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sensors Mode-S transponder

AC252A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8819L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC252A
Octal
53022452
Decimal
11,281,706
Country
US
Tail
N8819L
Type
B38M
Broadcasting now · callsign SWA365 · 28,575 ft
Flights observed
661
Distinct callsigns
20
Country
US
Last broadcast
32m ago

Current position

AC252A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC252A 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
SWA241 Southwest Airlines 5 2026-05-30
SWA1970 Southwest Airlines 5 2026-06-14
SWA1098 - 5 2026-07-10
SWA755 Southwest Airlines 4 2026-06-11
SWA709 - 4 2026-06-15
SWA3586 Southwest Airlines 4 2026-06-09
SWA2708 Southwest Airlines 4 2026-05-25
SWA1841 Southwest Airlines 4 2026-04-26
SWA1474 - 4 2026-06-30
SWA1266 Southwest Airlines 4 2026-05-20
SWA1092 Southwest Airlines 4 2026-04-17
SWA636 Southwest Airlines 3 2026-05-25
SWA579 - 3 2026-06-23
SWA4638 Southwest Airlines 3 2026-04-18
SWA4514 Southwest Airlines 3 2026-06-08
SWA3749 Southwest Airlines 3 2026-04-13
SWA366 Southwest Airlines 3 2026-05-18
SWA3372 Southwest Airlines 3 2026-04-14
SWA3294 Southwest Airlines 3 2026-05-06
SWA3263 Southwest Airlines 3 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA3018 MSY → SAN Jul 14, 00:15 UTCJul 14, 03:30 UTC3h 15m
2026-07-13 SWA4038 TPA → MSY Jul 13, 21:25 UTCJul 13, 22:45 UTC1h 20m
2026-07-13 SWA4038 TPA → MSY Jul 13, 21:26 UTCJul 13, 22:43 UTC1h 17m
2026-07-13 SWA4511 - Jul 13, 16:05 UTCJul 13, 20:30 UTC4h 25m
2026-07-13 SWA3103 - Jul 13, 11:00 UTCJul 13, 14:25 UTC3h 25m
2026-07-13 SWA4169 - Jul 13, 01:01 UTCJul 13, 04:10 UTC3h 10m
2026-07-12 SWA1531 - Jul 12, 20:25 UTCJul 12, 23:20 UTC2h 55m
2026-07-12 SWA3224 PHL → MDW Jul 12, 17:25 UTCJul 12, 19:01 UTC1h 35m
2026-07-12 SWA3224 PHL → MDW Jul 12, 17:24 UTCJul 12, 18:59 UTC1h 36m
2026-07-12 SWA4329 - Jul 12, 13:25 UTCJul 12, 16:10 UTC2h 45m
2026-07-12 SWA2517 - Jul 12, 10:45 UTCJul 12, 11:25 UTC40m
2026-07-12 SWA3136 - Jul 12, 02:45 UTCJul 12, 03:25 UTC40m
2026-07-12 SWA3136 DAL → LIT Jul 12, 02:43 UTCJul 12, 03:31 UTC48m
2026-07-11 SWA3772 - Jul 11, 22:15 UTCJul 12, 01:15 UTC3h 0m
2026-07-11 SWA1741 DEN → SMF Jul 11, 19:00 UTCJul 11, 20:55 UTC1h 55m
2026-07-11 SWA2965 MSP → DEN Jul 11, 15:55 UTCJul 11, 17:30 UTC1h 35m
2026-07-11 SWA2160 - Jul 11, 13:10 UTCJul 11, 14:55 UTC1h 45m
2026-07-11 SWA2160 BNA → MSP Jul 11, 13:10 UTCJul 11, 14:49 UTC1h 39m
2026-07-11 SWA1167 - Jul 11, 10:45 UTCJul 11, 11:40 UTC55m
2026-07-11 SWA1167 CLT → BNA Jul 11, 10:45 UTCJul 11, 11:36 UTC51m
2026-07-11 SWA4518 - Jul 11, 02:15 UTCJul 11, 03:01 UTC45m
2026-07-11 SWA1073 - Jul 11, 00:00 UTCJul 11, 00:55 UTC55m
2026-07-10 SWA3202 - Jul 10, 19:25 UTCJul 10, 22:55 UTC3h 30m
2026-07-10 SWA3202 PDX → MDW Jul 10, 19:24 UTCJul 10, 22:52 UTC3h 29m
2026-07-10 SWA1667 DEN → PDX Jul 10, 16:05 UTCJul 10, 18:10 UTC2h 5m
2026-07-10 SWA1667 DEN → PDX Jul 10, 16:05 UTCJul 10, 18:15 UTC2h 10m
2026-07-10 SWA1424 - Jul 10, 12:35 UTCJul 10, 14:30 UTC1h 55m
2026-07-10 SWA1098 PHX → SFO Jul 10, 06:15 UTCJul 10, 07:45 UTC1h 30m
2026-07-10 SWA3857 - Jul 10, 03:55 UTCJul 10, 04:50 UTC55m
2026-07-10 SWA3834 - Jul 10, 01:45 UTCJul 10, 02:55 UTC1h 10m
2026-07-10 SWA3834 SMF → SNA Jul 10, 01:42 UTCJul 10, 02:50 UTC1h 8m
2026-07-09 SWA4897 - Jul 9, 23:40 UTCJul 10, 00:40 UTC1h 0m
2026-07-09 SWA3061 - Jul 9, 22:05 UTCJul 9, 22:50 UTC45m
2026-07-09 SWA3061 - Jul 9, 18:30 UTCJul 9, 20:45 UTC2h 15m
2026-07-09 SWA2939 - Jul 9, 15:10 UTCJul 9, 17:05 UTC1h 55m
2026-07-09 SWA4775 STL → MKE Jul 9, 13:20 UTCJul 9, 14:10 UTC50m
2026-07-09 SWA682 - Jul 9, 03:25 UTCJul 9, 04:10 UTC45m
2026-07-09 SWA1067 - Jul 9, 00:00 UTCJul 9, 01:55 UTC1h 55m
2026-07-08 SWA1067 RDU → AUS Jul 8, 23:59 UTCJul 9, 01:49 UTC1h 50m
2026-07-08 SWA4899 - Jul 8, 20:00 UTCJul 8, 22:35 UTC2h 35m
2026-07-08 SWA507 - Jul 8, 18:00 UTCJul 8, 18:40 UTC40m
2026-07-08 SWA507 - Jul 8, 15:35 UTCJul 8, 16:45 UTC1h 10m
2026-07-08 SWA3557 - Jul 8, 12:20 UTCJul 8, 14:10 UTC1h 50m
2026-07-07 SWA614 - Jul 7, 23:20 UTCJul 8, 02:30 UTC3h 10m
2026-07-07 SWA1982 LAS → BWI Jul 7, 18:05 UTCJul 7, 22:20 UTC4h 15m
2026-07-07 SWA347 SJC → SNA Jul 7, 13:15 UTCJul 7, 16:25 UTC3h 10m
2026-07-07 SWA347 SJC → SNA Jul 7, 10:20 UTCJul 7, 12:05 UTC1h 45m
2026-07-07 SWA597 - Jul 7, 05:15 UTCJul 7, 06:25 UTC1h 10m
2026-07-07 SWA597 BNA → MSY Jul 7, 05:11 UTCJul 7, 06:23 UTC1h 12m
2026-07-07 SWA3462 RSW → BNA Jul 7, 01:45 UTCJul 7, 03:20 UTC1h 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 N8819L page for operator, model, and routing details .

Mode-S AC252A frequently asked

What is Mode-S code AC252A?
AC252A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8819L.
Where is Mode-S AC252A registered?
Mode-S code AC252A 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 AC252A broadcasting right now?
Yes. Mode-S AC252A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC252A, octal 53022452, decimal 11,281,706.
What flights does AC252A operate?
Mode-S AC252A has broadcast 20 distinct callsigns, including SWA241, SWA1970, SWA1098, SWA755, SWA709.