Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC4843

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8904L · operated by SOUTHWEST AIRLINES CO

Hex
AC4843
Octal
53044103
Decimal
11,290,691
Country
US
Tail
N8904L
Type
B38M
Broadcasting now · callsign SWA3199 · 39,000 ft
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AC4843 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC4843 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
SWA29 Southwest Airlines 6 2026-04-17
SWA940 - 4 2026-06-22
SWA823 - 4 2026-06-25
SWA519 - 4 2026-07-12
SWA4006 Southwest Airlines 4 2026-05-02
SWA3911 - 4 2026-07-02
SWA3449 - 4 2026-07-11
SWA2462 Southwest Airlines 4 2026-06-02
SWA1136 Southwest Airlines 4 2026-04-15
SWA968 - 3 2026-06-25
SWA935 Southwest Airlines 3 2026-05-18
SWA695 Southwest Airlines 3 2026-05-14
SWA681 - 3 2026-07-07
SWA44 Southwest Airlines 3 2026-06-29
SWA4250 - 3 2026-07-04
SWA4145 - 3 2026-04-13
SWA4047 Southwest Airlines 3 2026-06-14
SWA404 Southwest Airlines 3 2026-06-02
SWA3670 Southwest Airlines 3 2026-05-09
SWA347 Southwest Airlines 3 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SWA4765 - Jul 13, 22:40 UTCJul 14, 02:15 UTC3h 35m
2026-07-13 SWA359 AUS → MDW Jul 13, 19:10 UTCJul 13, 21:30 UTC2h 20m
2026-07-13 SWA4744 PHX → AUS Jul 13, 15:59 UTCJul 13, 17:50 UTC1h 51m
2026-07-13 SWA4744 - Jul 13, 16:00 UTCJul 13, 17:55 UTC1h 55m
2026-07-13 SWA4256 COS → PHX Jul 13, 12:55 UTCJul 13, 14:15 UTC1h 20m
2026-07-13 SWA3335 - Jul 13, 05:40 UTCJul 13, 07:05 UTC1h 25m
2026-07-13 SWA3335 PHX → COS Jul 13, 05:39 UTCJul 13, 07:03 UTC1h 24m
2026-07-13 SWA142 SLC → PHX Jul 13, 03:25 UTCJul 13, 04:45 UTC1h 20m
2026-07-13 SWA2796 OAK → SLC Jul 13, 00:55 UTCJul 13, 02:20 UTC1h 25m
2026-07-12 SWA4539 - Jul 12, 22:30 UTCJul 12, 23:55 UTC1h 25m
2026-07-12 SWA3755 DEN → BOI Jul 12, 19:51 UTCJul 12, 21:14 UTC1h 23m
2026-07-12 SWA3755 - Jul 12, 19:55 UTCJul 12, 21:15 UTC1h 20m
2026-07-12 SWA519 - Jul 12, 16:55 UTCJul 12, 18:25 UTC1h 30m
2026-07-12 SWA519 TUS → DEN Jul 12, 16:54 UTCJul 12, 18:23 UTC1h 29m
2026-07-12 SWA519 LAS → TUS Jul 12, 15:01 UTCJul 12, 15:50 UTC50m
2026-07-12 SWA519 MDW → LAS Jul 12, 10:15 UTCJul 12, 13:15 UTC3h 0m
2026-07-12 SWA2469 LGA → MDW Jul 12, 03:45 UTCJul 12, 05:20 UTC1h 35m
2026-07-12 SWA2041 - Jul 12, 00:55 UTCJul 12, 02:40 UTC1h 45m
2026-07-11 SWA2041 - Jul 11, 21:30 UTCJul 11, 23:30 UTC2h 0m
2026-07-11 SWA5061 - Jul 11, 17:20 UTCJul 11, 20:10 UTC2h 50m
2026-07-11 SWA3449 DCA → BNA Jul 11, 14:35 UTCJul 11, 16:00 UTC1h 25m
2026-07-11 SWA3449 DCA → BNA Jul 11, 14:36 UTCJul 11, 15:59 UTC1h 23m
2026-07-11 SWA366 ATL → DCA Jul 11, 12:00 UTCJul 11, 13:20 UTC1h 20m
2026-07-11 SWA447 BNA → ATL Jul 11, 04:30 UTCJul 11, 05:05 UTC35m
2026-07-11 SWA447 BNA → ATL Jul 11, 04:26 UTCJul 11, 05:06 UTC40m
2026-07-11 SWA2449 LGA → BNA Jul 11, 01:34 UTCJul 11, 03:20 UTC1h 46m
2026-07-11 SWA2449 LGA → BNA Jul 11, 01:35 UTCJul 11, 03:20 UTC1h 45m
2026-07-10 SWA4962 - Jul 10, 21:15 UTCJul 10, 23:25 UTC2h 10m
2026-07-10 SWA4962 STL → LGA Jul 10, 21:11 UTCJul 10, 23:12 UTC2h 2m
2026-07-10 SWA4917 BOS → STL Jul 10, 17:30 UTCJul 10, 20:00 UTC2h 30m
2026-07-10 SWA887 - Jul 10, 15:15 UTCJul 10, 16:15 UTC1h 0m
2026-07-10 SWA887 BWI → BOS Jul 10, 15:14 UTCJul 10, 16:12 UTC58m
2026-07-10 SWA3717 - Jul 10, 11:30 UTCJul 10, 13:30 UTC2h 0m
2026-07-10 SWA3717 - Jul 10, 09:55 UTCJul 10, 10:05 UTC10m
2026-07-10 SWA2708 - Jul 10, 05:50 UTCJul 10, 06:10 UTC20m
2026-07-10 SWA2708 - Jul 10, 03:40 UTCJul 10, 04:35 UTC55m
2026-07-09 SWA1595 DEN → MCO Jul 9, 22:45 UTCJul 10, 02:25 UTC3h 40m
2026-07-09 SWA2967 MSP → DEN Jul 9, 19:15 UTCJul 9, 20:55 UTC1h 40m
2026-07-09 SWA3973 DEN → MSP Jul 9, 16:30 UTCJul 9, 17:55 UTC1h 25m
2026-07-09 SWA2454 LGA → DEN Jul 9, 11:30 UTCJul 9, 15:00 UTC3h 30m
2026-07-09 SWA2289 - Jul 9, 01:50 UTCJul 9, 03:25 UTC1h 35m
2026-07-08 SWA2289 STL → MDW Jul 8, 23:55 UTCJul 9, 00:40 UTC45m
2026-07-08 SWA3880 - Jul 8, 20:40 UTCJul 8, 22:45 UTC2h 5m
2026-07-08 SWA3880 SRQ → STL Jul 8, 20:35 UTCJul 8, 22:42 UTC2h 7m
2026-07-08 SWA677 - Jul 8, 17:50 UTCJul 8, 19:25 UTC1h 35m
2026-07-08 SWA4492 - Jul 8, 12:50 UTCJul 8, 16:30 UTC3h 40m
2026-07-08 SWA207 - Jul 8, 04:25 UTCJul 8, 07:10 UTC2h 45m
2026-07-08 SWA207 - Jul 8, 00:30 UTCJul 8, 02:10 UTC1h 40m
2026-07-07 SWA681 - Jul 7, 21:40 UTCJul 7, 23:15 UTC1h 35m
2026-07-07 SWA681 MCI → ATL Jul 7, 21:35 UTCJul 7, 23:15 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 N8904L page for operator, model, and routing details .

Mode-S AC4843 frequently asked

What is Mode-S code AC4843?
AC4843 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8904L.
Where is Mode-S AC4843 registered?
Mode-S code AC4843 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 AC4843 broadcasting right now?
Yes. Mode-S AC4843 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4843, octal 53044103, decimal 11,290,691.
What flights does AC4843 operate?
Mode-S AC4843 has broadcast 20 distinct callsigns, including SWA29, SWA940, SWA823, SWA519, SWA4006.