Apparatus

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sensors Mode-S transponder

ABAAFE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8509U · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABAAFE
Octal
52725376
Decimal
11,250,430
Country
US
Tail
N8509U
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
730
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S ABAAFE.

Country allocation

The ICAO 24-bit address ABAAFE 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
SWA2104 - 9 2026-07-08
SWA4128 Southwest Airlines 5 2026-07-20
SWA846 Southwest Airlines 4 2026-04-14
SWA614 Southwest Airlines 4 2026-07-25
SWA572 - 4 2026-07-14
SWA4095 Southwest Airlines 4 2026-04-17
SWA3988 - 4 2026-07-07
SWA3391 Southwest Airlines 4 2026-07-24
SWA1388 Southwest Airlines 4 2026-07-24
SWA1332 - 4 2026-07-14
SWA503 Southwest Airlines 3 2026-07-23
SWA4541 Southwest Airlines 3 2026-06-20
SWA4385 Southwest Airlines 3 2026-07-20
SWA437 - 3 2026-06-17
SWA4154 Southwest Airlines 3 2026-06-25
SWA406 Southwest Airlines 3 2026-05-28
SWA3996 Southwest Airlines 3 2026-07-25
SWA3659 Southwest Airlines 3 2026-05-23
SWA3452 Southwest Airlines 3 2026-05-01
SWA343 Southwest Airlines 3 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2935 ONT → OAK Jul 26, 21:15 UTCJul 26, 21:30 UTC15m
2026-07-26 SWA3238 SNA → OAK Jul 26, 17:35 UTCJul 26, 20:05 UTC2h 30m
2026-07-26 SWA1733 PHL → BNA Jul 26, 14:19 UTCJul 26, 16:31 UTC2h 12m
2026-07-26 SWA1733 PHL → BNA Jul 26, 14:20 UTCJul 26, 16:30 UTC2h 10m
2026-07-26 SWA3159 LAS → ORD Jul 26, 01:50 UTCJul 26, 02:35 UTC45m
2026-07-26 SWA3159 LAS → ORD Jul 26, 01:45 UTCJul 26, 02:34 UTC49m
2026-07-25 SWA2949 DAL → LAS Jul 25, 23:10 UTCJul 26, 00:55 UTC1h 45m
2026-07-25 SWA2117 OAK → LAX Jul 25, 19:35 UTCJul 25, 21:50 UTC2h 15m
2026-07-25 SWA2117 OAK → LAX Jul 25, 19:30 UTCJul 25, 21:45 UTC2h 15m
2026-07-25 SWA3996 RSW → IND Jul 25, 15:30 UTCJul 25, 18:30 UTC3h 0m
2026-07-25 SWA614 DEN → AUS Jul 25, 05:29 UTCJul 25, 06:21 UTC53m
2026-07-25 SWA4260 ATL → BNA Jul 25, 02:00 UTCJul 25, 03:00 UTC1h 0m
2026-07-24 SWA4143 SYR → TPA Jul 24, 21:40 UTCJul 25, 00:00 UTC2h 20m
2026-07-24 SWA1140 SJC → LAS Jul 24, 17:55 UTCJul 24, 20:10 UTC2h 15m
2026-07-24 SWA1140 SJC → LAS Jul 24, 17:50 UTCJul 24, 20:00 UTC2h 10m
2026-07-24 SWA469 SMF → LAX Jul 24, 15:40 UTCJul 24, 16:50 UTC1h 10m
2026-07-24 SWA3391 MDW → CMH Jul 24, 13:15 UTCJul 24, 14:15 UTC1h 0m
2026-07-24 SWA3391 MDW → CMH Jul 24, 13:10 UTCJul 24, 14:15 UTC1h 5m
2026-07-24 SWA1388 DEN → PDX Jul 24, 01:40 UTCJul 24, 03:00 UTC1h 20m
2026-07-23 SWA1388 DEN → PDX Jul 23, 22:50 UTCJul 24, 00:20 UTC1h 30m
2026-07-23 SWA503 LAX → STL Jul 23, 19:10 UTCJul 23, 21:25 UTC2h 15m
2026-07-23 SWA3478 MIA → BNA Jul 23, 14:15 UTCJul 23, 17:45 UTC3h 30m
2026-07-22 SWA1752 DEN → MCI Jul 22, 23:59 UTCJul 23, 01:18 UTC1h 19m
2026-07-22 SWA1088 MSY → LGA Jul 22, 03:05 UTCJul 23, 01:30 UTC22h 25m
2026-07-21 SWA1700 SJC → SNA Jul 21, 16:06 UTCJul 21, 17:55 UTC1h 50m
2026-07-21 SWA1700 SJC → SNA Jul 21, 16:10 UTCJul 21, 17:55 UTC1h 45m
2026-07-21 SWA3615 BNA → TPA Jul 21, 12:35 UTCJul 21, 14:45 UTC2h 10m
2026-07-21 SWA963 DEN → SEA Jul 21, 06:10 UTCJul 21, 08:00 UTC1h 50m
2026-07-21 SWA1128 - Jul 21, 01:35 UTCJul 21, 03:55 UTC2h 20m
2026-07-21 SWA1128 DAL → LAS Jul 21, 01:32 UTCJul 21, 03:50 UTC2h 18m
2026-07-20 SWA1219 - Jul 20, 23:15 UTCJul 21, 00:40 UTC1h 24m
2026-07-20 SWA4385 SAN → SFO Jul 20, 20:25 UTCJul 20, 22:05 UTC1h 40m
2026-07-20 SWA4414 - Jul 20, 18:10 UTCJul 20, 19:10 UTC1h 0m
2026-07-20 SWA4414 OKC → HOU Jul 20, 18:07 UTCJul 20, 19:12 UTC1h 5m
2026-07-20 SWA4128 PHX → SFO Jul 20, 16:15 UTCJul 20, 16:50 UTC35m
2026-07-20 SWA4128 PHX → SFO Jul 20, 16:10 UTCJul 20, 16:47 UTC37m
2026-07-20 SWA4128 PHX → SFO Jul 20, 12:20 UTCJul 20, 15:05 UTC2h 45m
2026-07-20 SWA3648 - Jul 20, 05:40 UTCJul 20, 06:35 UTC55m
2026-07-20 SWA3710 DAL → DCA Jul 20, 03:25 UTCJul 20, 04:35 UTC1h 10m
2026-07-20 SWA3710 DAL → DCA Jul 20, 00:10 UTCJul 20, 01:30 UTC1h 20m
2026-07-19 SWA3043 OAK → DEN Jul 19, 20:15 UTCJul 19, 22:45 UTC2h 30m
2026-07-19 SWA3043 OAK → DEN Jul 19, 20:14 UTCJul 19, 22:30 UTC2h 17m
2026-07-19 SWA3937 MSY → MCI Jul 19, 18:15 UTCJul 19, 19:05 UTC50m
2026-07-19 SWA3937 MSY → MCI Jul 19, 13:40 UTCJul 19, 16:45 UTC3h 5m
2026-07-19 SWA752 DEN → AUS Jul 19, 10:05 UTCJul 19, 12:30 UTC2h 25m
2026-07-18 SWA4930 - Jul 18, 21:50 UTCJul 19, 02:55 UTC5h 5m
2026-07-18 SWA458 LAS → SAN Jul 18, 19:40 UTCJul 18, 20:20 UTC40m
2026-07-18 SWA3993 BWI → AUS Jul 18, 14:45 UTCJul 18, 17:55 UTC3h 10m
2026-07-18 SWA3993 BWI → AUS Jul 18, 14:44 UTCJul 18, 17:53 UTC3h 9m
2026-07-18 SWA3391 - Jul 18, 12:10 UTCJul 18, 13:10 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 N8509U page for operator, model, and routing details .

Mode-S ABAAFE frequently asked

What is Mode-S code ABAAFE?
ABAAFE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8509U.
Where is Mode-S ABAAFE registered?
Mode-S code ABAAFE 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 ABAAFE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAAFE, octal 52725376, decimal 11,250,430.
What flights does ABAAFE operate?
Mode-S ABAAFE has broadcast 20 distinct callsigns, including SWA2104, SWA4128, SWA846, SWA614, SWA572.