Apparatus

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sensors Mode-S transponder

AC53D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8937Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC53D5
Octal
53051725
Decimal
11,293,653
Country
US
Tail
N8937Q
Type
B38M
No current signal · last broadcast 44m ago
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
44m ago

Last known position

Most recent position reported by Mode-S AC53D5.

Country allocation

The ICAO 24-bit address AC53D5 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
SWA3581 Southwest Airlines 7 2026-04-18
SWA249 Southwest Airlines 6 2026-06-02
SWA494 Southwest Airlines 4 2026-04-17
SWA4194 - 4 2026-04-13
SWA4172 - 4 2026-04-13
SWA4114 - 4 2026-04-13
SWA3953 - 4 2026-07-03
SWA3844 Southwest Airlines 4 2026-05-07
SWA3660 - 4 2026-06-26
SWA202 Southwest Airlines 4 2026-04-14
SWA1691 - 4 2026-06-19
SWA1422 - 4 2026-06-21
SWA976 Southwest Airlines 3 2026-06-06
SWA914 Southwest Airlines 3 2026-06-07
SWA699 Southwest Airlines 3 2026-05-29
SWA572 Southwest Airlines 3 2026-05-02
SWA509 Southwest Airlines 3 2026-05-16
SWA463 - 3 2026-06-23
SWA4231 Southwest Airlines 3 2026-04-17
SWA416 - 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SWA2371 LAS → STL Jul 15, 01:55 UTCJul 15, 04:50 UTC2h 55m
2026-07-14 SWA137 ABQ → LAS Jul 14, 23:50 UTCJul 15, 01:00 UTC1h 10m
2026-07-14 SWA137 ABQ → LAS Jul 14, 23:50 UTCJul 15, 00:54 UTC1h 4m
2026-07-14 SWA570 - Jul 14, 20:55 UTCJul 14, 22:55 UTC1h 59m
2026-07-14 SWA2398 GEG → OAK Jul 14, 17:40 UTCJul 14, 19:35 UTC1h 55m
2026-07-14 SWA2398 DEN → GEG Jul 14, 14:45 UTCJul 14, 16:30 UTC1h 45m
2026-07-14 SWA3737 SLC → DEN Jul 14, 12:10 UTCJul 14, 13:10 UTC1h 0m
2026-07-14 SWA1454 LAS → SLC Jul 14, 06:50 UTCJul 14, 07:50 UTC1h 0m
2026-07-14 SWA1454 LAS → SLC Jul 14, 06:49 UTCJul 14, 07:41 UTC52m
2026-07-14 SWA1454 - Jul 14, 04:55 UTCJul 14, 05:45 UTC50m
2026-07-14 SWA1703 DEN → SAN Jul 14, 02:05 UTCJul 14, 03:55 UTC1h 50m
2026-07-13 SWA3413 BUF → DEN Jul 13, 21:20 UTCJul 14, 00:00 UTC2h 40m
2026-07-13 SWA3413 BUF → DEN Jul 13, 21:17 UTCJul 13, 23:59 UTC2h 42m
2026-07-13 SWA4728 - Jul 13, 18:50 UTCJul 13, 20:15 UTC1h 25m
2026-07-13 SWA4423 - Jul 13, 16:00 UTCJul 13, 17:40 UTC1h 40m
2026-07-13 SWA1106 - Jul 13, 12:35 UTCJul 13, 14:40 UTC2h 5m
2026-07-13 SWA3486 - Jul 13, 05:20 UTCJul 13, 10:05 UTC4h 45m
2026-07-13 SWA3486 SAN → BWI Jul 13, 05:19 UTCJul 13, 10:05 UTC4h 46m
2026-07-13 SWA3509 SMF → SAN Jul 13, 02:55 UTCJul 13, 04:10 UTC1h 15m
2026-07-12 SWA1625 LAS → SMF Jul 12, 23:40 UTCJul 13, 00:40 UTC1h 0m
2026-07-12 SWA2809 PDX → LAS Jul 12, 20:10 UTCJul 12, 22:10 UTC2h 0m
2026-07-12 SWA2809 - Jul 12, 15:10 UTCJul 12, 18:55 UTC3h 45m
2026-07-12 SWA3531 PHL → MDW Jul 12, 12:10 UTCJul 12, 13:50 UTC1h 40m
2026-07-11 SWA4263 - Jul 11, 23:40 UTCJul 12, 01:10 UTC1h 30m
2026-07-11 SWA1524 - Jul 11, 20:50 UTCJul 11, 21:40 UTC50m
2026-07-11 SWA1524 - Jul 11, 18:35 UTCJul 11, 19:45 UTC1h 10m
2026-07-11 SWA3677 RSW → DEN Jul 11, 13:50 UTCJul 11, 17:15 UTC3h 25m
2026-07-11 SWA4151 MDW → RSW Jul 11, 10:20 UTCJul 11, 12:45 UTC2h 25m
2026-07-11 SWA1251 CVG → MDW Jul 11, 01:11 UTCJul 11, 02:01 UTC51m
2026-07-10 SWA1251 - Jul 10, 22:00 UTCJul 11, 00:20 UTC2h 20m
2026-07-10 SWA3069 - Jul 10, 18:45 UTCJul 10, 20:40 UTC1h 55m
2026-07-10 SWA956 - Jul 10, 14:40 UTCJul 10, 17:25 UTC2h 45m
2026-07-10 SWA2985 MSY → BWI Jul 10, 11:05 UTCJul 10, 13:15 UTC2h 10m
2026-07-10 SWA3964 - Jul 10, 04:05 UTCJul 10, 06:00 UTC1h 55m
2026-07-10 SWA3457 RDU → STL Jul 10, 01:15 UTCJul 10, 03:15 UTC2h 0m
2026-07-09 SWA1389 DAL → RDU Jul 9, 22:00 UTCJul 10, 00:15 UTC2h 15m
2026-07-09 SWA4819 FXE → DAL Jul 9, 17:40 UTCJul 9, 20:05 UTC2h 25m
2026-07-09 SWA4819 FLL → DAL Jul 9, 17:35 UTCJul 9, 20:00 UTC2h 25m
2026-07-09 SWA4785 - Jul 9, 14:05 UTCJul 9, 16:20 UTC2h 15m
2026-07-09 SWA4785 BWI → FLL Jul 9, 14:02 UTCJul 9, 16:16 UTC2h 14m
2026-07-09 SWA3876 - Jul 9, 10:55 UTCJul 9, 13:00 UTC2h 5m
2026-07-09 SWA4615 BNA → SRQ Jul 9, 01:15 UTCJul 9, 03:00 UTC1h 45m
2026-07-08 SWA3142 POC → BNA Jul 8, 18:50 UTCJul 8, 22:25 UTC3h 35m
2026-07-08 SWA3142 ONT → BNA Jul 8, 18:47 UTCJul 8, 22:26 UTC3h 39m
2026-07-08 SWA3151 RHV → ONT Jul 8, 16:45 UTCJul 8, 17:35 UTC50m
2026-07-08 SWA398 AUS → SJC Jul 8, 12:40 UTCJul 8, 15:45 UTC3h 5m
2026-07-08 SWA3425 - Jul 8, 00:35 UTCJul 8, 03:30 UTC2h 55m
2026-07-07 SWA3425 RDU → BWI Jul 7, 22:35 UTCJul 7, 23:20 UTC45m
2026-07-07 SWA3214 PVD → BWI Jul 7, 17:45 UTCJul 7, 21:35 UTC3h 50m
2026-07-07 SWA1146 - Jul 7, 15:15 UTCJul 7, 16:05 UTC50m

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 N8937Q page for operator, model, and routing details .

Mode-S AC53D5 frequently asked

What is Mode-S code AC53D5?
AC53D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8937Q.
Where is Mode-S AC53D5 registered?
Mode-S code AC53D5 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 AC53D5 broadcasting right now?
No active broadcast right now. Last signal was 44m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC53D5, octal 53051725, decimal 11,293,653.
What flights does AC53D5 operate?
Mode-S AC53D5 has broadcast 20 distinct callsigns, including SWA3581, SWA249, SWA494, SWA4194, SWA4172.