Apparatus

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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
No current signal · last broadcast Jul 26, 22:05 UTC
Flights observed
756
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Last known position

Most recent position reported by Mode-S AC252A.

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
SWA1092 Southwest Airlines 5 2026-07-18
SWA755 Southwest Airlines 4 2026-06-11
SWA709 - 4 2026-06-15
SWA3586 Southwest Airlines 4 2026-06-09
SWA2731 - 4 2026-07-15
SWA2708 Southwest Airlines 4 2026-05-25
SWA2143 Southwest Airlines 4 2026-07-25
SWA1841 Southwest Airlines 4 2026-04-26
SWA1474 - 4 2026-06-30
SWA1266 Southwest Airlines 4 2026-05-20
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
SWA4175 Southwest Airlines 3 2026-07-22
SWA3749 Southwest Airlines 3 2026-04-13
SWA3679 - 3 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA821 BWI → PUJ Jul 26, 16:40 UTCJul 26, 22:05 UTC5h 25m
2026-07-26 SWA3402 DEN → SNA Jul 26, 13:25 UTCJul 26, 14:25 UTC1h 0m
2026-07-26 SWA4821 DEN → MSY Jul 26, 11:15 UTCJul 26, 12:05 UTC50m
2026-07-26 SWA3486 ATL → TPA Jul 26, 04:45 UTCJul 26, 09:20 UTC4h 36m
2026-07-25 SWA211 PHL → DEN Jul 25, 20:50 UTCJul 26, 02:10 UTC5h 20m
2026-07-25 SWA211 PHL → DEN Jul 25, 20:47 UTCJul 26, 02:12 UTC5h 25m
2026-07-25 SWA211 PHL → DEN Jul 25, 18:35 UTCJul 25, 19:30 UTC55m
2026-07-25 SWA2143 PDX → SJC Jul 25, 17:35 UTCJul 25, 17:55 UTC20m
2026-07-25 SWA2143 PDX → SJC Jul 25, 17:25 UTCJul 25, 17:55 UTC30m
2026-07-25 SWA2143 PDX → SJC Jul 25, 16:25 UTCJul 25, 17:20 UTC55m
2026-07-25 SWA2143 PDX → SJC Jul 25, 16:20 UTCJul 25, 17:16 UTC56m
2026-07-25 SWA4691 HOU → OAK Jul 25, 14:40 UTCJul 25, 15:25 UTC45m
2026-07-25 SWA4691 HOU → OAK Jul 25, 14:39 UTCJul 25, 15:23 UTC44m
2026-07-25 SWA967 PDX → OAK Jul 25, 10:40 UTCJul 25, 13:35 UTC2h 55m
2026-07-25 SWA3477 ATL → MSY Jul 25, 04:25 UTCJul 25, 07:00 UTC2h 35m
2026-07-25 SWA4681 MCI → BWI Jul 25, 02:20 UTCJul 25, 03:30 UTC1h 10m
2026-07-24 SWA1101 MDW → CLT Jul 24, 19:20 UTCJul 25, 00:45 UTC5h 25m
2026-07-24 SWA4428 OKC → DEN Jul 24, 17:05 UTCJul 24, 18:05 UTC1h 0m
2026-07-24 SWA4428 OKC → DEN Jul 24, 13:35 UTCJul 24, 16:05 UTC2h 30m
2026-07-24 SWA244 BUR → PHX Jul 24, 11:25 UTCJul 24, 12:25 UTC1h 0m
2026-07-24 SWA1472 PHX → OAK Jul 24, 03:15 UTCJul 24, 05:45 UTC2h 30m
2026-07-23 SWA2252 RNO → LAS Jul 23, 22:20 UTCJul 24, 02:05 UTC3h 45m
2026-07-23 SWA4406 HOU → OAK Jul 23, 19:20 UTCJul 23, 20:45 UTC1h 25m
2026-07-23 SWA4406 HOU → OAK Jul 23, 19:15 UTCJul 23, 20:48 UTC1h 33m
2026-07-23 SWA575 TPA → LGA Jul 23, 16:45 UTCJul 23, 17:55 UTC1h 10m
2026-07-23 SWA3215 ABQ → OAK Jul 23, 13:43 UTCJul 23, 15:25 UTC1h 42m
2026-07-23 SWA3215 ABQ → OAK Jul 23, 13:45 UTCJul 23, 15:25 UTC1h 40m
2026-07-23 SWA2686 BWI → PWM Jul 23, 05:27 UTCJul 23, 08:26 UTC3h 0m
2026-07-23 SWA2686 BWI → PWM Jul 23, 05:30 UTCJul 23, 08:25 UTC2h 55m
2026-07-23 SWA1896 SAN → SJC Jul 23, 01:30 UTCJul 23, 03:20 UTC1h 50m
2026-07-22 SWA1896 SAN → SJC Jul 22, 19:50 UTCJul 22, 21:20 UTC1h 30m
2026-07-22 SWA652 SAN → SMF Jul 22, 17:25 UTCJul 22, 18:25 UTC1h 0m
2026-07-22 SWA4175 BUR → SFO Jul 22, 14:40 UTCJul 22, 16:30 UTC1h 50m
2026-07-22 SWA3565 BOS → MDW Jul 22, 11:25 UTCJul 22, 12:40 UTC1h 15m
2026-07-22 SWA4565 BWI → MDW Jul 22, 02:30 UTCJul 22, 05:25 UTC2h 55m
2026-07-21 SWA2204 PHX → ORD Jul 21, 23:55 UTCJul 22, 00:40 UTC45m
2026-07-21 SWA2204 PHX → ORD Jul 21, 14:30 UTCJul 21, 20:10 UTC5h 40m
2026-07-21 SWA102 DEN → ORD Jul 21, 04:10 UTCJul 21, 06:20 UTC2h 10m
2026-07-21 SWA3208 PHX → AUS Jul 21, 01:20 UTCJul 21, 03:20 UTC2h 0m
2026-07-20 SWA3208 PDX → PHX Jul 20, 21:55 UTCJul 21, 00:25 UTC2h 30m
2026-07-20 SWA4271 DEN → PDX Jul 20, 18:30 UTCJul 20, 20:35 UTC2h 5m
2026-07-20 SWA3145 ISP → BNA Jul 20, 15:15 UTCJul 20, 17:10 UTC1h 55m
2026-07-20 SWA4911 MDW → LAS Jul 20, 13:10 UTCJul 20, 14:10 UTC1h 0m
2026-07-20 SWA3551 - Jul 20, 05:00 UTCJul 20, 06:05 UTC1h 5m
2026-07-20 SWA2675 - Jul 20, 00:45 UTCJul 20, 03:15 UTC2h 30m
2026-07-19 SWA2867 MCI → MCO Jul 19, 22:15 UTCJul 19, 23:45 UTC1h 30m
2026-07-19 SWA2867 MCI → MCO Jul 19, 22:10 UTCJul 19, 23:40 UTC1h 30m
2026-07-19 SWA3969 MCO → MEM Jul 19, 19:20 UTCJul 19, 20:55 UTC1h 35m
2026-07-19 SWA1356 BOS → BWI Jul 19, 16:25 UTCJul 19, 18:05 UTC1h 40m
2026-07-19 SWA2452 - Jul 19, 14:00 UTCJul 19, 15:10 UTC1h 10m

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?
No active broadcast right now. Last signal was Jul 26, 22:05 UTC.
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, SWA1092, SWA755.