Apparatus

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sensors Mode-S transponder

AC4CA8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8919K · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC4CA8
Octal
53046250
Decimal
11,291,816
Country
US
Tail
N8919K
Type
B38M
Broadcasting now · callsign SWA974 · 8,025 ft
Flights observed
714
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Current position

AC4CA8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC4CA8 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
SWA4470 Southwest Airlines 6 2026-07-23
SWA869 - 5 2026-06-24
SWA2430 - 5 2026-07-04
SWA1162 - 5 2026-07-11
SWA3194 Southwest Airlines 4 2026-06-03
SWA284 Southwest Airlines 4 2026-07-23
SWA2303 Southwest Airlines 4 2026-05-02
SWA1355 - 4 2026-07-14
SWA1263 Southwest Airlines 4 2026-05-22
SWA1031 - 4 2026-06-24
SWA768 - 3 2026-07-04
SWA576 Southwest Airlines 3 2026-04-13
SWA509 Southwest Airlines 3 2026-05-22
SWA485 Southwest Airlines 3 2026-06-09
SWA4281 Southwest Airlines 3 2026-05-17
SWA4133 Southwest Airlines 3 2026-05-14
SWA4124 - 3 2026-07-06
SWA4092 - 3 2026-07-12
SWA3918 Southwest Airlines 3 2026-07-26
SWA3900 Southwest Airlines 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1656 MDW → BNA Jul 26, 19:55 UTCJul 26, 20:30 UTC35m
2026-07-26 SWA4206 PHX → LGB Jul 26, 17:20 UTCJul 26, 18:35 UTC1h 15m
2026-07-26 SWA4206 PHX → LGB Jul 26, 15:45 UTCJul 26, 16:15 UTC30m
2026-07-26 SWA1954 MDW → CVG Jul 26, 12:20 UTCJul 26, 14:00 UTC1h 40m
2026-07-26 SWA1861 MDW → MSP Jul 26, 09:10 UTCJul 26, 11:15 UTC2h 5m
2026-07-26 SWA3918 BWI → MSY Jul 26, 00:00 UTCJul 26, 02:30 UTC2h 30m
2026-07-25 SWA3918 BWI → MSY Jul 25, 23:59 UTCJul 26, 02:22 UTC2h 24m
2026-07-25 SWA2400 SJC → KOA Jul 25, 20:00 UTCJul 25, 23:10 UTC3h 10m
2026-07-25 SWA2400 SJC → KOA Jul 25, 19:59 UTCJul 25, 23:09 UTC3h 10m
2026-07-25 SWA4957 BWI → LAX Jul 25, 17:50 UTCJul 25, 18:50 UTC1h 0m
2026-07-25 SWA748 PHX → RNO Jul 25, 14:25 UTCJul 25, 16:35 UTC2h 10m
2026-07-25 SWA2991 CLE → BWI Jul 25, 10:35 UTCJul 25, 13:00 UTC2h 25m
2026-07-25 SWA2991 CLE → BWI Jul 25, 10:35 UTCJul 25, 12:56 UTC2h 21m
2026-07-25 SWA2134 ISP → TPA Jul 25, 02:40 UTCJul 25, 03:40 UTC1h 0m
2026-07-24 SWA737 BNA → LGA Jul 24, 22:10 UTCJul 25, 01:30 UTC3h 20m
2026-07-24 SWA737 BNA → LGA Jul 24, 19:50 UTCJul 24, 20:40 UTC50m
2026-07-24 SWA4388 DCA → DAL Jul 24, 17:30 UTCJul 24, 18:45 UTC1h 15m
2026-07-24 SWA4655 LAS → SJC Jul 24, 14:20 UTCJul 24, 16:10 UTC1h 50m
2026-07-24 SWA4655 LAS → SJC Jul 24, 14:15 UTCJul 24, 16:09 UTC1h 54m
2026-07-24 SWA440 DAL → MCI Jul 24, 12:05 UTCJul 24, 13:15 UTC1h 10m
2026-07-24 SWA440 DAL → MCI Jul 24, 12:00 UTCJul 24, 13:08 UTC1h 8m
2026-07-24 SWA4829 BWI → LGB Jul 24, 02:35 UTCJul 24, 03:45 UTC1h 10m
2026-07-23 SWA284 ATL → DEN Jul 23, 23:10 UTCJul 24, 01:35 UTC2h 25m
2026-07-23 SWA284 ATL → DEN Jul 23, 21:00 UTCJul 23, 21:55 UTC55m
2026-07-23 SWA4470 DAL → SJC Jul 23, 17:45 UTCJul 23, 19:45 UTC2h 0m
2026-07-23 SWA4470 DAL → SJC Jul 23, 14:40 UTCJul 23, 16:45 UTC2h 5m
2026-07-23 SWA4470 DAL → SJC Jul 23, 11:35 UTCJul 23, 13:10 UTC1h 35m
2026-07-23 SWA2194 PVD → DCA Jul 23, 05:20 UTCJul 23, 06:35 UTC1h 15m
2026-07-23 SWA1566 DEN → HOU Jul 23, 02:35 UTCJul 23, 04:00 UTC1h 25m
2026-07-22 SWA2993 LAX → SFO Jul 22, 23:20 UTCJul 23, 01:20 UTC2h 0m
2026-07-22 SWA3870 PBI → ATL Jul 22, 20:50 UTCJul 22, 21:55 UTC1h 5m
2026-07-22 SWA3870 PBI → ATL Jul 22, 20:49 UTCJul 22, 21:51 UTC1h 2m
2026-07-22 SWA3244 CLT → BWI Jul 22, 18:50 UTCJul 22, 19:45 UTC55m
2026-07-22 SWA3244 CLT → BWI Jul 22, 18:47 UTCJul 22, 19:40 UTC53m
2026-07-22 SWA4155 SJC → DEN Jul 22, 16:45 UTCJul 22, 17:35 UTC50m
2026-07-22 SWA3829 - Jul 22, 13:15 UTCJul 22, 14:25 UTC1h 10m
2026-07-22 SWA2613 BUR → SJC Jul 22, 00:00 UTCJul 22, 04:45 UTC4h 45m
2026-07-21 SWA273 MBJ → MCO Jul 21, 20:50 UTCJul 21, 21:50 UTC1h 0m
2026-07-21 SWA273 MBJ → MCO Jul 21, 20:06 UTCJul 21, 21:45 UTC1h 39m
2026-07-21 SWA272 MCO → MBJ Jul 21, 17:20 UTCJul 21, 18:05 UTC45m
2026-07-21 SWA272 MCO → MBJ Jul 21, 17:17 UTCJul 21, 18:51 UTC1h 34m
2026-07-20 SWA284 - Jul 20, 22:50 UTCJul 21, 01:20 UTC2h 30m
2026-07-20 SWA284 - Jul 20, 20:50 UTCJul 20, 21:50 UTC1h 0m
2026-07-20 SWA4470 DAL → SJC Jul 20, 17:30 UTCJul 20, 19:35 UTC2h 5m
2026-07-20 SWA4470 DAL → SJC Jul 20, 14:25 UTCJul 20, 16:35 UTC2h 10m
2026-07-20 SWA4470 DAL → SJC Jul 20, 11:45 UTCJul 20, 13:20 UTC1h 35m
2026-07-20 SWA3965 ORD → DEN Jul 20, 06:35 UTCJul 20, 07:55 UTC1h 20m
2026-07-20 SWA3965 ORD → DEN Jul 20, 06:35 UTCJul 20, 07:51 UTC1h 16m
2026-07-20 SWA3167 AMA → DAL Jul 20, 04:05 UTCJul 20, 05:30 UTC1h 25m
2026-07-20 SWA2887 - Jul 20, 00:15 UTCJul 20, 02:50 UTC2h 35m

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 N8919K page for operator, model, and routing details .

Mode-S AC4CA8 frequently asked

What is Mode-S code AC4CA8?
AC4CA8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8919K.
Where is Mode-S AC4CA8 registered?
Mode-S code AC4CA8 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 AC4CA8 broadcasting right now?
Yes. Mode-S AC4CA8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4CA8, octal 53046250, decimal 11,291,816.
What flights does AC4CA8 operate?
Mode-S AC4CA8 has broadcast 20 distinct callsigns, including SWA4470, SWA869, SWA2430, SWA1162, SWA3194.