Apparatus

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sensors Mode-S transponder

AC71AD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9001F · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO.

Hex
AC71AD
Octal
53070655
Decimal
11,301,293
Country
US
Tail
N9001F
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
453
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AC71AD.

Country allocation

The ICAO 24-bit address AC71AD 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
SWA436 Southwest Airlines 4 2026-06-14
SWA4002 Southwest Airlines 4 2026-06-03
SWA2030 - 4 2026-06-16
SWA1485 Southwest Airlines 4 2026-06-03
SWA958 - 3 2026-06-16
SWA878 Southwest Airlines 3 2026-05-28
SWA554 - 3 2026-07-05
SWA4941 - 3 2026-07-13
SWA4677 - 3 2026-07-06
SWA4277 - 3 2026-06-22
SWA3852 - 3 2026-06-24
SWA3843 Southwest Airlines 3 2026-05-26
SWA3541 Southwest Airlines 3 2026-05-29
SWA3526 Southwest Airlines 3 2026-06-07
SWA3512 - 3 2026-07-09
SWA2537 Southwest Airlines 3 2026-05-11
SWA1648 Southwest Airlines 3 2026-06-02
SWA1517 - 3 2026-06-23
SWA1297 - 3 2026-06-25
SWA1171 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA4840 - Jul 14, 01:35 UTCJul 14, 03:45 UTC2h 10m
2026-07-13 SWA1495 DEN → MCO Jul 13, 20:40 UTCJul 14, 00:00 UTC3h 20m
2026-07-13 SWA500 - Jul 13, 17:15 UTCJul 13, 19:25 UTC2h 10m
2026-07-13 SWA4649 LAS → OAK Jul 13, 14:45 UTCJul 13, 16:00 UTC1h 15m
2026-07-13 SWA4941 - Jul 13, 12:05 UTCJul 13, 13:35 UTC1h 30m
2026-07-13 SWA4941 AUS → MCI Jul 13, 12:05 UTCJul 13, 13:33 UTC1h 28m
2026-07-13 SWA1793 - Jul 13, 04:35 UTCJul 13, 05:35 UTC1h 0m
2026-07-13 SWA2786 - Jul 13, 02:30 UTCJul 13, 03:20 UTC50m
2026-07-13 SWA2786 SAT → ELP Jul 13, 02:25 UTCJul 13, 03:30 UTC1h 5m
2026-07-12 SWA4371 - Jul 12, 23:05 UTCJul 13, 01:15 UTC2h 10m
2026-07-12 SWA4371 BNA → SAT Jul 12, 23:06 UTCJul 13, 01:18 UTC2h 12m
2026-07-12 SWA1715 - Jul 12, 19:50 UTCJul 12, 21:45 UTC1h 55m
2026-07-12 SWA2725 - Jul 12, 16:15 UTCJul 12, 18:35 UTC2h 20m
2026-07-12 SWA2725 AUS → FLL Jul 12, 16:15 UTCJul 12, 18:34 UTC2h 19m
2026-07-12 SWA1474 DEN → AUS Jul 12, 13:30 UTCJul 12, 15:10 UTC1h 40m
2026-07-12 SWA2545 - Jul 12, 10:50 UTCJul 12, 12:05 UTC1h 15m
2026-07-12 SWA4257 DAL → MCI Jul 12, 02:05 UTCJul 12, 03:15 UTC1h 10m
2026-07-12 SWA4257 - Jul 12, 02:05 UTCJul 12, 03:15 UTC1h 10m
2026-07-11 SWA4682 - Jul 11, 22:55 UTCJul 12, 00:25 UTC1h 30m
2026-07-11 SWA2815 - Jul 11, 20:05 UTCJul 11, 21:50 UTC1h 45m
2026-07-11 SWA2815 MCI → VPS Jul 11, 20:03 UTCJul 11, 21:53 UTC1h 50m
2026-07-11 SWA2186 - Jul 11, 17:10 UTCJul 11, 18:50 UTC1h 40m
2026-07-11 SWA2186 ECP → MCI Jul 11, 17:05 UTCJul 11, 18:50 UTC1h 45m
2026-07-11 SWA397 - Jul 11, 14:15 UTCJul 11, 16:05 UTC1h 50m
2026-07-11 SWA576 - Jul 11, 10:30 UTCJul 11, 13:10 UTC2h 40m
2026-07-11 SWA2144 - Jul 11, 03:45 UTCJul 11, 05:25 UTC1h 40m
2026-07-11 SWA4425 - Jul 11, 01:15 UTCJul 11, 02:55 UTC1h 40m
2026-07-11 SWA2899 - Jul 11, 00:05 UTCJul 11, 00:25 UTC20m
2026-07-10 SWA2899 MDW → MCO Jul 10, 19:40 UTCJul 10, 22:45 UTC3h 5m
2026-07-10 SWA3469 RSW → MDW Jul 10, 16:15 UTCJul 10, 18:40 UTC2h 25m
2026-07-10 SWA1082 - Jul 10, 12:50 UTCJul 10, 15:05 UTC2h 15m
2026-07-10 SWA3735 SLC → BWI Jul 10, 05:40 UTCJul 10, 09:15 UTC3h 35m
2026-07-10 SWA4633 DAL → SLC Jul 10, 02:25 UTCJul 10, 04:40 UTC2h 15m
2026-07-10 SWA4633 DAL → SLC Jul 10, 02:21 UTCJul 10, 04:36 UTC2h 16m
2026-07-09 SWA4306 - Jul 9, 22:10 UTCJul 10, 01:05 UTC2h 55m
2026-07-09 SWA4306 LAX → DAL Jul 9, 22:09 UTCJul 10, 01:00 UTC2h 51m
2026-07-09 SWA3512 - Jul 9, 20:15 UTCJul 9, 21:15 UTC1h 0m
2026-07-09 SWA3512 RNO → LAX Jul 9, 20:11 UTCJul 9, 21:09 UTC59m
2026-07-09 SWA4954 - Jul 9, 17:55 UTCJul 9, 18:55 UTC1h 0m
2026-07-09 SWA4954 SAN → RNO Jul 9, 17:50 UTCJul 9, 18:59 UTC1h 9m
2026-07-09 SWA1699 - Jul 9, 14:45 UTCJul 9, 16:35 UTC1h 50m
2026-07-09 SWA2114 ATL → DEN Jul 9, 10:40 UTCJul 9, 13:20 UTC2h 40m
2026-07-09 SWA1472 - Jul 9, 03:35 UTCJul 9, 06:05 UTC2h 30m
2026-07-08 SWA968 - Jul 8, 23:50 UTCJul 9, 01:40 UTC1h 50m
2026-07-08 SWA901 - Jul 8, 18:35 UTCJul 8, 21:05 UTC2h 30m
2026-07-08 SWA2727 - Jul 8, 15:25 UTCJul 8, 17:25 UTC2h 0m
2026-07-08 SWA3288 - Jul 8, 11:25 UTCJul 8, 13:40 UTC2h 15m
2026-07-08 SWA4615 - Jul 8, 00:05 UTCJul 8, 01:35 UTC1h 30m
2026-07-07 SWA3142 - Jul 7, 18:45 UTCJul 7, 22:25 UTC3h 40m
2026-07-07 SWA3151 - Jul 7, 16:40 UTCJul 7, 17:35 UTC55m

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 N9001F page for operator, model, and routing details .

Mode-S AC71AD frequently asked

What is Mode-S code AC71AD?
AC71AD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9001F.
Where is Mode-S AC71AD registered?
Mode-S code AC71AD 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 AC71AD broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC71AD, octal 53070655, decimal 11,301,293.
What flights does AC71AD operate?
Mode-S AC71AD has broadcast 20 distinct callsigns, including SWA436, SWA4002, SWA2030, SWA1485, SWA958.