Apparatus

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sensors Mode-S transponder

AC03FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8731J · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
AC03FF
Octal
53001777
Decimal
11,273,215
Country
US
Tail
N8731J
Type
B38M
No current signal · last broadcast Jul 26, 20:15 UTC
Flights observed
693
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:15 UTC

Last known position

Most recent position reported by Mode-S AC03FF.

Country allocation

The ICAO 24-bit address AC03FF 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
SWA3263 - 7 2026-07-05
SWA2523 Southwest Airlines 7 2026-07-17
SWA3596 - 6 2026-07-20
SWA188 Southwest Airlines 6 2026-07-01
SWA2316 Southwest Airlines 5 2026-07-26
SWA1890 Southwest Airlines 5 2026-05-13
SWA1713 - 5 2026-06-29
SWA3993 Southwest Airlines 4 2026-05-19
SWA377 - 4 2026-07-02
SWA3595 Southwest Airlines 4 2026-05-25
SWA3389 Southwest Airlines 4 2026-04-16
SWA3058 - 4 2026-07-16
SWA2540 - 4 2026-07-14
SWA2272 Southwest Airlines 4 2026-05-25
SWA1597 Southwest Airlines 4 2026-05-05
SWA9000 Southwest Airlines 3 2026-07-24
SWA8502 Southwest Airlines 3 2026-05-31
SWA706 - 3 2026-07-17
SWA642 Southwest Airlines 3 2026-04-14
SWA609 Southwest Airlines 3 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2316 BWI → CVG Jul 26, 20:00 UTCJul 26, 20:15 UTC15m
2026-07-25 SWA4452 LGA → BNA Jul 25, 22:00 UTCJul 25, 22:10 UTC10m
2026-07-25 SWA4452 LGA → BNA Jul 25, 16:35 UTCJul 25, 17:30 UTC55m
2026-07-25 SWA4452 LGA → BNA Jul 25, 16:32 UTCJul 25, 22:05 UTC5h 33m
2026-07-25 SWA2970 OAK → SNA Jul 25, 14:01 UTCJul 25, 14:50 UTC49m
2026-07-25 SWA2970 OAK → SNA Jul 25, 14:05 UTCJul 25, 14:55 UTC50m
2026-07-25 SWA2356 PVD → TPA Jul 25, 11:15 UTCJul 25, 11:55 UTC40m
2026-07-25 SWA1931 SAN → SJC Jul 25, 00:15 UTCJul 25, 00:35 UTC20m
2026-07-24 SWA3094 OAK → LAX Jul 24, 22:20 UTCJul 24, 22:40 UTC20m
2026-07-24 SWA1851 - Jul 24, 20:00 UTCJul 24, 20:20 UTC20m
2026-07-24 SWA1919 OAK → PHX Jul 24, 16:40 UTCJul 24, 16:50 UTC10m
2026-07-24 SWA1919 OAK → PHX Jul 24, 16:35 UTCJul 24, 16:57 UTC22m
2026-07-24 SWA9000 DAL → HOU Jul 24, 07:40 UTCJul 24, 07:55 UTC15m
2026-07-24 SWA9000 DAL → HOU Jul 24, 02:25 UTCJul 24, 03:10 UTC45m
2026-07-24 SWA9000 DAL → HOU Jul 24, 02:24 UTCJul 24, 07:41 UTC5h 17m
2026-07-23 SWA3540 STL → SJC Jul 23, 23:54 UTCJul 24, 00:52 UTC58m
2026-07-23 SWA2809 DAL → SAN Jul 23, 20:45 UTCJul 23, 22:55 UTC2h 10m
2026-07-23 SWA2809 DAL → SAN Jul 23, 15:40 UTCJul 23, 19:30 UTC3h 50m
2026-07-23 SWA2039 LAS → OAK Jul 23, 11:45 UTCJul 23, 13:50 UTC2h 5m
2026-07-23 SWA4315 STL → PNS Jul 23, 02:55 UTCJul 23, 05:10 UTC2h 15m
2026-07-23 SWA4315 STL → PNS Jul 23, 02:52 UTCJul 23, 05:13 UTC2h 21m
2026-07-22 SWA2493 BNA → ORD Jul 22, 23:45 UTCJul 23, 00:45 UTC1h 0m
2026-07-22 SWA3650 SMF → LGB Jul 22, 21:40 UTCJul 22, 22:45 UTC1h 5m
2026-07-22 SWA2347 - Jul 22, 19:40 UTCJul 22, 20:35 UTC55m
2026-07-22 SWA446 LGB → SJC Jul 22, 17:20 UTCJul 22, 18:30 UTC1h 10m
2026-07-22 SWA446 LGB → SJC Jul 22, 14:30 UTCJul 22, 16:05 UTC1h 35m
2026-07-22 SWA3909 MKE → PHX Jul 22, 11:25 UTCJul 22, 13:05 UTC1h 40m
2026-07-22 SWA4159 SJC → LAS Jul 22, 00:10 UTCJul 22, 01:20 UTC1h 10m
2026-07-21 SWA9005 PHX → SAN Jul 21, 21:50 UTCJul 21, 23:00 UTC1h 10m
2026-07-21 SWA4501 SMF → SNA Jul 21, 13:00 UTCJul 21, 14:55 UTC1h 55m
2026-07-21 SWA3374 IAD → DEN Jul 21, 10:05 UTCJul 21, 11:50 UTC1h 45m
2026-07-21 SWA3972 PHL → ATL Jul 21, 01:15 UTCJul 21, 02:30 UTC1h 15m
2026-07-20 SWA2904 - Jul 20, 23:15 UTCJul 21, 00:00 UTC44m
2026-07-20 SWA3596 SAV → MDW Jul 20, 20:05 UTCJul 20, 21:55 UTC1h 50m
2026-07-20 SWA3596 SAV → MDW Jul 20, 20:02 UTCJul 20, 21:54 UTC1h 52m
2026-07-20 SWA654 STL → SAV Jul 20, 17:30 UTCJul 20, 18:55 UTC1h 25m
2026-07-20 SWA4049 TPA → STL Jul 20, 14:35 UTCJul 20, 16:35 UTC2h 0m
2026-07-20 SWA1415 MCO → BWI Jul 20, 11:25 UTCJul 20, 13:35 UTC2h 10m
2026-07-20 SWA64 HOU → DAL Jul 20, 03:40 UTCJul 20, 04:20 UTC40m
2026-07-19 SWA2460 DEN → OKC Jul 19, 22:48 UTCJul 20, 02:02 UTC3h 14m
2026-07-19 SWA2460 DEN → OKC Jul 19, 22:50 UTCJul 20, 02:00 UTC3h 10m
2026-07-19 SWA2294 - Jul 19, 18:30 UTCJul 19, 20:50 UTC2h 20m
2026-07-19 SWA2294 - Jul 19, 15:00 UTCJul 19, 17:20 UTC2h 20m
2026-07-19 SWA4112 ANC → LAS Jul 19, 08:10 UTCJul 19, 12:50 UTC4h 40m
2026-07-19 SWA1575 LAS → ANC Jul 19, 01:45 UTCJul 19, 06:30 UTC4h 45m
2026-07-18 SWA2377 - Jul 18, 23:00 UTCJul 18, 23:45 UTC45m
2026-07-18 SWA3795 BNA → MKE Jul 18, 20:50 UTCJul 18, 21:55 UTC1h 5m
2026-07-18 SWA3795 BNA → MKE Jul 18, 20:50 UTCJul 18, 21:56 UTC1h 6m
2026-07-18 SWA2094 - Jul 18, 16:05 UTCJul 18, 19:40 UTC3h 35m
2026-07-18 SWA2094 MDW → SMF Jul 18, 16:01 UTCJul 18, 19:40 UTC3h 39m

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 N8731J page for operator, model, and routing details .

Mode-S AC03FF frequently asked

What is Mode-S code AC03FF?
AC03FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8731J.
Where is Mode-S AC03FF registered?
Mode-S code AC03FF 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 AC03FF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC03FF, octal 53001777, decimal 11,273,215.
What flights does AC03FF operate?
Mode-S AC03FF has broadcast 20 distinct callsigns, including SWA3263, SWA2523, SWA3596, SWA188, SWA2316.