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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
Broadcasting now · callsign SWA1089 · 34,000 ft
Flights observed
542
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AC1A44 is currently broadcasting. Map zoomed to live position.

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
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
SWA675 Southwest Airlines 3 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA1089 - Jul 14, 02:45 UTCJul 14, 03:00 UTC15m
2026-07-13 SWA905 - Jul 13, 17:20 UTCJul 14, 00:30 UTC7h 10m
2026-07-13 SWA1941 - Jul 13, 02:35 UTCJul 13, 04:35 UTC2h 0m
2026-07-12 SWA1941 SLC → DEN Jul 12, 23:50 UTCJul 13, 01:10 UTC1h 20m
2026-07-12 SWA4322 - Jul 12, 19:40 UTCJul 12, 21:00 UTC1h 20m
2026-07-12 SWA4877 - Jul 12, 17:50 UTCJul 12, 18:45 UTC55m
2026-07-12 SWA3859 - Jul 12, 15:25 UTCJul 12, 16:15 UTC50m
2026-07-12 SWA3210 - Jul 12, 02:55 UTCJul 12, 04:01 UTC1h 5m
2026-07-11 SWA4994 - Jul 11, 21:15 UTCJul 12, 02:01 UTC4h 45m
2026-07-11 SWA2122 SJC → HNL Jul 11, 14:32 UTCJul 11, 19:34 UTC5h 2m
2026-07-11 SWA2122 - Jul 11, 14:35 UTCJul 11, 15:10 UTC35m
2026-07-11 SWA1670 PDX → SJC Jul 11, 06:05 UTCJul 11, 07:45 UTC1h 40m
2026-07-11 SWA1670 DEN → PDX Jul 11, 02:55 UTCJul 11, 05:10 UTC2h 15m
2026-07-10 SWA4024 - Jul 10, 22:30 UTCJul 11, 01:20 UTC2h 50m
2026-07-10 SWA4024 MEM → DEN Jul 10, 22:28 UTCJul 11, 01:17 UTC2h 50m
2026-07-10 SWA4024 - Jul 10, 19:40 UTCJul 10, 21:25 UTC1h 45m
2026-07-10 SWA2204 LAS → BWI Jul 10, 14:20 UTCJul 10, 18:20 UTC4h 0m
2026-07-10 SWA2514 - Jul 10, 06:25 UTCJul 10, 11:30 UTC5h 5m
2026-07-10 SWA3101 - Jul 10, 00:05 UTCJul 10, 00:25 UTC20m
2026-07-09 SWA1457 - Jul 9, 16:30 UTCJul 9, 17:30 UTC1h 0m
2026-07-09 SWA1457 LAS → OGG Jul 9, 16:30 UTCJul 9, 22:05 UTC5h 35m
2026-07-09 SWA139 - Jul 9, 10:40 UTCJul 9, 11:40 UTC1h 0m
2026-07-09 SWA2515 - Jul 9, 00:00 UTCJul 9, 00:20 UTC20m
2026-07-08 SWA2262 - Jul 8, 16:40 UTCJul 8, 17:55 UTC1h 15m
2026-07-08 SWA2262 LAS → LIH Jul 8, 16:40 UTCJul 8, 22:40 UTC6h 0m
2026-07-08 SWA4112 ANC → LAS Jul 8, 08:20 UTCJul 8, 12:50 UTC4h 30m
2026-07-08 SWA1575 DAL → LGA Jul 8, 02:05 UTCJul 8, 06:45 UTC4h 40m
2026-07-07 SWA975 - Jul 7, 20:25 UTCJul 8, 00:50 UTC4h 25m
2026-07-07 SWA2204 LAS → BWI Jul 7, 14:35 UTCJul 7, 18:45 UTC4h 10m
2026-07-07 SWA2204 LAS → BWI Jul 7, 14:31 UTCJul 7, 18:44 UTC4h 13m
2026-07-07 SWA139 - Jul 7, 11:05 UTCJul 7, 12:00 UTC55m
2026-07-07 SWA2172 KOA → OGG Jul 7, 00:00 UTCJul 7, 00:25 UTC25m
2026-07-07 SWA2172 - Jul 7, 00:00 UTCJul 7, 00:20 UTC20m
2026-07-06 SWA3783 - Jul 6, 21:55 UTCJul 6, 22:10 UTC15m
2026-07-06 SWA3783 - Jul 6, 17:15 UTCJul 6, 17:55 UTC40m
2026-07-06 SWA2359 LAS → SMF Jul 6, 14:35 UTCJul 6, 15:35 UTC1h 0m
2026-07-06 SWA1915 - Jul 6, 07:15 UTCJul 6, 12:20 UTC5h 5m
2026-07-05 SWA3274 - Jul 5, 22:40 UTCJul 5, 22:50 UTC10m
2026-07-05 SWA3274 - Jul 5, 16:45 UTCJul 5, 18:30 UTC1h 45m
2026-07-04 SWA1311 - Jul 4, 20:55 UTCJul 4, 21:50 UTC55m
2026-07-04 SWA2665 DEN → OAK Jul 4, 18:45 UTCJul 4, 19:45 UTC1h 0m
2026-07-04 SWA1303 LAS → SJC Jul 4, 16:55 UTCJul 4, 17:55 UTC1h 0m
2026-07-04 SWA2239 - Jul 4, 15:25 UTCJul 4, 16:05 UTC40m
2026-07-04 SWA2239 LAX → LAS Jul 4, 15:20 UTCJul 4, 16:03 UTC43m
2026-07-04 SWA136 - Jul 4, 13:45 UTCJul 4, 14:35 UTC50m
2026-07-04 SWA3542 SAN → SJC Jul 4, 04:10 UTCJul 4, 05:10 UTC1h 0m
2026-07-04 SWA3542 SAN → SJC Jul 4, 04:10 UTCJul 4, 05:09 UTC59m
2026-07-04 SWA4293 OAK → LAX Jul 4, 02:20 UTCJul 4, 03:25 UTC1h 5m
2026-07-04 SWA2316 - Jul 4, 00:00 UTCJul 4, 00:45 UTC45m
2026-07-03 SWA2316 - Jul 3, 20:00 UTCJul 3, 20:15 UTC15m

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?
Yes. Mode-S AC1A44 is currently airborne.
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.