Apparatus

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sensors Mode-S transponder

AC57D2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8949Q · operated by SOUTHWEST AIRLINES CO

Hex
AC57D2
Octal
53053722
Decimal
11,294,674
Country
US
Tail
N8949Q
Type
B38M
Broadcasting now · callsign SWA1050 · 36,000 ft
Flights observed
685
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

AC57D2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC57D2 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
SWA1718 Southwest Airlines 5 2026-05-22
SWA737 Southwest Airlines 4 2026-04-15
SWA639 Southwest Airlines 4 2026-07-02
SWA426 - 4 2026-06-29
SWA4011 - 4 2026-07-03
SWA3384 - 4 2026-07-05
SWA2684 Southwest Airlines 4 2026-06-16
SWA2050 Southwest Airlines 4 2026-04-16
SWA175 Southwest Airlines 4 2026-05-30
SWA1644 Southwest Airlines 4 2026-04-21
SWA1603 Southwest Airlines 4 2026-04-14
SWA1109 Southwest Airlines 4 2026-05-26
SWA982 Southwest Airlines 3 2026-05-26
SWA888 Southwest Airlines 3 2026-05-02
SWA678 Southwest Airlines 3 2026-05-27
SWA483 - 3 2026-07-06
SWA4677 Southwest Airlines 3 2026-06-22
SWA4609 - 3 2026-06-29
SWA459 Southwest Airlines 3 2026-05-19
SWA4361 Southwest Airlines 3 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA331 - Jul 14, 17:20 UTCJul 14, 18:05 UTC45m
2026-07-14 SWA279 BWI → BUF Jul 14, 15:25 UTCJul 14, 16:15 UTC50m
2026-07-14 SWA279 BWI → BUF Jul 14, 15:25 UTCJul 14, 16:13 UTC48m
2026-07-14 SWA3402 - Jul 14, 13:00 UTCJul 14, 14:00 UTC1h 0m
2026-07-14 SWA4821 - Jul 14, 10:55 UTCJul 14, 11:50 UTC55m
2026-07-14 SWA1500 DEN → BWI Jul 14, 01:50 UTCJul 14, 05:00 UTC3h 10m
2026-07-13 SWA2769 - Jul 13, 22:00 UTCJul 13, 23:55 UTC1h 55m
2026-07-13 SWA3449 - Jul 13, 17:15 UTCJul 13, 20:40 UTC3h 25m
2026-07-13 SWA3449 RNO → MDW Jul 13, 17:11 UTCJul 13, 20:31 UTC3h 21m
2026-07-13 SWA2689 - Jul 13, 14:15 UTCJul 13, 15:30 UTC1h 15m
2026-07-13 SWA1970 - Jul 13, 10:40 UTCJul 13, 12:40 UTC2h 0m
2026-07-13 SWA4474 - Jul 13, 04:35 UTCJul 13, 06:10 UTC1h 35m
2026-07-13 SWA4474 BNA → HOU Jul 13, 04:34 UTCJul 13, 06:15 UTC1h 41m
2026-07-13 SWA1689 - Jul 13, 01:30 UTCJul 13, 03:40 UTC2h 10m
2026-07-13 SWA1689 MIA → BNA Jul 13, 01:28 UTCJul 13, 03:33 UTC2h 5m
2026-07-12 SWA3405 STL → MIA Jul 12, 21:35 UTCJul 12, 23:55 UTC2h 20m
2026-07-12 SWA3405 STL → MIA Jul 12, 21:31 UTCJul 12, 23:46 UTC2h 15m
2026-07-12 SWA1749 - Jul 12, 19:10 UTCJul 12, 20:15 UTC1h 5m
2026-07-12 SWA1749 DTW → STL Jul 12, 19:05 UTCJul 12, 20:12 UTC1h 7m
2026-07-12 SWA2808 - Jul 12, 16:40 UTCJul 12, 17:45 UTC1h 5m
2026-07-12 SWA652 LGA → STL Jul 12, 13:20 UTCJul 12, 15:20 UTC2h 0m
2026-07-12 SWA2801 - Jul 12, 10:35 UTCJul 12, 12:10 UTC1h 35m
2026-07-12 SWA2801 MDW → LGA Jul 12, 10:33 UTCJul 12, 12:12 UTC1h 39m
2026-07-12 SWA1189 DAL → MDW Jul 12, 02:15 UTCJul 12, 04:15 UTC2h 0m
2026-07-12 SWA1189 DAL → MDW Jul 12, 02:12 UTCJul 12, 04:08 UTC1h 56m
2026-07-11 SWA1404 SEA → DAL Jul 11, 21:35 UTCJul 12, 00:55 UTC3h 20m
2026-07-11 SWA4130 DEN → SEA Jul 11, 17:38 UTCJul 11, 20:02 UTC2h 25m
2026-07-11 SWA4130 DEN → SEA Jul 11, 17:40 UTCJul 11, 20:00 UTC2h 20m
2026-07-11 SWA4130 - Jul 11, 14:35 UTCJul 11, 16:25 UTC1h 50m
2026-07-11 SWA1548 - Jul 11, 12:45 UTCJul 11, 13:25 UTC40m
2026-07-11 SWA1548 TPA → DAL Jul 11, 09:45 UTCJul 11, 11:45 UTC2h 0m
2026-07-11 SWA4980 - Jul 11, 00:20 UTCJul 11, 02:20 UTC2h 0m
2026-07-10 SWA2074 - Jul 10, 22:05 UTCJul 10, 22:45 UTC40m
2026-07-10 SWA2074 HOU → SAT Jul 10, 22:04 UTCJul 10, 22:43 UTC39m
2026-07-10 SWA1543 - Jul 10, 19:00 UTCJul 10, 21:00 UTC2h 0m
2026-07-10 SWA2118 - Jul 10, 13:50 UTCJul 10, 16:05 UTC2h 15m
2026-07-10 SWA2642 MCO → IND Jul 10, 10:50 UTCJul 10, 12:50 UTC2h 0m
2026-07-10 SWA2642 MCO → IND Jul 10, 10:48 UTCJul 10, 12:48 UTC2h 0m
2026-07-10 SWA1729 - Jul 10, 00:30 UTCJul 10, 03:05 UTC2h 35m
2026-07-09 SWA2705 - Jul 9, 22:45 UTCJul 9, 23:10 UTC25m
2026-07-09 SWA2705 - Jul 9, 20:35 UTCJul 9, 21:10 UTC35m
2026-07-09 SWA3238 - Jul 9, 17:05 UTCJul 9, 19:20 UTC2h 15m
2026-07-09 SWA989 - Jul 9, 13:20 UTCJul 9, 15:40 UTC2h 20m
2026-07-09 SWA4358 STL → MCO Jul 9, 10:20 UTCJul 9, 12:15 UTC1h 55m
2026-07-09 SWA4358 STL → MCO Jul 9, 10:16 UTCJul 9, 12:10 UTC1h 54m
2026-07-09 SWA1414 DAL → STL Jul 9, 03:20 UTCJul 9, 04:35 UTC1h 15m
2026-07-08 SWA3218 - Jul 8, 22:35 UTCJul 9, 01:45 UTC3h 10m
2026-07-08 SWA2034 - Jul 8, 19:25 UTCJul 8, 21:30 UTC2h 5m
2026-07-08 SWA2034 - Jul 8, 15:45 UTCJul 8, 17:40 UTC1h 55m
2026-07-08 SWA204 - Jul 8, 12:45 UTCJul 8, 14:30 UTC1h 45m

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 N8949Q page for operator, model, and routing details .

Mode-S AC57D2 frequently asked

What is Mode-S code AC57D2?
AC57D2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8949Q.
Where is Mode-S AC57D2 registered?
Mode-S code AC57D2 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 AC57D2 broadcasting right now?
Yes. Mode-S AC57D2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC57D2, octal 53053722, decimal 11,294,674.
What flights does AC57D2 operate?
Mode-S AC57D2 has broadcast 20 distinct callsigns, including SWA1718, SWA737, SWA639, SWA426, SWA4011.