Apparatus

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sensors Mode-S transponder

AC538F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8935Q · operated by SOUTHWEST AIRLINES CO

Hex
AC538F
Octal
53051617
Decimal
11,293,583
Country
US
Tail
N8935Q
Type
B38M
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
768
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S AC538F.

Country allocation

The ICAO 24-bit address AC538F 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
SWA3774 Southwest Airlines 6 2026-05-03
SWA956 Southwest Airlines 5 2026-04-17
SWA200 Southwest Airlines 5 2026-04-16
SWA4641 Southwest Airlines 4 2026-04-16
SWA425 Southwest Airlines 4 2026-04-21
SWA3445 Southwest Airlines 4 2026-04-15
SWA3412 Southwest Airlines 4 2026-05-29
SWA2538 Southwest Airlines 4 2026-06-02
SWA2497 - 4 2026-07-02
SWA2169 Southwest Airlines 4 2026-05-18
SWA155 Southwest Airlines 4 2026-06-07
SWA1151 - 4 2026-07-03
SWA1066 Southwest Airlines 4 2026-06-09
SWA982 Southwest Airlines 3 2026-06-06
SWA8509 Southwest Airlines 3 2026-07-23
SWA527 Southwest Airlines 3 2026-06-07
SWA457 Southwest Airlines 3 2026-06-13
SWA4440 Southwest Airlines 3 2026-04-22
SWA4338 - 3 2026-07-13
SWA3705 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3657 LAX → OAK Jul 26, 17:30 UTCJul 26, 21:20 UTC3h 50m
2026-07-26 SWA3537 GRR → RSW Jul 26, 15:25 UTCJul 26, 16:25 UTC1h 0m
2026-07-26 SWA4469 MSP → PHX Jul 26, 11:30 UTCJul 26, 13:50 UTC2h 20m
2026-07-26 SWA2004 ONT → OAK Jul 26, 01:10 UTCJul 26, 02:45 UTC1h 35m
2026-07-26 SWA2004 ONT → OAK Jul 26, 01:09 UTCJul 26, 02:40 UTC1h 31m
2026-07-25 SWA343 SJC → SAN Jul 25, 22:50 UTCJul 26, 00:15 UTC1h 25m
2026-07-25 SWA343 SJC → SAN Jul 25, 18:40 UTCJul 25, 21:30 UTC2h 50m
2026-07-25 SWA1841 MDW → PHL Jul 25, 15:30 UTCJul 25, 17:20 UTC1h 50m
2026-07-25 SWA3737 LAS → TPA Jul 25, 13:10 UTCJul 25, 14:05 UTC55m
2026-07-25 SWA1737 HNL → OAK Jul 25, 03:20 UTCJul 25, 04:25 UTC1h 5m
2026-07-24 SWA3913 MSY → LGA Jul 24, 23:55 UTCJul 25, 01:40 UTC1h 45m
2026-07-24 SWA1173 BWI → LGA Jul 24, 21:15 UTCJul 24, 22:50 UTC1h 35m
2026-07-24 SWA4343 TPA → STL Jul 24, 18:30 UTCJul 24, 19:50 UTC1h 20m
2026-07-24 SWA4343 TPA → STL Jul 24, 18:25 UTCJul 24, 19:50 UTC1h 26m
2026-07-24 SWA1161 SAN → OAK Jul 24, 16:30 UTCJul 24, 17:20 UTC50m
2026-07-24 SWA2278 SNA → OAK Jul 24, 13:30 UTCJul 24, 15:30 UTC2h 0m
2026-07-24 SWA4580 SAT → DAL Jul 24, 10:20 UTCJul 24, 12:00 UTC1h 40m
2026-07-24 SWA3908 LAS → PHX Jul 24, 01:35 UTCJul 24, 03:05 UTC1h 30m
2026-07-23 SWA2400 SJC → KOA Jul 23, 21:35 UTCJul 23, 23:45 UTC2h 10m
2026-07-23 SWA2400 SJC → KOA Jul 23, 21:32 UTCJul 24, 00:37 UTC3h 6m
2026-07-23 SWA4602 OAK → GEG Jul 23, 19:20 UTCJul 23, 20:15 UTC55m
2026-07-23 SWA8509 SFO → OAK Jul 23, 17:00 UTCJul 23, 17:45 UTC45m
2026-07-23 SWA1089 HNL → SJC Jul 23, 01:35 UTCJul 23, 06:20 UTC4h 45m
2026-07-23 SWA1089 HNL → SJC Jul 23, 01:31 UTCJul 23, 06:14 UTC4h 43m
2026-07-22 SWA2854 BUR → OAK Jul 22, 19:40 UTCJul 23, 00:10 UTC4h 30m
2026-07-22 SWA2854 BUR → OAK Jul 22, 19:35 UTCJul 22, 23:54 UTC4h 19m
2026-07-22 SWA4903 LGA → MDW Jul 22, 17:11 UTCJul 22, 18:10 UTC1h 0m
2026-07-22 SWA4903 LGA → MDW Jul 22, 17:15 UTCJul 22, 18:10 UTC55m
2026-07-22 SWA2452 IND → TPA Jul 22, 15:05 UTCJul 22, 15:35 UTC30m
2026-07-22 SWA2452 IND → TPA Jul 22, 15:00 UTCJul 22, 15:58 UTC58m
2026-07-22 SWA2412 SJC → LAS Jul 22, 12:10 UTCJul 22, 13:31 UTC1h 21m
2026-07-22 SWA2412 SJC → LAS Jul 22, 12:10 UTCJul 22, 13:40 UTC1h 30m
2026-07-22 SWA2328 SNA → SJC Jul 22, 02:45 UTCJul 22, 04:55 UTC2h 10m
2026-07-22 SWA2328 SNA → SJC Jul 22, 00:05 UTCJul 22, 01:30 UTC1h 25m
2026-07-21 SWA2328 SNA → SJC Jul 21, 21:55 UTCJul 21, 22:55 UTC1h 0m
2026-07-21 SWA964 OAK → RNO Jul 21, 19:55 UTCJul 21, 20:40 UTC45m
2026-07-21 SWA964 OAK → RNO Jul 21, 19:55 UTCJul 21, 20:38 UTC43m
2026-07-21 SWA747 HNL → ITO Jul 21, 18:05 UTCJul 21, 18:50 UTC45m
2026-07-21 SWA747 HNL → ITO Jul 21, 18:00 UTCJul 21, 18:51 UTC52m
2026-07-21 SWA3917 SJU → TPA Jul 21, 14:50 UTCJul 21, 15:45 UTC55m
2026-07-21 SWA3917 SJU → TPA Jul 21, 14:49 UTCJul 21, 16:45 UTC1h 56m
2026-07-21 SWA4172 SLC → LAX Jul 21, 12:50 UTCJul 21, 13:25 UTC35m
2026-07-21 SWA2517 OAK → BUR Jul 21, 10:55 UTCJul 21, 11:45 UTC50m
2026-07-21 SWA1338 - Jul 21, 04:05 UTCJul 21, 04:40 UTC35m
2026-07-21 SWA1338 DAL → LIT Jul 21, 04:01 UTCJul 21, 04:48 UTC47m
2026-07-21 SWA1338 - Jul 21, 02:05 UTCJul 21, 02:55 UTC50m
2026-07-20 SWA3511 BNA → PHL Jul 20, 22:25 UTCJul 21, 01:05 UTC2h 39m
2026-07-20 SWA3511 BNA → PHL Jul 20, 22:22 UTCJul 21, 01:03 UTC2h 41m
2026-07-20 SWA333 BUR → SFO Jul 20, 18:20 UTCJul 20, 20:50 UTC2h 30m
2026-07-20 SWA866 PWM → BWI Jul 20, 14:00 UTCJul 20, 16:50 UTC2h 50m

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 N8935Q page for operator, model, and routing details .

Mode-S AC538F frequently asked

What is Mode-S code AC538F?
AC538F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8935Q.
Where is Mode-S AC538F registered?
Mode-S code AC538F 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 AC538F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC538F, octal 53051617, decimal 11,293,583.
What flights does AC538F operate?
Mode-S AC538F has broadcast 20 distinct callsigns, including SWA3774, SWA956, SWA200, SWA4641, SWA425.