, 18:05 UTCJul 22, 19:15 UTC1h 10m
2026-07-22 SWA4027 SMF → GEG Jul 22, 15:50 UTCJul 22, 16:50 UTC1h 0m
2026-07-22 SWA4436 BWI → MHT Jul 22, 11:25 UTCJul 22, 14:35 UTC3h 10m
2026-07-22 SWA421 - Jul 22, 04:15 UTCJul 22, 05:25 UTC1h 10m
2026-07-22 SWA421 MCO → BWI Jul 22, 04:13 UTCJul 22, 06:30 UTC2h 17m
2026-07-22 SWA488 DCA → PVD Jul 22, 00:40 UTCJul 22, 03:05 UTC2h 25m
2026-07-21 SWA2410 - Jul 21, 19:50 UTCJul 21, 23:30 UTC3h 40m
2026-07-21 SWA3753 SLC → PHX Jul 21, 04:05 UTCJul 21, 05:20 UTC1h 15m
2026-07-21 SWA1180 AUS → PHX Jul 21, 00:55 UTCJul 21, 03:05 UTC2h 10m
2026-07-20 SWA3633 SFO → AUS Jul 20, 20:20 UTCJul 20, 23:30 UTC3h 10m
2026-07-20 SWA3633 SFO → AUS Jul 20, 20:20 UTCJul 20, 23:35 UTC3h 15m
2026-07-20 SWA4603 PHX → SFO Jul 20, 17:20 UTCJul 20, 18:50 UTC1h 30m
2026-07-20 SWA209 - Jul 20, 15:25 UTCJul 20, 16:10 UTC45m
2026-07-20 SWA209 ATL → LAS Jul 20, 10:32 UTCJul 20, 13:57 UTC3h 26m
2026-07-20 SWA209 ATL → LAS Jul 20, 10:35 UTCJul 20, 14:00 UTC3h 25m
2026-07-20 SWA2303 SJC → BUR Jul 20, 01:40 UTCJul 20, 03:15 UTC1h 35m
2026-07-19 SWA3208 MSP → STL Jul 19, 23:10 UTCJul 20, 00:10 UTC1h 0m
2026-07-19 SWA2832 - Jul 19, 20:55 UTCJul 19, 22:00 UTC1h 5m
2026-07-19 SWA2832 MDW → MSP Jul 19, 20:52 UTCJul 19, 21:58 UTC1h 6m

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 N8657B page for operator, model, and routing details .

Mode-S ABE4B9 frequently asked

What is Mode-S code ABE4B9?
ABE4B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8657B.
Where is Mode-S ABE4B9 registered?
Mode-S code ABE4B9 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 ABE4B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABE4B9, octal 52762271, decimal 11,265,209.
What flights does ABE4B9 operate?
Mode-S ABE4B9 has broadcast 20 distinct callsigns, including SWA2105, SWA434, SWA3044, SWA1250, SWA830.