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sensors Mode-S transponder

AC0048

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8721J · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC0048
Octal
53000110
Decimal
11,272,264
Country
US
Tail
N8721J
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
618
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AC0048.

Country allocation

The ICAO 24-bit address AC0048 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 7 2026-05-19
SWA2252 Southwest Airlines 5 2026-06-08
SWA2232 - 5 2026-06-25
SWA4365 - 4 2026-06-26
SWA406 Southwest Airlines 4 2026-06-01
SWA3042 Southwest Airlines 4 2026-06-13
SWA2525 Southwest Airlines 4 2026-05-02
SWA2523 Southwest Airlines 4 2026-05-21
SWA2409 - 4 2026-06-27
SWA2350 - 4 2026-07-02
SWA2254 Southwest Airlines 4 2026-05-21
SWA1203 - 4 2026-07-04
SWA1167 Southwest Airlines 4 2026-04-16
SWA578 Southwest Airlines 3 2026-05-29
SWA507 Southwest Airlines 3 2026-06-05
SWA496 Southwest Airlines 3 2026-05-13
SWA4863 Southwest Airlines 3 2026-06-27
SWA4238 Southwest Airlines 3 2026-05-11
SWA4200 Southwest Airlines 3 2026-04-26
SWA4175 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA3058 - Jul 14, 21:05 UTCJul 15, 02:00 UTC4h 54m
2026-07-14 SWA4539 - Jul 14, 17:55 UTCJul 14, 19:15 UTC1h 20m
2026-07-14 SWA761 - Jul 14, 15:25 UTCJul 14, 17:00 UTC1h 35m
2026-07-14 SWA4123 - Jul 14, 12:15 UTCJul 14, 14:15 UTC2h 0m
2026-07-14 SWA4123 SAT → PHX Jul 14, 12:13 UTCJul 14, 14:12 UTC1h 59m
2026-07-14 SWA4404 MCO → SAT Jul 14, 02:45 UTCJul 14, 05:10 UTC2h 25m
2026-07-14 SWA4404 MCO → SAT Jul 14, 02:45 UTCJul 14, 05:11 UTC2h 26m
2026-07-13 SWA4537 IND → MCO Jul 13, 23:30 UTCJul 14, 01:25 UTC1h 55m
2026-07-13 SWA4537 IND → MCO Jul 13, 23:26 UTCJul 14, 01:22 UTC1h 57m
2026-07-13 SWA560 - Jul 13, 21:25 UTCJul 13, 22:35 UTC1h 10m
2026-07-13 SWA560 ATL → IND Jul 13, 21:21 UTCJul 13, 22:34 UTC1h 13m
2026-07-13 SWA2258 DEN → ATL Jul 13, 17:40 UTCJul 13, 20:20 UTC2h 40m
2026-07-13 SWA2629 MCO → DEN Jul 13, 12:45 UTCJul 13, 16:00 UTC3h 15m
2026-07-13 SWA2629 MCO → DEN Jul 13, 12:43 UTCJul 13, 15:58 UTC3h 16m
2026-07-13 SWA3374 - Jul 13, 09:20 UTCJul 13, 11:10 UTC1h 50m
2026-07-13 SWA4993 - Jul 13, 01:05 UTCJul 13, 03:20 UTC2h 15m
2026-07-13 SWA4993 FLL → PIT Jul 13, 01:05 UTCJul 13, 03:18 UTC2h 13m
2026-07-12 SWA1561 DEN → FLL Jul 12, 20:12 UTCJul 12, 23:35 UTC3h 24m
2026-07-12 SWA1561 DEN → FLL Jul 12, 20:15 UTCJul 12, 23:40 UTC3h 25m
2026-07-12 SWA4346 MSP → DEN Jul 12, 16:55 UTCJul 12, 18:20 UTC1h 25m
2026-07-12 SWA3420 DEN → MSP Jul 12, 14:10 UTCJul 12, 15:45 UTC1h 35m
2026-07-12 SWA2861 - Jul 12, 10:50 UTCJul 12, 12:45 UTC1h 55m
2026-07-12 SWA1797 MCO → MEM Jul 12, 01:35 UTCJul 12, 03:25 UTC1h 50m
2026-07-12 SWA1797 MCO → MEM Jul 12, 01:34 UTCJul 12, 03:26 UTC1h 52m
2026-07-11 SWA3656 - Jul 11, 22:45 UTCJul 11, 23:55 UTC1h 10m
2026-07-11 SWA3656 BHM → MCO Jul 11, 22:41 UTCJul 11, 23:58 UTC1h 17m
2026-07-11 SWA2178 - Jul 11, 20:45 UTCJul 11, 21:55 UTC1h 10m
2026-07-11 SWA3716 - Jul 11, 19:40 UTCJul 11, 19:50 UTC10m
2026-07-11 SWA3716 - Jul 11, 17:30 UTCJul 11, 19:35 UTC2h 5m
2026-07-11 SWA1742 DEN → IND Jul 11, 14:05 UTCJul 11, 16:10 UTC2h 5m
2026-07-11 SWA1769 - Jul 11, 11:25 UTCJul 11, 12:45 UTC1h 20m
2026-07-11 SWA2940 DEN → DSM Jul 11, 02:57 UTCJul 11, 04:09 UTC1h 12m
2026-07-11 SWA2940 DEN → DSM Jul 11, 03:01 UTCJul 11, 04:10 UTC1h 10m
2026-07-10 SWA2161 - Jul 10, 21:55 UTCJul 11, 01:30 UTC3h 35m
2026-07-10 SWA1317 - Jul 10, 18:55 UTCJul 10, 20:50 UTC1h 55m
2026-07-10 SWA1317 DAL → JAX Jul 10, 18:51 UTCJul 10, 20:47 UTC1h 56m
2026-07-10 SWA1317 - Jul 10, 15:25 UTCJul 10, 17:40 UTC2h 15m
2026-07-10 SWA3607 - Jul 10, 10:30 UTCJul 10, 14:00 UTC3h 30m
2026-07-10 SWA2339 LAS → SDF Jul 10, 01:15 UTCJul 10, 04:45 UTC3h 30m
2026-07-09 SWA2339 - Jul 9, 23:05 UTCJul 10, 00:05 UTC1h 0m
2026-07-09 SWA3862 - Jul 9, 21:05 UTCJul 9, 22:00 UTC55m
2026-07-09 SWA4175 DEN → SNA Jul 9, 18:03 UTCJul 9, 19:58 UTC1h 55m
2026-07-09 SWA4175 - Jul 9, 18:05 UTCJul 9, 20:00 UTC1h 55m
2026-07-09 SWA3910 STL → DEN Jul 9, 14:50 UTCJul 9, 16:45 UTC1h 55m
2026-07-09 SWA1751 DEN → STL Jul 9, 11:45 UTCJul 9, 13:20 UTC1h 35m
2026-07-09 SWA2649 - Jul 9, 03:00 UTCJul 9, 04:50 UTC1h 50m
2026-07-09 SWA3088 OAK → SNA Jul 9, 00:51 UTCJul 9, 01:55 UTC1h 4m
2026-07-09 SWA3088 - Jul 9, 00:55 UTCJul 9, 01:55 UTC1h 0m
2026-07-08 SWA3197 PHX → OAK Jul 8, 22:10 UTCJul 8, 23:40 UTC1h 30m
2026-07-08 SWA3816 SMF → PHX Jul 8, 19:25 UTCJul 8, 20:55 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 N8721J page for operator, model, and routing details .

Mode-S AC0048 frequently asked

What is Mode-S code AC0048?
AC0048 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8721J.
Where is Mode-S AC0048 registered?
Mode-S code AC0048 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 AC0048 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC0048, octal 53000110, decimal 11,272,264.
What flights does AC0048 operate?
Mode-S AC0048 has broadcast 20 distinct callsigns, including SWA2332, SWA2252, SWA2232, SWA4365, SWA406.