Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC6243

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8974K · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC6243
Octal
53061103
Decimal
11,297,347
Country
US
Tail
N8974K
Type
B38M
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
768
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AC6243.

Country allocation

The ICAO 24-bit address AC6243 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
SWA2953 Southwest Airlines 8 2026-05-19
SWA551 Southwest Airlines 5 2026-05-12
SWA3307 Southwest Airlines 5 2026-05-17
SWA1901 Southwest Airlines 5 2026-05-19
SWA565 Southwest Airlines 4 2026-07-23
SWA455 Southwest Airlines 4 2026-06-06
SWA2529 Southwest Airlines 4 2026-04-13
SWA1885 - 4 2026-04-14
SWA1406 - 4 2026-06-19
SWA941 - 3 2026-07-18
SWA857 Southwest Airlines 3 2026-04-18
SWA769 - 3 2026-04-13
SWA55 - 3 2026-06-28
SWA507 - 3 2026-07-17
SWA492 Southwest Airlines 3 2026-07-23
SWA4661 Southwest Airlines 3 2026-05-10
SWA4470 - 3 2026-07-16
SWA426 Southwest Airlines 3 2026-05-28
SWA3804 Southwest Airlines 3 2026-04-18
SWA3780 Southwest Airlines 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4322 MCO → MSY Jul 26, 20:35 UTCJul 26, 22:00 UTC1h 25m
2026-07-26 SWA1091 ATL → OKC Jul 26, 15:36 UTCJul 26, 19:06 UTC3h 31m
2026-07-26 SWA1091 ATL → OKC Jul 26, 15:40 UTCJul 26, 19:10 UTC3h 30m
2026-07-26 SWA1503 LAX → SJC Jul 26, 13:10 UTCJul 26, 14:10 UTC1h 0m
2026-07-26 SWA1503 LAX → SJC Jul 26, 13:06 UTCJul 26, 13:53 UTC47m
2026-07-26 SWA4754 MCO → BNA Jul 26, 10:20 UTCJul 26, 12:20 UTC2h 0m
2026-07-26 SWA4754 MCO → BNA Jul 26, 10:19 UTCJul 26, 12:16 UTC1h 57m
2026-07-26 SWA4578 BWI → AUS Jul 26, 01:05 UTCJul 26, 03:00 UTC1h 55m
2026-07-26 SWA4578 BWI → AUS Jul 26, 01:00 UTCJul 26, 02:59 UTC1h 59m
2026-07-25 SWA4462 SJC → PDX Jul 25, 21:45 UTCJul 25, 23:35 UTC1h 50m
2026-07-25 SWA4428 OKC → DEN Jul 25, 19:05 UTCJul 25, 20:30 UTC1h 25m
2026-07-25 SWA4428 OKC → DEN Jul 25, 19:02 UTCJul 25, 20:24 UTC1h 22m
2026-07-25 SWA4441 SJC → PHX Jul 25, 16:30 UTCJul 25, 18:00 UTC1h 30m
2026-07-25 SWA4873 MCO → ATL Jul 25, 13:20 UTCJul 25, 15:15 UTC1h 55m
2026-07-25 SWA1246 IAH → MSY Jul 25, 10:00 UTCJul 25, 10:45 UTC45m
2026-07-25 SWA1246 IAH → MSY Jul 25, 10:00 UTCJul 25, 11:01 UTC1h 1m
2026-07-25 SWA4435 ORD → FLL Jul 25, 02:50 UTCJul 25, 04:00 UTC1h 10m
2026-07-25 SWA4435 ORD → FLL Jul 25, 02:49 UTCJul 25, 03:56 UTC1h 7m
2026-07-24 SWA3385 ALB → DEN Jul 24, 22:50 UTCJul 25, 01:40 UTC2h 50m
2026-07-24 SWA451 SNA → SJC Jul 24, 19:45 UTCJul 24, 21:30 UTC1h 45m
2026-07-24 SWA1485 MDW → MHT Jul 24, 16:20 UTCJul 24, 18:25 UTC2h 5m
2026-07-24 SWA4059 SAN → SMF Jul 24, 13:25 UTCJul 24, 14:50 UTC1h 25m
2026-07-24 SWA354 SAN → OAK Jul 24, 05:40 UTCJul 24, 06:30 UTC50m
2026-07-24 SWA354 SAN → OAK Jul 24, 01:30 UTCJul 24, 04:45 UTC3h 15m
2026-07-23 SWA492 AUS → OKC Jul 23, 22:05 UTCJul 24, 00:30 UTC2h 25m
2026-07-23 SWA1121 SJC → BUR Jul 23, 18:45 UTCJul 23, 20:45 UTC2h 0m
2026-07-23 SWA1121 SJC → BUR Jul 23, 18:40 UTCJul 23, 20:48 UTC2h 8m
2026-07-23 SWA193 MKE → BWI Jul 23, 15:10 UTCJul 23, 17:35 UTC2h 25m
2026-07-23 SWA565 SJC → RNO Jul 23, 12:05 UTCJul 23, 13:35 UTC1h 30m
2026-07-23 SWA565 SJC → RNO Jul 23, 12:05 UTCJul 23, 13:30 UTC1h 26m
2026-07-23 SWA3480 BWI → CMH Jul 23, 05:55 UTCJul 23, 09:25 UTC3h 30m
2026-07-23 SWA382 PHX → RNO Jul 23, 03:30 UTCJul 23, 04:45 UTC1h 15m
2026-07-23 SWA1890 SAN → SMF Jul 23, 00:45 UTCJul 23, 02:20 UTC1h 35m
2026-07-22 SWA1890 SAN → SMF Jul 22, 21:40 UTCJul 22, 23:40 UTC2h 0m
2026-07-22 SWA2119 - Jul 22, 18:10 UTCJul 22, 20:25 UTC2h 15m
2026-07-22 SWA2119 IND → DEN Jul 22, 18:05 UTCJul 22, 20:15 UTC2h 10m
2026-07-22 SWA362 BOI → SJC Jul 22, 14:45 UTCJul 22, 16:45 UTC2h 0m
2026-07-22 SWA362 BOI → SJC Jul 22, 14:44 UTCJul 22, 16:41 UTC1h 57m
2026-07-22 SWA4230 OAK → HOU Jul 22, 11:55 UTCJul 22, 13:20 UTC1h 25m
2026-07-22 SWA4230 OAK → HOU Jul 22, 11:51 UTCJul 22, 13:18 UTC1h 27m
2026-07-22 SWA3459 ATL → RDU Jul 22, 02:15 UTCJul 22, 04:30 UTC2h 15m
2026-07-22 SWA2493 - Jul 22, 00:05 UTCJul 22, 01:05 UTC1h 0m
2026-07-21 SWA3650 - Jul 21, 21:50 UTCJul 21, 22:55 UTC1h 5m
2026-07-21 SWA3650 SMF → LGB Jul 21, 21:45 UTCJul 21, 22:49 UTC1h 4m
2026-07-21 SWA2347 - Jul 21, 19:35 UTCJul 21, 20:35 UTC1h 0m
2026-07-21 SWA446 LGB → SJC Jul 21, 17:05 UTCJul 21, 18:10 UTC1h 5m
2026-07-21 SWA446 LGB → SJC Jul 21, 14:40 UTCJul 21, 16:10 UTC1h 30m
2026-07-21 SWA2522 MCO → MHT Jul 21, 11:25 UTCJul 21, 12:45 UTC1h 20m
2026-07-21 SWA1341 - Jul 21, 03:20 UTCJul 21, 04:05 UTC45m
2026-07-21 SWA490 LAX → OAK Jul 21, 00:50 UTCJul 21, 02:15 UTC1h 25m

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 N8974K page for operator, model, and routing details .

Mode-S AC6243 frequently asked

What is Mode-S code AC6243?
AC6243 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8974K.
Where is Mode-S AC6243 registered?
Mode-S code AC6243 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 AC6243 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC6243, octal 53061103, decimal 11,297,347.
What flights does AC6243 operate?
Mode-S AC6243 has broadcast 20 distinct callsigns, including SWA2953, SWA551, SWA3307, SWA1901, SWA565.