Apparatus

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sensors Mode-S transponder

AC1A44

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8791D · operated by SOUTHWEST AIRLINES CO

Hex
AC1A44
Octal
53015104
Decimal
11,278,916
Country
US
Tail
N8791D
Type
B38M
No current signal · last broadcast Jul 26, 22:10 UTC
Flights observed
629
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:10 UTC

Last known position

Most recent position reported by Mode-S AC1A44.

Country allocation

The ICAO 24-bit address AC1A44 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
SWA1597 Southwest Airlines 6 2026-06-03
SWA4238 Southwest Airlines 5 2026-05-13
SWA4074 Southwest Airlines 5 2026-05-02
SWA3547 Southwest Airlines 5 2026-04-18
SWA3274 - 5 2026-07-05
SWA3089 - 5 2026-06-23
SWA2261 Southwest Airlines 5 2026-05-02
SWA1457 - 5 2026-07-09
SWA649 - 4 2026-06-27
SWA4825 Southwest Airlines 4 2026-06-19
SWA3977 Southwest Airlines 4 2026-06-06
SWA396 - 4 2026-06-19
SWA3783 - 4 2026-07-06
SWA2520 Southwest Airlines 4 2026-05-01
SWA2252 Southwest Airlines 4 2026-06-01
SWA2138 Southwest Airlines 4 2026-07-19
SWA1942 - 4 2026-06-26
SWA941 Southwest Airlines 3 2026-04-27
SWA930 Southwest Airlines 3 2026-06-12
SWA808 Southwest Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4613 IND → DEN Jul 26, 21:55 UTCJul 26, 22:10 UTC15m
2026-07-26 SWA4998 STL → BOS Jul 26, 17:45 UTCJul 26, 20:15 UTC2h 30m
2026-07-26 SWA1102 EUG → OAK Jul 26, 14:25 UTCJul 26, 16:25 UTC2h 0m
2026-07-26 SWA1102 EUG → OAK Jul 26, 11:20 UTCJul 26, 13:10 UTC1h 50m
2026-07-26 SWA133 ALB → BWI Jul 26, 02:45 UTCJul 26, 03:30 UTC45m
2026-07-25 SWA3719 DEN → MDW Jul 25, 23:35 UTCJul 26, 01:30 UTC1h 55m
2026-07-25 SWA3719 DEN → MDW Jul 25, 21:55 UTCJul 25, 22:05 UTC10m
2026-07-25 SWA682 SEA → SJC Jul 25, 20:10 UTCJul 25, 20:35 UTC25m
2026-07-25 SWA682 SEA → SJC Jul 25, 17:00 UTCJul 25, 18:35 UTC1h 35m
2026-07-25 SWA682 SEA → SJC Jul 25, 16:58 UTCJul 25, 20:30 UTC3h 32m
2026-07-25 SWA2107 SJC → BUR Jul 25, 13:59 UTCJul 25, 15:43 UTC1h 44m
2026-07-25 SWA2107 SJC → BUR Jul 25, 14:00 UTCJul 25, 15:45 UTC1h 45m
2026-07-25 SWA4939 HOU → MDW Jul 25, 10:15 UTCJul 25, 12:15 UTC2h 0m
2026-07-25 SWA4939 HOU → MDW Jul 25, 10:13 UTCJul 25, 12:17 UTC2h 4m
2026-07-25 SWA3354 MSY → MDW Jul 25, 05:15 UTCJul 25, 08:05 UTC2h 50m
2026-07-25 SWA3354 MSY → MDW Jul 25, 01:30 UTCJul 25, 04:05 UTC2h 35m
2026-07-24 SWA393 SNA → DEN Jul 24, 20:00 UTCJul 24, 23:35 UTC3h 35m
2026-07-24 SWA393 SNA → DEN Jul 24, 20:05 UTCJul 24, 23:50 UTC3h 45m
2026-07-24 SWA450 ISP → BWI Jul 24, 16:50 UTCJul 24, 18:35 UTC1h 45m
2026-07-24 SWA450 ISP → BWI Jul 24, 16:49 UTCJul 24, 18:32 UTC1h 43m
2026-07-24 SWA4638 SJC → LAX Jul 24, 13:50 UTCJul 24, 15:35 UTC1h 45m
2026-07-24 SWA4638 SJC → LAX Jul 24, 13:45 UTCJul 24, 15:33 UTC1h 48m
2026-07-24 SWA4627 PIT → TPA Jul 24, 10:25 UTCJul 24, 12:35 UTC2h 10m
2026-07-23 SWA1805 AUA → BWI Jul 23, 20:00 UTCJul 24, 00:00 UTC4h 0m
2026-07-23 SWA1443 BNA → LGA Jul 23, 15:55 UTCJul 23, 18:40 UTC2h 45m
2026-07-23 SWA3728 DCA → DAL Jul 23, 03:45 UTCJul 23, 04:25 UTC40m
2026-07-23 SWA3728 DCA → DAL Jul 23, 02:00 UTCJul 23, 02:15 UTC15m
2026-07-23 SWA3728 DCA → DAL Jul 23, 01:59 UTCJul 23, 04:21 UTC2h 23m
2026-07-23 SWA1103 OAK → MDW Jul 23, 00:35 UTCJul 23, 00:50 UTC15m
2026-07-22 SWA1103 OAK → MDW Jul 22, 20:50 UTCJul 22, 22:45 UTC1h 55m
2026-07-22 SWA1345 BNA → BWI Jul 22, 17:45 UTCJul 22, 19:00 UTC1h 15m
2026-07-22 SWA3734 STL → BNA Jul 22, 15:45 UTCJul 22, 16:30 UTC45m
2026-07-22 SWA3734 STL → BNA Jul 22, 15:41 UTCJul 22, 16:22 UTC41m
2026-07-22 SWA3662 DEN → PHL Jul 22, 12:50 UTCJul 22, 14:25 UTC1h 35m
2026-07-22 SWA3662 DEN → PHL Jul 22, 12:46 UTCJul 22, 14:19 UTC1h 33m
2026-07-22 SWA4023 LAS → RNO Jul 22, 10:20 UTCJul 22, 11:40 UTC1h 20m
2026-07-22 SWA2090 BNA → DAL Jul 22, 00:50 UTCJul 22, 02:45 UTC1h 55m
2026-07-21 SWA817 LIR → HOU Jul 21, 20:22 UTCJul 21, 23:08 UTC2h 46m
2026-07-21 SWA691 - Jul 21, 16:10 UTCJul 21, 23:10 UTC7h 0m
2026-07-21 SWA4021 BWI → BOS Jul 21, 12:29 UTCJul 21, 14:34 UTC2h 5m
2026-07-21 SWA4021 BWI → BOS Jul 21, 12:30 UTCJul 21, 14:40 UTC2h 10m
2026-07-21 SWA2770 SJC → SLC Jul 21, 03:10 UTCJul 21, 05:30 UTC2h 20m
2026-07-21 SWA2770 SJC → SLC Jul 21, 03:07 UTCJul 21, 05:22 UTC2h 15m
2026-07-21 SWA1200 SJC → PDX Jul 21, 01:10 UTCJul 21, 02:05 UTC55m
2026-07-20 SWA1963 DAL → DEN Jul 20, 21:20 UTCJul 20, 23:35 UTC2h 15m
2026-07-20 SWA3673 - Jul 20, 16:40 UTCJul 20, 20:05 UTC3h 25m
2026-07-20 SWA1160 - Jul 20, 14:25 UTCJul 20, 15:25 UTC1h 0m
2026-07-20 SWA2514 SJC → ONT Jul 20, 06:35 UTCJul 20, 11:45 UTC5h 10m
2026-07-20 SWA3101 - Jul 20, 02:00 UTCJul 20, 02:20 UTC20m
2026-07-19 SWA2138 BNA → PHL Jul 19, 18:35 UTCJul 19, 19:50 UTC1h 15m

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 N8791D page for operator, model, and routing details .

Mode-S AC1A44 frequently asked

What is Mode-S code AC1A44?
AC1A44 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8791D.
Where is Mode-S AC1A44 registered?
Mode-S code AC1A44 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 AC1A44 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC1A44, octal 53015104, decimal 11,278,916.
What flights does AC1A44 operate?
Mode-S AC1A44 has broadcast 20 distinct callsigns, including SWA1597, SWA4238, SWA4074, SWA3547, SWA3274.