Apparatus

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sensors Mode-S transponder

AC23EF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8810L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC23EF
Octal
53021757
Decimal
11,281,391
Country
US
Tail
N8810L
Type
B38M
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
758
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S AC23EF.

Country allocation

The ICAO 24-bit address AC23EF 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
SWA1240 - 6 2026-07-12
SWA2145 - 5 2026-04-13
SWA2100 Southwest Airlines 5 2026-04-17
SWA1905 Southwest Airlines 5 2026-06-02
SWA1312 - 5 2026-07-13
SWA1296 - 5 2026-07-12
SWA862 Southwest Airlines 4 2026-04-29
SWA428 Southwest Airlines 4 2026-07-20
SWA3796 Southwest Airlines 4 2026-06-03
SWA3795 Southwest Airlines 4 2026-06-01
SWA3457 Southwest Airlines 4 2026-05-27
SWA2418 - 4 2026-07-15
SWA1680 Southwest Airlines 4 2026-04-15
SWA1565 Southwest Airlines 4 2026-05-19
SWA872 Southwest Airlines 3 2026-04-20
SWA647 Southwest Airlines 3 2026-05-20
SWA542 - 3 2026-07-13
SWA512 Southwest Airlines 3 2026-05-18
SWA4877 - 3 2026-07-14
SWA4530 Southwest Airlines 3 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2856 PHX → SAT Jul 26, 20:15 UTCJul 26, 21:35 UTC1h 20m
2026-07-26 SWA4625 BUR → SJC Jul 26, 17:45 UTCJul 26, 18:55 UTC1h 10m
2026-07-26 SWA1232 SJC → LGB Jul 26, 15:30 UTCJul 26, 16:35 UTC1h 5m
2026-07-26 SWA4289 MCO → SJU Jul 26, 13:05 UTCJul 26, 14:20 UTC1h 15m
2026-07-26 SWA430 PHX → MCI Jul 26, 11:10 UTCJul 26, 11:55 UTC45m
2026-07-26 SWA4390 MDW → TPA Jul 26, 01:00 UTCJul 26, 02:17 UTC1h 17m
2026-07-26 SWA4390 MDW → TPA Jul 26, 01:05 UTCJul 26, 02:20 UTC1h 15m
2026-07-25 SWA1859 BDL → BWI Jul 25, 20:55 UTCJul 26, 00:05 UTC3h 10m
2026-07-25 SWA1859 BDL → BWI Jul 25, 20:54 UTCJul 25, 23:56 UTC3h 2m
2026-07-25 SWA2886 ORF → BWI Jul 25, 15:40 UTCJul 25, 19:40 UTC4h 0m
2026-07-25 SWA745 SJC → SEA Jul 25, 12:05 UTCJul 25, 14:05 UTC2h 0m
2026-07-25 SWA459 LAS → BWI Jul 25, 01:55 UTCJul 25, 04:00 UTC2h 5m
2026-07-25 SWA459 LAS → BWI Jul 25, 01:54 UTCJul 25, 03:56 UTC2h 2m
2026-07-24 SWA4344 LAS → SFO Jul 24, 23:35 UTCJul 25, 00:45 UTC1h 10m
2026-07-24 SWA4344 LAS → SFO Jul 24, 23:30 UTCJul 25, 00:38 UTC1h 8m
2026-07-24 SWA2577 MSY → LAX Jul 24, 21:05 UTCJul 24, 22:35 UTC1h 30m
2026-07-24 SWA3009 BNA → MYR Jul 24, 18:05 UTCJul 24, 19:40 UTC1h 35m
2026-07-24 SWA366 BUR → LAS Jul 24, 16:06 UTCJul 24, 17:11 UTC1h 5m
2026-07-24 SWA366 BUR → LAS Jul 24, 16:10 UTCJul 24, 17:10 UTC1h 0m
2026-07-24 SWA4149 DEN → SAT Jul 24, 13:15 UTCJul 24, 15:00 UTC1h 45m
2026-07-24 SWA3418 BUR → LAS Jul 24, 10:50 UTCJul 24, 11:55 UTC1h 5m
2026-07-24 SWA1692 MDW → SMF Jul 24, 02:15 UTCJul 24, 05:05 UTC2h 50m
2026-07-23 SWA3044 PHX → OAK Jul 23, 22:35 UTCJul 24, 00:55 UTC2h 20m
2026-07-23 SWA4928 BHM → BWI Jul 23, 19:55 UTCJul 23, 21:20 UTC1h 25m
2026-07-23 SWA4132 OAK → AUS Jul 23, 17:10 UTCJul 23, 18:50 UTC1h 40m
2026-07-23 SWA1559 PVD → TPA Jul 23, 14:30 UTCJul 23, 15:55 UTC1h 25m
2026-07-23 SWA1186 DAL → ORD Jul 23, 10:10 UTCJul 23, 12:50 UTC2h 40m
2026-07-23 SWA1186 DAL → ORD Jul 23, 10:09 UTCJul 23, 12:46 UTC2h 37m
2026-07-23 SWA4588 BWI → JAX Jul 23, 02:20 UTCJul 23, 04:05 UTC1h 45m
2026-07-23 SWA4588 BWI → JAX Jul 23, 02:18 UTCJul 23, 04:04 UTC1h 46m
2026-07-22 SWA1495 OAK → PHX Jul 22, 20:50 UTCJul 23, 00:00 UTC3h 10m
2026-07-22 SWA3690 STL → SMF Jul 22, 17:45 UTCJul 22, 19:35 UTC1h 50m
2026-07-22 SWA3348 - Jul 22, 15:20 UTCJul 22, 15:45 UTC25m
2026-07-22 SWA3348 ATL → CMH Jul 22, 15:16 UTCJul 22, 16:12 UTC56m
2026-07-22 SWA3815 DAL → PHX Jul 22, 12:35 UTCJul 22, 14:05 UTC1h 30m
2026-07-22 SWA4218 ALB → BWI Jul 22, 02:10 UTCJul 22, 05:10 UTC3h 0m
2026-07-22 SWA4218 ALB → BWI Jul 22, 02:09 UTCJul 22, 05:05 UTC2h 56m
2026-07-21 SWA2255 LAS → BWI Jul 21, 23:40 UTCJul 22, 00:55 UTC1h 15m
2026-07-21 SWA946 AUS → ELP Jul 21, 21:09 UTCJul 21, 22:15 UTC1h 6m
2026-07-21 SWA946 - Jul 21, 21:10 UTCJul 21, 22:05 UTC55m
2026-07-21 SWA1784 BLI → OAK Jul 21, 17:55 UTCJul 21, 19:30 UTC1h 35m
2026-07-21 SWA1784 BLI → OAK Jul 21, 17:53 UTCJul 21, 19:26 UTC1h 33m
2026-07-21 SWA3032 LAS → OAK Jul 21, 15:05 UTCJul 21, 16:40 UTC1h 35m
2026-07-21 SWA113 - Jul 21, 00:30 UTCJul 21, 01:55 UTC1h 25m
2026-07-21 SWA113 ABQ → DAL Jul 21, 00:27 UTCJul 21, 01:51 UTC1h 24m
2026-07-20 SWA3660 SAN → SJC Jul 20, 22:20 UTCJul 20, 23:35 UTC1h 15m
2026-07-20 SWA3660 SAN → SJC Jul 20, 18:50 UTCJul 20, 21:15 UTC2h 25m
2026-07-20 SWA2559 PHX → OAK Jul 20, 14:50 UTCJul 20, 17:20 UTC2h 30m
2026-07-20 SWA2559 PHX → OAK Jul 20, 12:10 UTCJul 20, 13:40 UTC1h 30m
2026-07-20 SWA3024 MSY → DEN Jul 20, 04:15 UTCJul 20, 06:35 UTC2h 20m

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 N8810L page for operator, model, and routing details .

Mode-S AC23EF frequently asked

What is Mode-S code AC23EF?
AC23EF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8810L.
Where is Mode-S AC23EF registered?
Mode-S code AC23EF 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 AC23EF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC23EF, octal 53021757, decimal 11,281,391.
What flights does AC23EF operate?
Mode-S AC23EF has broadcast 20 distinct callsigns, including SWA1240, SWA2145, SWA2100, SWA1905, SWA1312.