Apparatus

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sensors Mode-S transponder

AC250B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8818Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC250B
Octal
53022413
Decimal
11,281,675
Country
US
Tail
N8818Q
Type
B38M
No current signal · last broadcast Jul 26, 22:25 UTC
Flights observed
769
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:25 UTC

Last known position

Most recent position reported by Mode-S AC250B.

Country allocation

The ICAO 24-bit address AC250B 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
SWA869 Southwest Airlines 6 2026-04-17
SWA935 Southwest Airlines 5 2026-04-13
SWA1355 Southwest Airlines 5 2026-07-22
SWA451 - 4 2026-06-21
SWA3890 - 4 2026-07-02
SWA365 - 4 2026-06-27
SWA3575 Southwest Airlines 4 2026-06-19
SWA3521 Southwest Airlines 4 2026-05-18
SWA3217 - 4 2026-06-26
SWA2876 - 4 2026-07-11
SWA2499 - 4 2026-06-27
SWA943 Southwest Airlines 3 2026-05-20
SWA732 Southwest Airlines 3 2026-04-20
SWA724 Southwest Airlines 3 2026-07-04
SWA699 Southwest Airlines 3 2026-04-20
SWA680 - 3 2026-06-13
SWA4748 Southwest Airlines 3 2026-06-19
SWA4195 Southwest Airlines 3 2026-04-15
SWA3918 - 3 2026-06-27
SWA3813 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3496 DEN → MCO Jul 26, 20:25 UTCJul 26, 22:20 UTC1h 55m
2026-07-26 SWA4811 OAK → BUR Jul 26, 18:00 UTCJul 26, 19:05 UTC1h 5m
2026-07-26 SWA2079 LAS → OAK Jul 26, 13:35 UTCJul 26, 16:50 UTC3h 15m
2026-07-26 SWA4430 OAK → SNA Jul 26, 10:20 UTCJul 26, 11:50 UTC1h 30m
2026-07-26 SWA4507 AUS → OAK Jul 26, 02:10 UTCJul 26, 04:45 UTC2h 35m
2026-07-26 SWA4507 AUS → OAK Jul 26, 02:10 UTCJul 26, 05:00 UTC2h 50m
2026-07-25 SWA746 LGA → MCI Jul 25, 21:55 UTCJul 26, 01:10 UTC3h 15m
2026-07-25 SWA746 LGA → MCI Jul 25, 18:45 UTCJul 25, 20:45 UTC2h 0m
2026-07-25 SWA4560 PHX → SJC Jul 25, 15:35 UTCJul 25, 17:35 UTC2h 0m
2026-07-25 SWA4560 PHX → SJC Jul 25, 15:34 UTCJul 25, 17:34 UTC2h 0m
2026-07-25 SWA3108 BNA → PHL Jul 25, 12:35 UTCJul 25, 14:05 UTC1h 30m
2026-07-25 SWA3108 BNA → PHL Jul 25, 12:32 UTCJul 25, 13:59 UTC1h 27m
2026-07-25 SWA608 SFO → SAN Jul 25, 03:35 UTCJul 25, 05:00 UTC1h 25m
2026-07-25 SWA3025 SAN → AUS Jul 25, 01:20 UTCJul 25, 02:25 UTC1h 5m
2026-07-25 SWA3025 SAN → AUS Jul 25, 01:10 UTCJul 25, 02:20 UTC1h 10m
2026-07-24 SWA4304 RSW → ALB Jul 24, 21:20 UTCJul 25, 00:00 UTC2h 40m
2026-07-24 SWA4304 RSW → ALB Jul 24, 21:18 UTCJul 25, 00:05 UTC2h 47m
2026-07-24 SWA1770 BWI → CVG Jul 24, 18:45 UTCJul 24, 20:10 UTC1h 25m
2026-07-24 SWA1770 BWI → CVG Jul 24, 18:41 UTCJul 24, 20:00 UTC1h 19m
2026-07-24 SWA1524 SEA → SMF Jul 24, 16:32 UTCJul 24, 17:44 UTC1h 12m
2026-07-24 SWA1524 SEA → SMF Jul 24, 16:35 UTCJul 24, 17:50 UTC1h 15m
2026-07-24 SWA3195 ONT → OAK Jul 24, 13:10 UTCJul 24, 15:05 UTC1h 55m
2026-07-24 SWA3195 ONT → OAK Jul 24, 13:02 UTCJul 24, 15:00 UTC1h 58m
2026-07-24 SWA2852 PHX → SFO Jul 24, 02:50 UTCJul 24, 06:45 UTC3h 55m
2026-07-24 SWA1251 OAK → BUR Jul 24, 00:30 UTCJul 24, 01:10 UTC40m
2026-07-23 SWA1251 OAK → BUR Jul 23, 21:25 UTCJul 23, 23:30 UTC2h 5m
2026-07-23 SWA3069 LAS → SJC Jul 23, 18:10 UTCJul 23, 20:05 UTC1h 55m
2026-07-23 SWA3069 LAS → SJC Jul 23, 18:06 UTCJul 23, 19:59 UTC1h 54m
2026-07-23 SWA956 LAX → SJC Jul 23, 14:20 UTCJul 23, 17:00 UTC2h 40m
2026-07-23 SWA956 LAX → SJC Jul 23, 14:15 UTCJul 23, 17:00 UTC2h 45m
2026-07-23 SWA2985 SJC → BUR Jul 23, 11:00 UTCJul 23, 13:10 UTC2h 10m
2026-07-23 SWA2985 SJC → BUR Jul 23, 10:56 UTCJul 23, 13:10 UTC2h 15m
2026-07-22 SWA4567 PHX → SLC Jul 22, 23:40 UTCJul 23, 02:00 UTC2h 20m
2026-07-22 SWA4567 PHX → SLC Jul 22, 23:40 UTCJul 23, 01:51 UTC2h 11m
2026-07-22 SWA3329 MCI → MCO Jul 22, 20:35 UTCJul 22, 22:00 UTC1h 25m
2026-07-22 SWA3329 MCI → MCO Jul 22, 16:30 UTCJul 22, 19:30 UTC3h 0m
2026-07-22 SWA117 SJC → LAS Jul 22, 12:05 UTCJul 22, 15:10 UTC3h 5m
2026-07-22 SWA117 SJC → LAS Jul 22, 12:01 UTCJul 22, 15:09 UTC3h 9m
2026-07-22 SWA2521 OAK → BLI Jul 22, 03:05 UTCJul 22, 05:25 UTC2h 20m
2026-07-22 SWA1355 PHX → SJC Jul 22, 00:00 UTCJul 22, 02:00 UTC2h 0m
2026-07-21 SWA1355 PHX → SJC Jul 21, 20:05 UTCJul 21, 22:40 UTC2h 35m
2026-07-21 SWA1355 PHX → SJC Jul 21, 16:30 UTCJul 21, 18:45 UTC2h 15m
2026-07-21 SWA1355 PHX → SJC Jul 21, 13:50 UTCJul 21, 15:20 UTC1h 30m
2026-07-21 SWA3802 PHX → PIT Jul 21, 07:30 UTCJul 21, 10:55 UTC3h 25m
2026-07-21 SWA4921 PHX → MCO Jul 21, 04:25 UTCJul 21, 05:25 UTC1h 0m
2026-07-21 SWA4921 PHX → MCO Jul 21, 04:23 UTCJul 21, 05:23 UTC1h 0m
2026-07-20 SWA188 BWI → FLL Jul 20, 23:50 UTCJul 21, 03:30 UTC3h 40m
2026-07-20 SWA3202 SJC → PDX Jul 20, 19:10 UTCJul 20, 22:30 UTC3h 20m
2026-07-20 SWA1667 BNA → PHL Jul 20, 15:55 UTCJul 20, 18:00 UTC2h 5m
2026-07-20 SWA1424 BWI → BDL Jul 20, 12:20 UTCJul 20, 14:30 UTC2h 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 N8818Q page for operator, model, and routing details .

Mode-S AC250B frequently asked

What is Mode-S code AC250B?
AC250B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8818Q.
Where is Mode-S AC250B registered?
Mode-S code AC250B 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 AC250B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC250B, octal 53022413, decimal 11,281,675.
What flights does AC250B operate?
Mode-S AC250B has broadcast 20 distinct callsigns, including SWA869, SWA935, SWA1355, SWA451, SWA3890.