Apparatus

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sensors Mode-S transponder

AC71EF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9003B · NORTH AMERICAN Navion · operated by SOUTHWEST AIRLINES CO.

Hex
AC71EF
Octal
53070757
Decimal
11,301,359
Country
US
Tail
N9003B
Type
NAVI
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
510
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S AC71EF.

Country allocation

The ICAO 24-bit address AC71EF 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
SWA1329 - 8 2026-06-26
BOE123 - 7 2026-04-24
SWA932 - 5 2026-06-25
SWA1695 - 5 2026-06-25
SWA1567 Southwest Airlines 4 2026-05-30
SWA1267 Southwest Airlines 4 2026-07-26
SWA955 - 3 2026-07-01
SWA4795 Southwest Airlines 3 2026-06-22
SWA4450 Southwest Airlines 3 2026-06-12
SWA4052 - 3 2026-07-09
SWA3539 - 3 2026-06-23
SWA3231 Southwest Airlines 3 2026-06-19
SWA314 Southwest Airlines 3 2026-07-22
SWA2862 - 3 2026-06-30
SWA2713 - 3 2026-06-25
SWA259 Southwest Airlines 3 2026-06-04
SWA2445 - 3 2026-07-08
SWA2294 Southwest Airlines 3 2026-06-09
SWA2270 Southwest Airlines 3 2026-05-25
SWA2190 Southwest Airlines 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1693 ABQ → HOU Jul 26, 18:35 UTCJul 26, 21:25 UTC2h 50m
2026-07-26 SWA1267 BWI → PVD Jul 26, 15:15 UTCJul 26, 17:30 UTC2h 15m
2026-07-26 SWA1267 BWI → PVD Jul 26, 15:11 UTCJul 26, 17:23 UTC2h 12m
2026-07-26 SWA1267 BWI → PVD Jul 26, 13:20 UTCJul 26, 14:20 UTC1h 0m
2026-07-26 SWA1267 BWI → PVD Jul 26, 10:25 UTCJul 26, 12:10 UTC1h 45m
2026-07-25 SWA2190 LAX → SFO Jul 25, 23:15 UTCJul 26, 02:15 UTC3h 0m
2026-07-25 SWA2190 LAX → SFO Jul 25, 23:10 UTCJul 26, 02:06 UTC2h 56m
2026-07-25 SWA3619 DEN → BOS Jul 25, 18:15 UTCJul 25, 22:00 UTC3h 45m
2026-07-25 SWA1780 OAK → MDW Jul 25, 14:19 UTCJul 25, 16:43 UTC2h 25m
2026-07-25 SWA1780 OAK → MDW Jul 25, 14:20 UTCJul 25, 16:45 UTC2h 25m
2026-07-25 SWA498 OAK → BUR Jul 25, 10:40 UTCJul 25, 11:45 UTC1h 5m
2026-07-25 SWA498 OAK → BUR Jul 25, 10:40 UTCJul 25, 12:56 UTC2h 16m
2026-07-25 SWA3421 LGB → MDW Jul 25, 01:40 UTCJul 25, 02:55 UTC1h 15m
2026-07-24 SWA4820 BNA → TPA Jul 24, 23:45 UTCJul 25, 00:55 UTC1h 10m
2026-07-24 SWA5062 DAL → MCO Jul 24, 20:50 UTCJul 24, 22:15 UTC1h 25m
2026-07-24 SWA5062 DAL → MCO Jul 24, 20:49 UTCJul 24, 22:09 UTC1h 20m
2026-07-24 SWA1406 DAL → TPA Jul 24, 10:25 UTCJul 24, 12:20 UTC1h 55m
2026-07-24 SWA2232 MSY → MCO Jul 24, 02:40 UTCJul 24, 05:45 UTC3h 5m
2026-07-23 SWA2926 LAS → OAK Jul 23, 21:15 UTCJul 24, 01:25 UTC4h 10m
2026-07-23 SWA362 BOI → SJC Jul 23, 17:05 UTCJul 23, 19:35 UTC2h 30m
2026-07-23 SWA4777 SJC → SNA Jul 23, 14:10 UTCJul 23, 15:55 UTC1h 45m
2026-07-23 SWA4777 SJC → SNA Jul 23, 14:07 UTCJul 23, 15:53 UTC1h 46m
2026-07-23 SWA1261 IND → ATL Jul 23, 11:10 UTCJul 23, 12:55 UTC1h 45m
2026-07-23 SWA3003 BWI → ALB Jul 23, 04:45 UTCJul 23, 05:20 UTC35m
2026-07-22 SWA314 BNA → BWI Jul 22, 22:00 UTCJul 23, 00:05 UTC2h 5m
2026-07-22 SWA314 BNA → BWI Jul 22, 20:05 UTCJul 22, 21:00 UTC55m
2026-07-22 SWA314 BNA → BWI Jul 22, 15:20 UTCJul 22, 19:00 UTC3h 40m
2026-07-22 SWA1439 SFO → BUR Jul 22, 11:30 UTCJul 22, 14:00 UTC2h 30m
2026-07-22 SWA4232 - Jul 22, 00:50 UTCJul 22, 03:05 UTC2h 15m
2026-07-21 SWA811 BWI → BWI Jul 21, 13:00 UTCJul 21, 22:05 UTC9h 5m
2026-07-21 SWA1501 OAK → PHX Jul 21, 06:25 UTCJul 21, 09:05 UTC2h 40m
2026-07-21 SWA4845 ATL → BWI Jul 21, 03:15 UTCJul 21, 05:25 UTC2h 10m
2026-07-21 SWA4845 ATL → BWI Jul 21, 03:13 UTCJul 21, 05:20 UTC2h 7m
2026-07-20 SWA4784 - Jul 20, 21:40 UTCJul 21, 01:55 UTC4h 14m
2026-07-20 SWA4686 - Jul 20, 19:05 UTCJul 20, 19:45 UTC40m
2026-07-20 SWA4686 ATL → BNA Jul 20, 19:04 UTCJul 20, 19:40 UTC36m
2026-07-20 SWA4606 ATL → STL Jul 20, 16:40 UTCJul 20, 18:00 UTC1h 20m
2026-07-20 SWA2570 - Jul 20, 14:05 UTCJul 20, 15:00 UTC55m
2026-07-20 SWA2570 MCO → STL Jul 20, 11:00 UTCJul 20, 13:00 UTC2h 0m
2026-07-20 SWA2818 SJC → DEN Jul 20, 01:40 UTCJul 20, 03:40 UTC2h 0m
2026-07-19 SWA3879 TPA → PVD Jul 19, 21:50 UTCJul 20, 00:20 UTC2h 30m
2026-07-19 SWA4662 STL → CMH Jul 19, 18:45 UTCJul 19, 20:45 UTC2h 0m
2026-07-19 SWA4662 STL → CMH Jul 19, 18:40 UTCJul 19, 20:50 UTC2h 10m
2026-07-19 SWA2212 LAS → CMH Jul 19, 13:35 UTCJul 19, 17:05 UTC3h 30m
2026-07-19 SWA2289 - Jul 19, 03:35 UTCJul 19, 06:35 UTC3h 0m
2026-07-18 SWA2837 - Jul 18, 23:30 UTCJul 19, 01:05 UTC1h 35m
2026-07-18 SWA4669 PHX → OAK Jul 18, 19:50 UTCJul 18, 22:05 UTC2h 15m
2026-07-18 SWA4466 ATL → BWI Jul 18, 16:50 UTCJul 18, 18:30 UTC1h 40m
2026-07-18 SWA4466 ATL → BWI Jul 18, 15:10 UTCJul 18, 15:45 UTC35m
2026-07-18 SWA1731 PHL → BNA Jul 18, 12:10 UTCJul 18, 13:40 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 N9003B page for operator, model, and routing details .

Mode-S AC71EF frequently asked

What is Mode-S code AC71EF?
AC71EF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9003B.
Where is Mode-S AC71EF registered?
Mode-S code AC71EF 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 AC71EF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC71EF, octal 53070757, decimal 11,301,359.
What flights does AC71EF operate?
Mode-S AC71EF has broadcast 20 distinct callsigns, including SWA1329, BOE123, SWA932, SWA1695, SWA1567.