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 Jul 26, 20:15 UTC
Flights observed
739
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:15 UTC

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
SWA1599 Southwest Airlines 5 2026-07-25
SWA494 Southwest Airlines 4 2026-04-17
SWA4537 Southwest Airlines 4 2026-07-23
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
SWA3142 Southwest Airlines 4 2026-07-24
SWA2258 Southwest Airlines 4 2026-07-23
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3690 STL → SMF Jul 26, 16:35 UTCJul 26, 20:10 UTC3h 35m
2026-07-26 SWA3974 BWI → PWM Jul 26, 12:15 UTCJul 26, 15:15 UTC3h 0m
2026-07-26 SWA3974 BWI → PWM Jul 26, 12:15 UTCJul 26, 15:18 UTC3h 3m
2026-07-26 SWA2708 SEA → OAK Jul 26, 02:20 UTCJul 26, 05:00 UTC2h 40m
2026-07-26 SWA2708 SEA → OAK Jul 26, 02:17 UTCJul 26, 04:58 UTC2h 41m
2026-07-25 SWA1599 SEA → OAK Jul 25, 23:30 UTCJul 26, 01:00 UTC1h 30m
2026-07-25 SWA1599 SEA → OAK Jul 25, 23:26 UTCJul 26, 00:55 UTC1h 29m
2026-07-25 SWA1599 SEA → OAK Jul 25, 21:00 UTCJul 25, 21:30 UTC30m
2026-07-25 SWA4189 DAL → LGA Jul 25, 16:20 UTCJul 25, 19:25 UTC3h 5m
2026-07-25 SWA4189 DAL → LGA Jul 25, 16:16 UTCJul 25, 19:20 UTC3h 4m
2026-07-25 SWA4189 DAL → LGA Jul 25, 13:15 UTCJul 25, 14:55 UTC1h 40m
2026-07-25 SWA2801 DEN → MEM Jul 25, 10:15 UTCJul 25, 11:45 UTC1h 30m
2026-07-25 SWA4762 SDF → TPA Jul 25, 03:15 UTCJul 25, 05:30 UTC2h 15m
2026-07-25 SWA4762 SDF → TPA Jul 25, 03:10 UTCJul 25, 05:29 UTC2h 19m
2026-07-25 SWA2820 MCO → MHT Jul 25, 00:10 UTCJul 25, 02:10 UTC2h 0m
2026-07-25 SWA2820 MCO → MHT Jul 25, 00:05 UTCJul 25, 02:05 UTC2h 0m
2026-07-24 SWA2241 OAK → PDX Jul 24, 22:00 UTCJul 24, 23:10 UTC1h 10m
2026-07-24 SWA3142 PHX → DEN Jul 24, 17:05 UTCJul 24, 20:40 UTC3h 35m
2026-07-24 SWA3142 PHX → DEN Jul 24, 17:03 UTCJul 24, 20:36 UTC3h 33m
2026-07-24 SWA759 LAX → OAK Jul 24, 14:59 UTCJul 24, 15:45 UTC46m
2026-07-24 SWA759 LAX → OAK Jul 24, 15:00 UTCJul 24, 15:50 UTC50m
2026-07-24 SWA4123 BUR → OAK Jul 24, 12:00 UTCJul 24, 13:45 UTC1h 45m
2026-07-24 SWA4404 MSY → BUR Jul 24, 02:15 UTCJul 24, 04:20 UTC2h 5m
2026-07-23 SWA4537 ORF → DAL Jul 23, 22:50 UTCJul 24, 00:35 UTC1h 45m
2026-07-23 SWA4537 ORF → DAL Jul 23, 22:48 UTCJul 24, 00:32 UTC1h 44m
2026-07-23 SWA560 SJC → HNL Jul 23, 20:40 UTCJul 23, 21:45 UTC1h 5m
2026-07-23 SWA2258 AUS → SAN Jul 23, 17:05 UTCJul 23, 19:30 UTC2h 25m
2026-07-23 SWA2258 AUS → SAN Jul 23, 17:03 UTCJul 23, 19:27 UTC2h 24m
2026-07-23 SWA2629 SJC → SAN Jul 23, 12:30 UTCJul 23, 15:40 UTC3h 10m
2026-07-23 SWA3374 IAD → DEN Jul 23, 09:25 UTCJul 23, 11:05 UTC1h 40m
2026-07-23 SWA2754 DTW → DEN Jul 23, 01:50 UTCJul 23, 03:45 UTC1h 55m
2026-07-22 SWA1217 FLL → MDW Jul 22, 22:50 UTCJul 23, 00:35 UTC1h 45m
2026-07-22 SWA1217 FLL → MDW Jul 22, 22:48 UTCJul 23, 00:30 UTC1h 42m
2026-07-22 SWA4594 BDL → BWI Jul 22, 21:10 UTCJul 22, 21:55 UTC45m
2026-07-22 SWA3769 DAL → LAS Jul 22, 16:30 UTCJul 22, 20:00 UTC3h 30m
2026-07-22 SWA3769 DAL → LAS Jul 22, 16:27 UTCJul 22, 19:58 UTC3h 31m
2026-07-22 SWA2669 BUR → SFO Jul 22, 14:05 UTCJul 22, 15:10 UTC1h 5m
2026-07-22 SWA2669 BUR → SFO Jul 22, 14:03 UTCJul 22, 15:08 UTC1h 5m
2026-07-22 SWA3210 MCO → BDL Jul 22, 03:59 UTCJul 22, 05:00 UTC1h 1m
2026-07-22 SWA3210 MCO → BDL Jul 22, 04:00 UTCJul 22, 05:05 UTC1h 5m
2026-07-22 SWA3337 SJC → PDX Jul 22, 01:30 UTCJul 22, 02:50 UTC1h 20m
2026-07-21 SWA4972 MDW → OAK Jul 21, 23:40 UTCJul 22, 00:15 UTC35m
2026-07-21 SWA4396 - Jul 21, 21:10 UTCJul 21, 22:10 UTC1h 0m
2026-07-21 SWA2218 BUR → SJC Jul 21, 17:40 UTCJul 21, 20:05 UTC2h 25m
2026-07-21 SWA2218 BUR → SJC Jul 21, 17:35 UTCJul 21, 19:57 UTC2h 23m
2026-07-21 SWA347 - Jul 21, 13:15 UTCJul 21, 16:20 UTC3h 5m
2026-07-21 SWA347 - Jul 21, 10:05 UTCJul 21, 12:05 UTC2h 0m
2026-07-21 SWA4567 - Jul 21, 01:35 UTCJul 21, 03:45 UTC2h 10m
2026-07-20 SWA1610 - Jul 20, 20:20 UTCJul 20, 23:30 UTC3h 10m
2026-07-20 SWA1610 CUN → BWI Jul 20, 20:15 UTCJul 20, 23:27 UTC3h 12m

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 Jul 26, 20:15 UTC.
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, SWA1599, SWA494, SWA4537.