Apparatus

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sensors Mode-S transponder

AC2FA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8844Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC2FA4
Octal
53027644
Decimal
11,284,388
Country
US
Tail
N8844Q
Type
B38M
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
734
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AC2FA4.

Country allocation

The ICAO 24-bit address AC2FA4 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
SWA3645 Southwest Airlines 5 2026-05-24
SWA1355 - 5 2026-06-26
SWA935 Southwest Airlines 4 2026-07-06
SWA4331 - 4 2026-07-10
SWA200 - 4 2026-06-20
SWA803 Southwest Airlines 3 2026-04-18
SWA657 Southwest Airlines 3 2026-05-30
SWA519 Southwest Airlines 3 2026-06-07
SWA509 Southwest Airlines 3 2026-05-09
SWA494 Southwest Airlines 3 2026-05-25
SWA4845 - 3 2026-07-10
SWA449 Southwest Airlines 3 2026-05-20
SWA4215 Southwest Airlines 3 2026-04-17
SWA360 Southwest Airlines 3 2026-05-06
SWA3521 - 3 2026-04-13
SWA3475 Southwest Airlines 3 2026-07-20
SWA2863 Southwest Airlines 3 2026-05-16
SWA2708 Southwest Airlines 3 2026-07-23
SWA2702 - 3 2026-07-12
SWA2640 Southwest Airlines 3 2026-04-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA899 DEN → TPA Jul 26, 19:15 UTCJul 26, 22:25 UTC3h 10m
2026-07-26 SWA899 DEN → TPA Jul 26, 15:55 UTCJul 26, 17:05 UTC1h 10m
2026-07-26 SWA1487 FLL → PIT Jul 26, 11:50 UTCJul 26, 14:50 UTC3h 0m
2026-07-26 SWA4152 BNA → HOU Jul 26, 06:03 UTCJul 26, 07:57 UTC1h 55m
2026-07-26 SWA4152 BNA → HOU Jul 26, 06:05 UTCJul 26, 08:00 UTC1h 56m
2026-07-26 SWA2696 DAL → SAN Jul 26, 00:58 UTCJul 26, 05:08 UTC4h 10m
2026-07-26 SWA2696 DAL → SAN Jul 26, 01:00 UTCJul 26, 05:15 UTC4h 15m
2026-07-25 SWA3242 SFO → LAS Jul 25, 21:45 UTCJul 25, 23:10 UTC1h 25m
2026-07-25 SWA2280 DAL → AUS Jul 25, 16:15 UTCJul 25, 19:25 UTC3h 10m
2026-07-25 SWA2280 DAL → AUS Jul 25, 16:11 UTCJul 25, 19:20 UTC3h 9m
2026-07-25 SWA1311 BWI → ALB Jul 25, 11:10 UTCJul 25, 14:40 UTC3h 30m
2026-07-25 SWA447 OAK → LGB Jul 25, 04:10 UTCJul 25, 04:45 UTC35m
2026-07-25 SWA3217 BWI → CVG Jul 25, 00:40 UTCJul 25, 02:20 UTC1h 40m
2026-07-25 SWA3217 BWI → CVG Jul 25, 00:39 UTCJul 25, 02:16 UTC1h 37m
2026-07-24 SWA3286 LGB → SJC Jul 24, 20:40 UTCJul 24, 23:35 UTC2h 55m
2026-07-24 SWA3399 SNA → OAK Jul 24, 17:45 UTCJul 24, 19:27 UTC1h 42m
2026-07-24 SWA3399 SNA → OAK Jul 24, 17:45 UTCJul 24, 19:30 UTC1h 45m
2026-07-24 SWA2363 BNA → BOS Jul 24, 13:15 UTCJul 24, 16:20 UTC3h 5m
2026-07-24 SWA2363 BNA → BOS Jul 24, 13:13 UTCJul 24, 16:16 UTC3h 3m
2026-07-24 SWA3337 SJC → PDX Jul 24, 03:30 UTCJul 24, 04:50 UTC1h 20m
2026-07-24 SWA711 BNA → LGA Jul 24, 00:40 UTCJul 24, 02:15 UTC1h 35m
2026-07-23 SWA2737 BWI → MKE Jul 23, 20:15 UTCJul 23, 23:20 UTC3h 5m
2026-07-23 SWA427 DCA → MSY Jul 23, 16:45 UTCJul 23, 18:40 UTC1h 55m
2026-07-23 SWA427 DCA → MSY Jul 23, 15:00 UTCJul 23, 15:40 UTC40m
2026-07-23 SWA3717 PDX → SJC Jul 23, 11:40 UTCJul 23, 13:30 UTC1h 50m
2026-07-23 SWA3717 PDX → SJC Jul 23, 09:50 UTCJul 23, 10:05 UTC15m
2026-07-23 SWA2708 SEA → OAK Jul 23, 04:15 UTCJul 23, 04:35 UTC20m
2026-07-23 SWA2708 SEA → OAK Jul 23, 02:00 UTCJul 23, 02:35 UTC35m
2026-07-23 SWA2708 SEA → OAK Jul 23, 01:58 UTCJul 23, 04:30 UTC2h 32m
2026-07-22 SWA2817 DEN → MTJ Jul 22, 22:00 UTCJul 23, 00:00 UTC2h 0m
2026-07-22 SWA2817 DEN → MTJ Jul 22, 21:58 UTCJul 22, 23:50 UTC1h 52m
2026-07-22 SWA3296 BWI → PVD Jul 22, 17:55 UTCJul 22, 20:40 UTC2h 45m
2026-07-22 SWA3770 PHX → SJC Jul 22, 13:25 UTCJul 22, 16:30 UTC3h 5m
2026-07-22 SWA3770 PHX → SJC Jul 22, 13:24 UTCJul 22, 16:30 UTC3h 6m
2026-07-22 SWA2348 LAX → OAK Jul 22, 03:40 UTCJul 22, 04:35 UTC55m
2026-07-22 SWA2348 LAX → OAK Jul 22, 03:36 UTCJul 22, 04:33 UTC57m
2026-07-21 SWA2348 LAX → OAK Jul 21, 21:55 UTCJul 22, 02:25 UTC4h 30m
2026-07-21 SWA1154 - Jul 21, 12:05 UTCJul 21, 19:10 UTC7h 5m
2026-07-21 SWA3480 BWI → CMH Jul 21, 06:25 UTCJul 21, 10:05 UTC3h 40m
2026-07-21 SWA2580 BWI → RSW Jul 21, 04:30 UTCJul 21, 05:20 UTC50m
2026-07-21 SWA2580 BWI → RSW Jul 21, 00:10 UTCJul 21, 02:35 UTC2h 25m
2026-07-20 SWA1587 LAS → SJC Jul 20, 21:35 UTCJul 20, 22:40 UTC1h 5m
2026-07-20 SWA753 MDW → PVD Jul 20, 18:40 UTCJul 20, 20:20 UTC1h 40m
2026-07-20 SWA753 MDW → PVD Jul 20, 18:39 UTCJul 20, 20:22 UTC1h 44m
2026-07-20 SWA3475 SNA → OAK Jul 20, 15:10 UTCJul 20, 17:35 UTC2h 25m
2026-07-20 SWA1393 SJC → AUS Jul 20, 11:35 UTCJul 20, 13:55 UTC2h 20m
2026-07-20 SWA1393 SJC → AUS Jul 20, 11:30 UTCJul 20, 13:53 UTC2h 23m
2026-07-20 SWA1393 SJC → AUS Jul 20, 11:15 UTCJul 20, 11:25 UTC10m
2026-07-20 SWA1523 DEN → DAL Jul 20, 03:20 UTCJul 20, 04:50 UTC1h 30m
2026-07-19 SWA2252 RNO → LAS Jul 19, 21:35 UTCJul 20, 01:05 UTC3h 30m

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 N8844Q page for operator, model, and routing details .

Mode-S AC2FA4 frequently asked

What is Mode-S code AC2FA4?
AC2FA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8844Q.
Where is Mode-S AC2FA4 registered?
Mode-S code AC2FA4 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 AC2FA4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC2FA4, octal 53027644, decimal 11,284,388.
What flights does AC2FA4 operate?
Mode-S AC2FA4 has broadcast 20 distinct callsigns, including SWA3645, SWA1355, SWA935, SWA4331, SWA200.