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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
Broadcasting now · callsign SWA855 · 1,050 ft
Flights observed
680
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AC6243 is currently broadcasting. Map zoomed to live position.

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
SWA455 Southwest Airlines 4 2026-06-06
SWA2529 Southwest Airlines 4 2026-04-13
SWA1885 - 4 2026-04-14
SWA1406 - 4 2026-06-19
SWA857 Southwest Airlines 3 2026-04-18
SWA769 - 3 2026-04-13
SWA55 - 3 2026-06-28
SWA4661 Southwest Airlines 3 2026-05-10
SWA426 Southwest Airlines 3 2026-05-28
SWA3804 Southwest Airlines 3 2026-04-18
SWA3780 Southwest Airlines 3 2026-05-13
SWA374 Southwest Airlines 3 2026-06-27
SWA3457 Southwest Airlines 3 2026-04-30
SWA336 Southwest Airlines 3 2026-05-07
SWA2958 Southwest Airlines 3 2026-05-18
SWA29 Southwest Airlines 3 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA855 - Jul 14, 20:55 UTCJul 14, 22:45 UTC1h 49m
2026-07-14 SWA2112 LAS → BNA Jul 14, 16:25 UTCJul 14, 19:45 UTC3h 20m
2026-07-14 SWA2814 - Jul 14, 12:15 UTCJul 14, 15:00 UTC2h 45m
2026-07-14 SWA2814 MEM → LAS Jul 14, 12:11 UTCJul 14, 15:00 UTC2h 49m
2026-07-14 SWA580 - Jul 14, 04:45 UTCJul 14, 05:25 UTC40m
2026-07-14 SWA580 BNA → MEM Jul 14, 04:44 UTCJul 14, 05:24 UTC40m
2026-07-14 SWA3363 - Jul 14, 02:10 UTCJul 14, 03:20 UTC1h 10m
2026-07-13 SWA4381 - Jul 13, 22:30 UTCJul 14, 01:15 UTC2h 45m
2026-07-13 SWA4381 DEN → PIT Jul 13, 22:26 UTCJul 14, 01:06 UTC2h 40m
2026-07-13 SWA1423 - Jul 13, 19:10 UTCJul 13, 21:00 UTC1h 50m
2026-07-13 SWA1423 - Jul 13, 17:15 UTCJul 13, 18:00 UTC45m
2026-07-13 SWA4350 - Jul 13, 11:30 UTCJul 13, 15:15 UTC3h 45m
2026-07-13 SWA4350 PIT → LAS Jul 13, 11:26 UTCJul 13, 15:12 UTC3h 47m
2026-07-13 SWA4164 BWI → PIT Jul 13, 03:45 UTCJul 13, 04:25 UTC40m
2026-07-13 SWA1898 BOS → BWI Jul 13, 01:20 UTCJul 13, 02:25 UTC1h 5m
2026-07-12 SWA1898 AUS → BOS Jul 12, 20:15 UTCJul 12, 23:50 UTC3h 35m
2026-07-12 SWA2677 OKC → AUS Jul 12, 18:10 UTCJul 12, 19:01 UTC50m
2026-07-12 SWA2855 LAS → OKC Jul 12, 14:55 UTCJul 12, 17:10 UTC2h 15m
2026-07-12 SWA3662 - Jul 12, 11:01 UTCJul 12, 13:15 UTC2h 15m
2026-07-12 SWA1659 - Jul 12, 02:20 UTCJul 12, 03:20 UTC1h 0m
2026-07-11 SWA3221 - Jul 11, 22:10 UTCJul 12, 01:20 UTC3h 10m
2026-07-11 SWA3221 PHL → PHL Jul 11, 21:45 UTCJul 11, 21:50 UTC5m
2026-07-11 SWA2268 - Jul 11, 18:30 UTCJul 11, 18:45 UTC15m
2026-07-11 SWA2268 STL → PHL Jul 11, 18:30 UTCJul 11, 20:20 UTC1h 50m
2026-07-11 SWA2030 - Jul 11, 15:55 UTCJul 11, 17:25 UTC1h 30m
2026-07-11 SWA2030 ECP → STL Jul 11, 15:52 UTCJul 11, 17:18 UTC1h 26m
2026-07-11 SWA2398 ATL → MKE Jul 11, 13:00 UTCJul 11, 14:45 UTC1h 45m
2026-07-11 SWA3886 - Jul 11, 06:30 UTCJul 11, 10:05 UTC3h 35m
2026-07-11 SWA2352 LAS → SJC Jul 11, 04:10 UTCJul 11, 05:05 UTC55m
2026-07-11 SWA2352 - Jul 11, 02:15 UTCJul 11, 03:05 UTC50m
2026-07-10 SWA1926 OAK → SAN Jul 10, 23:50 UTCJul 11, 01:05 UTC1h 15m
2026-07-10 SWA1926 OAK → SAN Jul 10, 23:50 UTCJul 11, 01:03 UTC1h 14m
2026-07-10 SWA3518 - Jul 10, 21:30 UTCJul 10, 22:30 UTC1h 0m
2026-07-10 SWA1838 EUG → SAN Jul 10, 17:25 UTCJul 10, 19:35 UTC2h 10m
2026-07-10 SWA1532 - Jul 10, 14:10 UTCJul 10, 16:20 UTC2h 10m
2026-07-10 SWA3706 - Jul 10, 11:45 UTCJul 10, 12:50 UTC1h 5m
2026-07-10 SWA1980 - Jul 10, 04:55 UTCJul 10, 05:50 UTC55m
2026-07-10 SWA1980 HOU → ELP Jul 10, 04:50 UTCJul 10, 06:15 UTC1h 25m
2026-07-10 SWA4604 - Jul 10, 01:10 UTCJul 10, 03:35 UTC2h 25m
2026-07-09 SWA3470 - Jul 9, 21:50 UTCJul 10, 00:05 UTC2h 15m
2026-07-09 SWA2137 - Jul 9, 18:10 UTCJul 9, 20:10 UTC2h 0m
2026-07-09 SWA2137 IND → RSW Jul 9, 18:05 UTCJul 9, 20:10 UTC2h 5m
2026-07-09 SWA1552 DEN → IND Jul 9, 14:55 UTCJul 9, 16:50 UTC1h 55m
2026-07-09 SWA3233 PHX → DEN Jul 9, 07:20 UTCJul 9, 08:40 UTC1h 20m
2026-07-09 SWA3753 - Jul 9, 05:15 UTCJul 9, 06:25 UTC1h 10m
2026-07-09 SWA3753 SLC → PHX Jul 9, 05:13 UTCJul 9, 06:27 UTC1h 14m
2026-07-09 SWA1733 - Jul 9, 03:30 UTCJul 9, 04:30 UTC1h 0m
2026-07-09 SWA938 - Jul 9, 00:40 UTCJul 9, 01:50 UTC1h 10m
2026-07-08 SWA938 - Jul 8, 19:20 UTCJul 8, 23:05 UTC3h 45m
2026-07-08 SWA3718 - Jul 8, 16:25 UTCJul 8, 18:05 UTC1h 40m

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?
Yes. Mode-S AC6243 is currently airborne.
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, SWA455.