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 SWA3866 · 37,500 ft
Flights observed
778
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

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
SWA1050 - 6 2026-07-15
SWA1718 Southwest Airlines 5 2026-05-22
SWA737 Southwest Airlines 4 2026-04-15
SWA639 Southwest Airlines 4 2026-07-02
SWA463 Southwest Airlines 4 2026-07-21
SWA426 - 4 2026-06-29
SWA4011 - 4 2026-07-03
SWA343 Southwest Airlines 4 2026-07-20
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
SWA1560 - 4 2026-07-18
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1477 SNA → SJC Jul 26, 19:35 UTCJul 26, 21:20 UTC1h 45m
2026-07-26 SWA1972 DAL → LAX Jul 26, 16:15 UTCJul 26, 18:10 UTC1h 55m
2026-07-26 SWA1972 DAL → LAX Jul 26, 16:10 UTCJul 26, 18:01 UTC1h 51m
2026-07-26 SWA4557 LBB → DAL Jul 26, 11:40 UTCJul 26, 14:15 UTC2h 35m
2026-07-26 SWA4161 CLE → TPA Jul 26, 05:00 UTCJul 26, 05:55 UTC55m
2026-07-26 SWA4161 CLE → TPA Jul 26, 04:57 UTCJul 26, 05:49 UTC52m
2026-07-26 SWA4753 BUR → SJC Jul 26, 00:45 UTCJul 26, 04:05 UTC3h 20m
2026-07-25 SWA962 TPA → BDL Jul 25, 22:15 UTCJul 25, 23:30 UTC1h 15m
2026-07-25 SWA2687 PVD → MCO Jul 25, 18:15 UTCJul 25, 21:05 UTC2h 50m
2026-07-25 SWA2687 PVD → MCO Jul 25, 18:11 UTCJul 25, 21:05 UTC2h 54m
2026-07-25 SWA3240 MCO → MSY Jul 25, 14:45 UTCJul 25, 16:50 UTC2h 5m
2026-07-25 SWA4508 BWI → FLL Jul 25, 06:20 UTCJul 25, 10:05 UTC3h 45m
2026-07-25 SWA4508 BWI → FLL Jul 25, 06:18 UTCJul 25, 10:02 UTC3h 44m
2026-07-25 SWA2494 BUR → SFO Jul 25, 03:45 UTCJul 25, 04:50 UTC1h 5m
2026-07-25 SWA1336 CVG → BWI Jul 25, 00:15 UTCJul 25, 02:50 UTC2h 35m
2026-07-25 SWA1336 CVG → BWI Jul 25, 00:11 UTCJul 25, 02:44 UTC2h 33m
2026-07-24 SWA3256 BWI → MHT Jul 24, 20:55 UTCJul 24, 23:05 UTC2h 10m
2026-07-24 SWA2063 SAN → OAK Jul 24, 17:20 UTCJul 24, 19:25 UTC2h 5m
2026-07-24 SWA2215 CLE → DEN Jul 24, 13:55 UTCJul 24, 15:50 UTC1h 55m
2026-07-24 SWA3930 BWI → PVD Jul 24, 09:45 UTCJul 24, 12:25 UTC2h 40m
2026-07-24 SWA909 LGA → ATL Jul 24, 03:00 UTCJul 24, 03:55 UTC55m
2026-07-24 SWA2745 STL → CLE Jul 24, 00:35 UTCJul 24, 01:50 UTC1h 15m
2026-07-23 SWA1539 BWI → PVD Jul 23, 22:45 UTCJul 23, 23:20 UTC35m
2026-07-23 SWA1539 BWI → PVD Jul 23, 22:40 UTCJul 23, 23:18 UTC38m
2026-07-23 SWA1539 BWI → PVD Jul 23, 19:30 UTCJul 23, 21:30 UTC2h 0m
2026-07-23 SWA3369 SFO → LAS Jul 23, 15:15 UTCJul 23, 18:10 UTC2h 55m
2026-07-23 SWA846 - Jul 23, 12:50 UTCJul 23, 13:45 UTC55m
2026-07-23 SWA442 BWI → BOS Jul 23, 10:15 UTCJul 23, 11:45 UTC1h 30m
2026-07-23 SWA442 BWI → BOS Jul 23, 10:12 UTCJul 23, 11:43 UTC1h 31m
2026-07-23 SWA1347 MDW → TPA Jul 23, 03:55 UTCJul 23, 05:15 UTC1h 20m
2026-07-23 SWA1347 MDW → TPA Jul 23, 00:05 UTCJul 23, 02:10 UTC2h 5m
2026-07-22 SWA3017 ORD → DAL Jul 22, 20:15 UTCJul 22, 22:55 UTC2h 40m
2026-07-22 SWA2295 BUR → SJC Jul 22, 15:50 UTCJul 22, 19:05 UTC3h 15m
2026-07-22 SWA4699 OAK → SAN Jul 22, 13:30 UTCJul 22, 14:40 UTC1h 10m
2026-07-22 SWA2425 IND → MCO Jul 22, 03:30 UTCJul 22, 05:25 UTC1h 55m
2026-07-21 SWA1272 TPA → OMA Jul 21, 22:15 UTCJul 22, 01:30 UTC3h 15m
2026-07-21 SWA463 SJC → BUR Jul 21, 17:05 UTCJul 21, 18:30 UTC1h 25m
2026-07-21 SWA463 SJC → BUR Jul 21, 17:00 UTCJul 21, 18:40 UTC1h 41m
2026-07-21 SWA463 SJC → BUR Jul 21, 15:20 UTCJul 21, 16:05 UTC45m
2026-07-21 SWA2764 TUL → DAL Jul 21, 12:30 UTCJul 21, 14:05 UTC1h 35m
2026-07-21 SWA3799 MDW → CMH Jul 21, 05:20 UTCJul 21, 10:15 UTC4h 55m
2026-07-21 SWA3757 DAL → MSY Jul 21, 02:45 UTCJul 21, 04:00 UTC1h 15m
2026-07-21 SWA1734 HOU → LGA Jul 21, 00:40 UTCJul 21, 02:00 UTC1h 20m
2026-07-20 SWA938 MDW → BOS Jul 20, 19:55 UTCJul 20, 23:05 UTC3h 10m
2026-07-20 SWA3718 - Jul 20, 14:50 UTCJul 20, 15:00 UTC10m
2026-07-20 SWA3718 DEN → OAK Jul 20, 14:45 UTCJul 20, 18:20 UTC3h 35m
2026-07-20 SWA343 SJC → SAN Jul 20, 13:20 UTCJul 20, 13:35 UTC15m
2026-07-20 SWA343 SJC → SAN Jul 20, 11:00 UTCJul 20, 11:45 UTC45m
2026-07-20 SWA2441 - Jul 20, 01:05 UTCJul 20, 05:30 UTC4h 25m
2026-07-19 SWA1570 IAH → LAS Jul 19, 21:45 UTCJul 19, 23:40 UTC1h 55m

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 SWA1050, SWA1718, SWA737, SWA639, SWA463.