Apparatus

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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 Jul 26, 21:10 UTC
Flights observed
688
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

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
SWA2523 - 5 2026-07-15
SWA2409 - 5 2026-07-21
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
SWA2350 - 4 2026-07-02
SWA2262 - 4 2026-07-15
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
SWA4537 - 3 2026-07-18
SWA4238 Southwest Airlines 3 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA103 PHL → MDW Jul 26, 20:00 UTCJul 26, 21:05 UTC1h 5m
2026-07-26 SWA2419 BWI → BDL Jul 26, 15:30 UTCJul 26, 18:20 UTC2h 50m
2026-07-26 SWA4049 DEN → MCO Jul 26, 12:25 UTCJul 26, 14:20 UTC1h 55m
2026-07-26 SWA4049 DEN → MCO Jul 26, 12:25 UTCJul 26, 14:18 UTC1h 53m
2026-07-26 SWA4929 BWI → LAX Jul 26, 09:30 UTCJul 26, 11:25 UTC1h 55m
2026-07-26 SWA505 MIA → DAL Jul 26, 01:55 UTCJul 26, 05:40 UTC3h 45m
2026-07-25 SWA4359 PHL → MDW Jul 25, 21:55 UTCJul 26, 00:45 UTC2h 50m
2026-07-25 SWA3699 OAK → BUR Jul 25, 18:30 UTCJul 25, 20:40 UTC2h 10m
2026-07-25 SWA3699 OAK → BUR Jul 25, 18:25 UTCJul 25, 20:33 UTC2h 8m
2026-07-25 SWA2669 BUR → SFO Jul 25, 15:05 UTCJul 25, 17:30 UTC2h 25m
2026-07-25 SWA1280 BOS → BWI Jul 25, 11:10 UTCJul 25, 13:50 UTC2h 40m
2026-07-25 SWA2388 BUR → SJC Jul 25, 01:10 UTCJul 25, 03:55 UTC2h 45m
2026-07-24 SWA2388 BUR → SJC Jul 24, 23:10 UTCJul 25, 00:00 UTC50m
2026-07-24 SWA3304 SJC → PHX Jul 24, 19:40 UTCJul 24, 21:50 UTC2h 10m
2026-07-24 SWA3304 SJC → PHX Jul 24, 19:35 UTCJul 24, 21:43 UTC2h 9m
2026-07-24 SWA126 SAN → OAK Jul 24, 16:50 UTCJul 24, 18:30 UTC1h 40m
2026-07-24 SWA126 SAN → OAK Jul 24, 16:45 UTCJul 24, 18:30 UTC1h 45m
2026-07-24 SWA4943 GEG → PHX Jul 24, 14:10 UTCJul 24, 15:40 UTC1h 30m
2026-07-24 SWA332 MCO → MDW Jul 24, 10:25 UTCJul 24, 13:00 UTC2h 35m
2026-07-24 SWA2186 LAS → SFO Jul 24, 04:35 UTCJul 24, 06:50 UTC2h 15m
2026-07-24 SWA2003 OAK → ONT Jul 24, 01:00 UTCJul 24, 03:40 UTC2h 40m
2026-07-23 SWA41 HOU → MSY Jul 23, 22:37 UTCJul 23, 23:44 UTC1h 8m
2026-07-23 SWA41 HOU → MSY Jul 23, 22:40 UTCJul 23, 23:45 UTC1h 5m
2026-07-23 SWA4585 SJC → LAS Jul 23, 19:15 UTCJul 23, 21:15 UTC2h 0m
2026-07-23 SWA320 SJC → SNA Jul 23, 15:50 UTCJul 23, 17:50 UTC2h 0m
2026-07-23 SWA320 SJC → SNA Jul 23, 15:47 UTCJul 23, 17:54 UTC2h 7m
2026-07-23 SWA1474 BOS → MDW Jul 23, 12:50 UTCJul 23, 14:40 UTC1h 50m
2026-07-23 SWA2935 ONT → OAK Jul 23, 03:50 UTCJul 23, 05:50 UTC2h 0m
2026-07-23 SWA2935 ONT → OAK Jul 23, 01:15 UTCJul 23, 02:40 UTC1h 25m
2026-07-22 SWA4368 SAN → OAK Jul 22, 22:50 UTCJul 23, 00:00 UTC1h 10m
2026-07-22 SWA2676 BWI → PWM Jul 22, 18:20 UTCJul 22, 21:40 UTC3h 20m
2026-07-22 SWA2676 BWI → PWM Jul 22, 18:16 UTCJul 22, 21:37 UTC3h 21m
2026-07-21 SWA2243 BUR → OAK Jul 21, 23:35 UTCJul 22, 02:10 UTC2h 35m
2026-07-21 SWA4595 LGB → LAS Jul 21, 21:00 UTCJul 21, 22:23 UTC1h 23m
2026-07-21 SWA4595 LGB → LAS Jul 21, 19:05 UTCJul 21, 22:25 UTC3h 20m
2026-07-21 SWA4651 - Jul 21, 15:30 UTCJul 21, 17:40 UTC2h 10m
2026-07-21 SWA4139 TPA → STL Jul 21, 11:45 UTCJul 21, 14:05 UTC2h 20m
2026-07-21 SWA2409 - Jul 21, 05:45 UTCJul 21, 10:20 UTC4h 35m
2026-07-21 SWA4802 PHX → FLL Jul 21, 01:00 UTCJul 21, 03:55 UTC2h 55m
2026-07-20 SWA306 CUN → HOU Jul 20, 16:35 UTCJul 20, 18:25 UTC1h 50m
2026-07-20 SWA306 CUN → HOU Jul 20, 16:31 UTCJul 20, 18:29 UTC1h 59m
2026-07-20 SWA751 MCI → CUN Jul 20, 11:40 UTCJul 20, 14:35 UTC2h 55m
2026-07-20 SWA563 - Jul 20, 04:30 UTCJul 20, 05:35 UTC1h 5m
2026-07-20 SWA2437 - Jul 20, 01:35 UTCJul 20, 02:45 UTC1h 10m
2026-07-20 SWA2437 PIT → BNA Jul 20, 01:34 UTCJul 20, 02:41 UTC1h 7m
2026-07-19 SWA3451 - Jul 19, 22:10 UTCJul 20, 00:15 UTC2h 5m
2026-07-19 SWA1622 DEN → SFO Jul 19, 18:30 UTCJul 19, 20:15 UTC1h 45m
2026-07-19 SWA1622 DEN → SFO Jul 19, 18:26 UTCJul 19, 20:13 UTC1h 48m
2026-07-19 SWA3379 DEN → BDL Jul 19, 15:20 UTCJul 19, 17:10 UTC1h 50m
2026-07-18 SWA4537 - Jul 18, 20:45 UTCJul 18, 22:40 UTC1h 55m

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 Jul 26, 21:10 UTC.
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, SWA2523, SWA2409, SWA2252, SWA2232.