Apparatus

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sensors Mode-S transponder

AC08B1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8748Q · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
AC08B1
Octal
53004261
Decimal
11,274,417
Country
US
Tail
N8748Q
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
637
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AC08B1.

Country allocation

The ICAO 24-bit address AC08B1 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
SWA2332 Southwest Airlines 9 2026-06-03
SWA2525 Southwest Airlines 7 2026-06-03
SWA3218 - 6 2026-07-07
SWA1916 - 6 2026-07-07
SWA3783 Southwest Airlines 5 2026-06-10
SWA2711 Southwest Airlines 5 2026-06-13
SWA2321 Southwest Airlines 5 2026-06-23
SWA1775 Southwest Airlines 5 2026-05-28
SWA3409 Southwest Airlines 4 2026-05-28
SWA2848 - 4 2026-07-16
SWA611 - 3 2026-07-21
SWA4365 - 3 2026-07-17
SWA4279 Southwest Airlines 3 2026-05-05
SWA4251 - 3 2026-07-12
SWA409 - 3 2026-06-28
SWA4012 Southwest Airlines 3 2026-06-22
SWA3993 Southwest Airlines 3 2026-05-15
SWA3982 - 3 2026-04-14
SWA3804 Southwest Airlines 3 2026-05-09
SWA3781 - 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3597 MCO → PVD Jul 26, 20:30 UTCJul 26, 21:45 UTC1h 15m
2026-07-26 SWA2902 DEN → IAD Jul 26, 18:35 UTCJul 26, 19:20 UTC45m
2026-07-26 SWA4416 MCO → MDW Jul 26, 14:55 UTCJul 26, 17:25 UTC2h 30m
2026-07-26 SWA3550 DAL → BWI Jul 26, 12:00 UTCJul 26, 13:45 UTC1h 45m
2026-07-25 SWA1640 BWI → RDU Jul 25, 22:55 UTCJul 26, 01:35 UTC2h 40m
2026-07-25 SWA4790 DEN → ORD Jul 25, 17:55 UTCJul 25, 20:30 UTC2h 35m
2026-07-25 SWA4790 DEN → ORD Jul 25, 17:52 UTCJul 25, 20:32 UTC2h 41m
2026-07-25 SWA2251 HOU → OAK Jul 25, 10:40 UTCJul 25, 13:05 UTC2h 25m
2026-07-25 SWA2026 BWI → FLL Jul 25, 02:45 UTCJul 25, 04:45 UTC2h 0m
2026-07-24 SWA1018 CUN → DEN Jul 24, 20:40 UTCJul 25, 00:00 UTC3h 20m
2026-07-24 SWA1735 PHX → CUN Jul 24, 15:25 UTCJul 24, 19:05 UTC3h 40m
2026-07-24 SWA1735 PHX → CUN Jul 24, 15:20 UTCJul 24, 19:00 UTC3h 40m
2026-07-24 SWA2277 BLI → OAK Jul 24, 08:00 UTCJul 24, 13:30 UTC5h 30m
2026-07-23 SWA2240 LAX → MDW Jul 23, 17:45 UTCJul 23, 23:35 UTC5h 50m
2026-07-23 SWA4348 SRQ → ATL Jul 23, 14:50 UTCJul 23, 15:55 UTC1h 5m
2026-07-23 SWA4348 SRQ → ATL Jul 23, 14:47 UTCJul 23, 15:54 UTC1h 7m
2026-07-23 SWA2523 SJC → SNA Jul 23, 07:35 UTCJul 23, 11:45 UTC4h 10m
2026-07-22 SWA3058 BNA → DAL Jul 22, 20:55 UTCJul 23, 02:20 UTC5h 25m
2026-07-22 SWA3058 BNA → DAL Jul 22, 20:55 UTCJul 23, 02:10 UTC5h 15m
2026-07-22 SWA4539 DEN → BUF Jul 22, 18:00 UTCJul 22, 19:25 UTC1h 25m
2026-07-22 SWA761 PHX → DEN Jul 22, 15:20 UTCJul 22, 17:00 UTC1h 40m
2026-07-22 SWA4123 BUR → OAK Jul 22, 12:00 UTCJul 22, 13:50 UTC1h 50m
2026-07-22 SWA4123 BUR → OAK Jul 22, 11:55 UTCJul 22, 13:47 UTC1h 52m
2026-07-22 SWA4404 MSY → BUR Jul 22, 00:50 UTCJul 22, 03:05 UTC2h 15m
2026-07-21 SWA1721 LAS → STL Jul 21, 19:55 UTCJul 21, 22:40 UTC2h 45m
2026-07-21 SWA1721 LAS → STL Jul 21, 19:42 UTCJul 21, 22:36 UTC2h 55m
2026-07-21 SWA1873 - Jul 21, 14:55 UTCJul 21, 17:20 UTC2h 25m
2026-07-21 SWA1873 MCO → SXM Jul 21, 14:51 UTCJul 21, 17:46 UTC2h 55m
2026-07-21 SWA4508 BWI → FLL Jul 21, 06:45 UTCJul 21, 10:35 UTC3h 50m
2026-07-21 SWA3125 OKC → PHX Jul 21, 03:15 UTCJul 21, 05:35 UTC2h 20m
2026-07-21 SWA3125 OKC → PHX Jul 21, 03:20 UTCJul 21, 05:35 UTC2h 15m
2026-07-21 SWA611 LAS → OKC Jul 21, 00:25 UTCJul 21, 02:35 UTC2h 10m
2026-07-21 SWA611 LAS → OKC Jul 21, 00:25 UTCJul 21, 02:33 UTC2h 8m
2026-07-20 SWA611 PHX → LAS Jul 20, 22:30 UTCJul 20, 23:15 UTC45m
2026-07-20 SWA3623 MHT → MCO Jul 20, 18:55 UTCJul 20, 21:25 UTC2h 30m
2026-07-20 SWA1406 DAL → TPA Jul 20, 13:25 UTCJul 20, 16:50 UTC3h 25m
2026-07-20 SWA1406 DAL → TPA Jul 20, 10:20 UTCJul 20, 12:25 UTC2h 5m
2026-07-20 SWA2090 - Jul 20, 03:05 UTCJul 20, 04:55 UTC1h 50m
2026-07-19 SWA817 LIR → HOU Jul 19, 20:50 UTCJul 19, 23:10 UTC2h 20m
2026-07-19 SWA691 - Jul 19, 15:55 UTCJul 19, 18:05 UTC2h 10m
2026-07-19 SWA4668 - Jul 19, 12:30 UTCJul 19, 14:45 UTC2h 15m
2026-07-19 SWA3300 MDW → MEM Jul 19, 00:20 UTCJul 19, 01:05 UTC45m
2026-07-18 SWA2526 STL → SAN Jul 18, 20:00 UTCJul 18, 23:10 UTC3h 10m
2026-07-18 SWA1886 - Jul 18, 15:10 UTCJul 18, 17:40 UTC2h 30m
2026-07-18 SWA1886 CUN → STL Jul 18, 15:09 UTCJul 18, 17:40 UTC2h 31m
2026-07-18 SWA414 - Jul 18, 10:45 UTCJul 18, 13:50 UTC3h 5m
2026-07-18 SWA414 PIT → CUN Jul 18, 10:44 UTCJul 18, 13:51 UTC3h 7m
2026-07-18 SWA4164 - Jul 18, 03:50 UTCJul 18, 04:25 UTC35m
2026-07-18 SWA4164 BWI → PIT Jul 18, 03:47 UTCJul 18, 04:25 UTC38m
2026-07-18 SWA1624 - Jul 18, 00:45 UTCJul 18, 02:50 UTC2h 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 N8748Q page for operator, model, and routing details .

Mode-S AC08B1 frequently asked

What is Mode-S code AC08B1?
AC08B1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8748Q.
Where is Mode-S AC08B1 registered?
Mode-S code AC08B1 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 AC08B1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC08B1, octal 53004261, decimal 11,274,417.
What flights does AC08B1 operate?
Mode-S AC08B1 has broadcast 20 distinct callsigns, including SWA2332, SWA2525, SWA3218, SWA1916, SWA3783.