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sensors Mode-S transponder

AC4237

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8894Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC4237
Octal
53041067
Decimal
11,289,143
Country
US
Tail
N8894Q
Type
B38M
Broadcasting now · callsign SWA329 · 38,000 ft
Flights observed
670
Distinct callsigns
20
Country
US
Last broadcast
36m ago

Current position

AC4237 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC4237 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
SWA3465 Southwest Airlines 7 2026-05-26
SWA3261 - 6 2026-06-29
SWA653 Southwest Airlines 5 2026-06-06
SWA2125 Southwest Airlines 5 2026-04-17
SWA1526 - 5 2026-06-29
SWA490 - 4 2026-07-14
SWA3870 Southwest Airlines 4 2026-05-31
SWA314 Southwest Airlines 4 2026-06-16
SWA2792 - 4 2026-07-01
SWA1732 - 4 2026-07-09
SWA168 Southwest Airlines 4 2026-06-12
SWA999 Southwest Airlines 3 2026-04-16
SWA956 Southwest Airlines 3 2026-05-08
SWA914 - 3 2026-06-21
SWA868 Southwest Airlines 3 2026-05-31
SWA790 Southwest Airlines 3 2026-04-18
SWA639 Southwest Airlines 3 2026-05-31
SWA571 - 3 2026-07-09
SWA570 - 3 2026-07-01
SWA4930 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA329 - Jul 14, 23:30 UTCJul 14, 23:45 UTC15m
2026-07-14 SWA4956 SEA → AUS Jul 14, 18:45 UTCJul 14, 22:30 UTC3h 45m
2026-07-14 SWA1451 LAS → SEA Jul 14, 15:05 UTCJul 14, 17:05 UTC2h 0m
2026-07-14 SWA1451 LAS → SEA Jul 14, 15:05 UTCJul 14, 16:59 UTC1h 55m
2026-07-14 SWA2403 - Jul 14, 12:50 UTCJul 14, 13:35 UTC45m
2026-07-14 SWA1330 DAL → LAX Jul 14, 04:20 UTCJul 14, 06:55 UTC2h 35m
2026-07-14 SWA1330 DAL → LAX Jul 14, 04:15 UTCJul 14, 06:53 UTC2h 38m
2026-07-14 SWA490 - Jul 14, 01:35 UTCJul 14, 03:00 UTC1h 25m
2026-07-14 SWA490 BNA → DAL Jul 14, 01:33 UTCJul 14, 02:57 UTC1h 25m
2026-07-13 SWA4005 - Jul 13, 22:05 UTCJul 13, 23:35 UTC1h 30m
2026-07-13 SWA4005 TPA → BNA Jul 13, 22:03 UTCJul 13, 23:26 UTC1h 23m
2026-07-13 SWA2372 LAS → TPA Jul 13, 16:30 UTCJul 13, 20:35 UTC4h 5m
2026-07-13 SWA2970 SAN → LAS Jul 13, 13:57 UTCJul 13, 14:49 UTC53m
2026-07-13 SWA2970 - Jul 13, 14:00 UTCJul 13, 14:55 UTC55m
2026-07-13 SWA3653 SFO → SAN Jul 13, 05:31 UTCJul 13, 06:55 UTC1h 25m
2026-07-13 SWA3653 SFO → SAN Jul 13, 05:31 UTCJul 13, 06:52 UTC1h 21m
2026-07-13 SWA4857 - Jul 13, 03:20 UTCJul 13, 04:15 UTC55m
2026-07-13 SWA4857 LAX → SFO Jul 13, 03:20 UTCJul 13, 04:08 UTC49m
2026-07-12 SWA4857 - Jul 12, 22:55 UTCJul 13, 01:50 UTC2h 55m
2026-07-12 SWA2498 - Jul 12, 18:05 UTCJul 12, 21:15 UTC3h 10m
2026-07-12 SWA4044 - Jul 12, 15:01 UTCJul 12, 16:35 UTC1h 35m
2026-07-12 SWA745 BOS → MDW Jul 12, 11:41 UTCJul 12, 13:44 UTC2h 3m
2026-07-12 SWA745 BOS → MDW Jul 12, 11:40 UTCJul 12, 13:45 UTC2h 5m
2026-07-11 SWA4930 SAN → BOS Jul 11, 21:45 UTCJul 12, 02:55 UTC5h 10m
2026-07-11 SWA4930 SAN → BOS Jul 11, 21:46 UTCJul 12, 02:50 UTC5h 4m
2026-07-11 SWA458 LAS → SAN Jul 11, 20:00 UTCJul 11, 20:45 UTC45m
2026-07-11 SWA1466 DCA → LAS Jul 11, 13:57 UTCJul 11, 18:17 UTC4h 20m
2026-07-11 SWA1466 DCA → LAS Jul 11, 14:00 UTCJul 11, 18:20 UTC4h 20m
2026-07-11 SWA1172 - Jul 11, 02:55 UTCJul 11, 04:15 UTC1h 20m
2026-07-10 SWA3879 - Jul 10, 23:00 UTCJul 11, 01:20 UTC2h 20m
2026-07-10 SWA3879 SRQ → MDW Jul 10, 22:59 UTCJul 11, 01:19 UTC2h 20m
2026-07-10 SWA4817 - Jul 10, 19:15 UTCJul 10, 21:20 UTC2h 6m
2026-07-10 SWA2143 - Jul 10, 17:15 UTCJul 10, 18:10 UTC55m
2026-07-10 SWA4691 - Jul 10, 15:20 UTCJul 10, 16:05 UTC45m
2026-07-10 SWA3559 - Jul 10, 10:20 UTCJul 10, 13:30 UTC3h 10m
2026-07-10 SWA3559 SAT → BWI Jul 10, 10:19 UTCJul 10, 13:24 UTC3h 5m
2026-07-10 SWA3979 - Jul 10, 03:25 UTCJul 10, 05:15 UTC1h 50m
2026-07-10 SWA3979 STL → SAT Jul 10, 03:23 UTCJul 10, 05:12 UTC1h 49m
2026-07-09 SWA3353 PHX → STL Jul 9, 23:55 UTCJul 10, 02:35 UTC2h 40m
2026-07-09 SWA3353 PHX → STL Jul 9, 23:55 UTCJul 10, 02:25 UTC2h 30m
2026-07-09 SWA3353 SLC → PHX Jul 9, 21:45 UTCJul 9, 23:00 UTC1h 15m
2026-07-09 SWA1732 - Jul 9, 19:30 UTCJul 9, 20:35 UTC1h 5m
2026-07-09 SWA1732 DEN → SLC Jul 9, 19:30 UTCJul 9, 20:28 UTC58m
2026-07-09 SWA699 - Jul 9, 17:00 UTCJul 9, 18:25 UTC1h 25m
2026-07-09 SWA818 - Jul 9, 14:20 UTCJul 9, 15:45 UTC1h 25m
2026-07-09 SWA1970 - Jul 9, 10:45 UTCJul 9, 12:45 UTC2h 0m
2026-07-09 SWA2645 - Jul 9, 05:25 UTCJul 9, 07:15 UTC1h 50m
2026-07-09 SWA571 TPA → MCO Jul 9, 03:55 UTCJul 9, 04:20 UTC25m
2026-07-09 SWA571 TPA → MCO Jul 9, 03:53 UTCJul 9, 04:17 UTC24m
2026-07-09 SWA571 BNA → TPA Jul 9, 01:00 UTCJul 9, 02:55 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 N8894Q page for operator, model, and routing details .

Mode-S AC4237 frequently asked

What is Mode-S code AC4237?
AC4237 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8894Q.
Where is Mode-S AC4237 registered?
Mode-S code AC4237 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 AC4237 broadcasting right now?
Yes. Mode-S AC4237 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4237, octal 53041067, decimal 11,289,143.
What flights does AC4237 operate?
Mode-S AC4237 has broadcast 20 distinct callsigns, including SWA3465, SWA3261, SWA653, SWA2125, SWA1526.