Apparatus

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sensors Mode-S transponder

AC12D6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8771D · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC12D6
Octal
53011326
Decimal
11,277,014
Country
US
Tail
N8771D
Type
B38M
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
709
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AC12D6.

Country allocation

The ICAO 24-bit address AC12D6 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
SWA1995 - 8 2026-07-07
SWA3290 Southwest Airlines 7 2026-04-29
SWA2104 - 6 2026-07-15
SWA510 Southwest Airlines 4 2026-04-17
SWA4136 - 4 2026-06-26
SWA3919 Southwest Airlines 4 2026-07-26
SWA3150 - 4 2026-06-23
SWA2848 Southwest Airlines 4 2026-05-08
SWA2664 Southwest Airlines 4 2026-05-19
SWA219 - 4 2026-06-20
SWA2032 Southwest Airlines 4 2026-06-03
SWA1607 - 4 2026-07-16
SWA1255 - 4 2026-07-04
SWA112 - 4 2026-07-11
SWA905 - 3 2026-07-02
SWA708 Southwest Airlines 3 2026-06-01
SWA7 - 3 2026-06-19
SWA691 Southwest Airlines 3 2026-06-07
SWA4671 - 3 2026-07-10
SWA454 - 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1126 MDW → FLL Jul 26, 15:40 UTCJul 26, 21:30 UTC5h 50m
2026-07-26 SWA3919 MDW → STL Jul 26, 11:40 UTCJul 26, 13:15 UTC1h 35m
2026-07-26 SWA3919 MDW → STL Jul 26, 11:39 UTCJul 26, 13:15 UTC1h 36m
2026-07-26 SWA142 BUR → OAK Jul 26, 02:20 UTCJul 26, 04:20 UTC2h 0m
2026-07-25 SWA2035 DAL → TUL Jul 25, 22:50 UTCJul 26, 00:50 UTC2h 0m
2026-07-25 SWA567 LIR → HOU Jul 25, 13:50 UTCJul 25, 20:50 UTC7h 0m
2026-07-25 SWA4392 SJC → PHX Jul 25, 11:05 UTCJul 25, 11:35 UTC30m
2026-07-25 SWA296 BNA → LGA Jul 25, 02:50 UTCJul 25, 07:05 UTC4h 15m
2026-07-24 SWA2254 BNA → LGA Jul 24, 23:45 UTCJul 25, 01:35 UTC1h 50m
2026-07-24 SWA4129 TPA → BWI Jul 24, 20:45 UTCJul 24, 22:40 UTC1h 55m
2026-07-24 SWA4129 TPA → BWI Jul 24, 20:42 UTCJul 24, 22:34 UTC1h 52m
2026-07-24 SWA2757 BWI → PWM Jul 24, 17:45 UTCJul 24, 19:30 UTC1h 45m
2026-07-24 SWA2757 BWI → PWM Jul 24, 17:42 UTCJul 24, 19:29 UTC1h 47m
2026-07-24 SWA4037 PHX → OAK Jul 24, 13:20 UTCJul 24, 15:35 UTC2h 15m
2026-07-24 SWA4037 PHX → OAK Jul 24, 13:16 UTCJul 24, 15:31 UTC2h 15m
2026-07-24 SWA4483 SJC → BUR Jul 24, 10:15 UTCJul 24, 12:15 UTC2h 0m
2026-07-24 SWA4483 SJC → BUR Jul 24, 10:10 UTCJul 24, 12:09 UTC1h 59m
2026-07-23 SWA4244 STL → TPA Jul 23, 21:37 UTCJul 24, 01:08 UTC3h 31m
2026-07-23 SWA4244 STL → TPA Jul 23, 21:40 UTCJul 24, 01:05 UTC3h 25m
2026-07-23 SWA2336 DEN → SFO Jul 23, 18:35 UTCJul 23, 19:20 UTC45m
2026-07-23 SWA2336 DEN → SFO Jul 23, 16:50 UTCJul 23, 17:40 UTC50m
2026-07-23 SWA2336 DEN → SFO Jul 23, 14:40 UTCJul 23, 15:20 UTC40m
2026-07-23 SWA864 BWI → MHT Jul 23, 12:40 UTCJul 23, 13:30 UTC50m
2026-07-23 SWA457 SJC → LAX Jul 23, 07:45 UTCJul 23, 08:40 UTC55m
2026-07-23 SWA3865 ATL → CMH Jul 23, 05:50 UTCJul 23, 06:45 UTC55m
2026-07-23 SWA296 BNA → LGA Jul 23, 01:50 UTCJul 23, 04:15 UTC2h 25m
2026-07-22 SWA2320 OAK → LAS Jul 22, 22:25 UTCJul 23, 00:30 UTC2h 5m
2026-07-22 SWA2320 OAK → LAS Jul 22, 22:20 UTCJul 23, 00:29 UTC2h 9m
2026-07-22 SWA336 BUR → SJC Jul 22, 19:03 UTCJul 22, 21:05 UTC2h 2m
2026-07-22 SWA336 BUR → SJC Jul 22, 19:05 UTCJul 22, 21:10 UTC2h 5m
2026-07-22 SWA1250 LIT → STL Jul 22, 14:30 UTCJul 22, 17:15 UTC2h 45m
2026-07-22 SWA4082 - Jul 22, 11:15 UTCJul 22, 11:55 UTC40m
2026-07-21 SWA3094 OAK → LAX Jul 21, 22:20 UTCJul 21, 22:45 UTC25m
2026-07-21 SWA3094 OAK → LAX Jul 21, 22:15 UTCJul 21, 22:40 UTC25m
2026-07-21 SWA649 DAL → MCI Jul 21, 15:27 UTCJul 21, 20:43 UTC5h 16m
2026-07-21 SWA649 DAL → MCI Jul 21, 15:30 UTCJul 21, 16:15 UTC45m
2026-07-21 SWA3873 MDW → CHS Jul 21, 03:55 UTCJul 21, 05:00 UTC1h 5m
2026-07-21 SWA3873 MDW → CHS Jul 21, 03:50 UTCJul 21, 04:51 UTC1h 1m
2026-07-21 SWA3089 - Jul 21, 01:45 UTCJul 21, 02:50 UTC1h 5m
2026-07-20 SWA3089 - Jul 20, 23:50 UTCJul 21, 00:40 UTC50m
2026-07-20 SWA1927 DCA → MSY Jul 20, 16:15 UTCJul 20, 16:30 UTC15m
2026-07-20 SWA2329 - Jul 20, 02:10 UTCJul 20, 02:50 UTC40m
2026-07-20 SWA2329 SAN → HNL Jul 20, 02:10 UTCJul 20, 07:36 UTC5h 26m
2026-07-19 SWA3017 - Jul 19, 23:55 UTCJul 20, 00:40 UTC45m
2026-07-19 SWA3017 - Jul 19, 22:00 UTCJul 19, 22:50 UTC50m
2026-07-19 SWA4881 AUS → ABQ Jul 19, 19:15 UTCJul 19, 20:40 UTC1h 25m
2026-07-19 SWA4856 PHX → AUS Jul 19, 14:40 UTCJul 19, 17:45 UTC3h 5m
2026-07-19 SWA2277 - Jul 19, 07:25 UTCJul 19, 12:55 UTC5h 30m
2026-07-18 SWA3274 PHX → HNL Jul 18, 16:57 UTCJul 18, 23:02 UTC6h 5m
2026-07-18 SWA3274 - Jul 18, 17:00 UTCJul 18, 23:00 UTC6h 0m

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 N8771D page for operator, model, and routing details .

Mode-S AC12D6 frequently asked

What is Mode-S code AC12D6?
AC12D6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8771D.
Where is Mode-S AC12D6 registered?
Mode-S code AC12D6 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 AC12D6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC12D6, octal 53011326, decimal 11,277,014.
What flights does AC12D6 operate?
Mode-S AC12D6 has broadcast 20 distinct callsigns, including SWA1995, SWA3290, SWA2104, SWA510, SWA4136.