Apparatus

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sensors Mode-S transponder

AC5E23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8961K · operated by SOUTHWEST AIRLINES CO

Hex
AC5E23
Octal
53057043
Decimal
11,296,291
Country
US
Tail
N8961K
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
787
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AC5E23.

Country allocation

The ICAO 24-bit address AC5E23 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
SWA1773 Southwest Airlines 7 2026-05-31
SWA1251 - 7 2026-06-20
SWA2149 Southwest Airlines 6 2026-06-01
SWA1721 Southwest Airlines 6 2026-07-19
SWA2926 - 5 2026-06-28
SWA2739 - 5 2026-06-18
SWA211 - 5 2026-07-08
SWA2090 - 5 2026-07-15
SWA2080 Southwest Airlines 5 2026-05-29
SWA939 - 4 2026-07-02
SWA4927 Southwest Airlines 4 2026-06-17
SWA4608 - 4 2026-07-08
SWA2561 - 4 2026-06-26
SWA2153 Southwest Airlines 4 2026-05-31
SWA2148 Southwest Airlines 4 2026-05-26
SWA1970 Southwest Airlines 4 2026-04-15
SWA1838 - 4 2026-07-21
SWA1514 - 4 2026-06-18
SWA777 - 3 2026-07-05
SWA769 Southwest Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2647 OGG → SJC Jul 26, 19:00 UTCJul 26, 21:40 UTC2h 40m
2026-07-26 SWA4175 BUR → SFO Jul 26, 15:45 UTCJul 26, 17:40 UTC1h 55m
2026-07-26 SWA4175 BUR → SFO Jul 26, 15:45 UTCJul 26, 17:35 UTC1h 50m
2026-07-26 SWA2966 ONT → SJC Jul 26, 13:10 UTCJul 26, 14:40 UTC1h 30m
2026-07-26 SWA2966 ONT → SJC Jul 26, 13:10 UTCJul 26, 14:35 UTC1h 25m
2026-07-26 SWA3284 BNA → OAK Jul 26, 05:10 UTCJul 26, 05:55 UTC45m
2026-07-26 SWA3284 BNA → OAK Jul 26, 05:09 UTCJul 26, 05:50 UTC41m
2026-07-26 SWA2314 MDW → PIT Jul 26, 03:05 UTCJul 26, 03:50 UTC45m
2026-07-25 SWA2797 ATL → CLE Jul 25, 22:35 UTCJul 26, 01:50 UTC3h 15m
2026-07-25 SWA2797 ATL → CLE Jul 25, 22:33 UTCJul 26, 01:46 UTC3h 13m
2026-07-25 SWA3596 OAK → SAN Jul 25, 19:31 UTCJul 25, 21:17 UTC1h 46m
2026-07-25 SWA3596 OAK → SAN Jul 25, 19:35 UTCJul 25, 21:25 UTC1h 50m
2026-07-25 SWA1553 BNA → BOS Jul 25, 16:35 UTCJul 25, 18:30 UTC1h 55m
2026-07-25 SWA1553 BNA → BOS Jul 25, 16:31 UTCJul 25, 18:25 UTC1h 54m
2026-07-25 SWA9008 BWI → SYR Jul 25, 03:30 UTCJul 25, 04:10 UTC40m
2026-07-25 SWA3417 LAS → OAK Jul 25, 00:05 UTCJul 25, 02:30 UTC2h 25m
2026-07-24 SWA4411 CMH → DCA Jul 24, 20:45 UTCJul 24, 23:15 UTC2h 30m
2026-07-24 SWA709 SJC → LAX Jul 24, 17:00 UTCJul 24, 19:05 UTC2h 5m
2026-07-24 SWA3749 SMF → LAS Jul 24, 13:10 UTCJul 24, 15:50 UTC2h 40m
2026-07-24 SWA3749 SMF → LAS Jul 24, 13:10 UTCJul 24, 15:42 UTC2h 32m
2026-07-24 SWA1737 HNL → OAK Jul 24, 03:55 UTCJul 24, 05:00 UTC1h 5m
2026-07-24 SWA3913 MSY → LGA Jul 24, 00:45 UTCJul 24, 02:40 UTC1h 55m
2026-07-23 SWA1173 BWI → LGA Jul 23, 21:15 UTCJul 23, 22:45 UTC1h 30m
2026-07-23 SWA1173 BWI → LGA Jul 23, 21:14 UTCJul 23, 22:40 UTC1h 26m
2026-07-23 SWA4343 - Jul 23, 18:30 UTCJul 23, 19:50 UTC1h 20m
2026-07-23 SWA3295 MSP → LAS Jul 23, 13:50 UTCJul 23, 16:55 UTC3h 5m
2026-07-23 SWA1048 SNA → SJC Jul 23, 04:50 UTCJul 23, 07:00 UTC2h 10m
2026-07-23 SWA1048 SNA → SJC Jul 23, 04:46 UTCJul 23, 06:59 UTC2h 13m
2026-07-23 SWA4765 SMF → LAX Jul 23, 00:05 UTCJul 23, 03:55 UTC3h 50m
2026-07-22 SWA3584 BDL → TPA Jul 22, 19:20 UTCJul 22, 21:30 UTC2h 10m
2026-07-22 SWA2499 MDW → BWI Jul 22, 15:45 UTCJul 22, 18:10 UTC2h 25m
2026-07-22 SWA2499 MDW → BWI Jul 22, 15:45 UTCJul 22, 18:06 UTC2h 21m
2026-07-22 SWA153 MAF → DAL Jul 22, 12:55 UTCJul 22, 14:20 UTC1h 25m
2026-07-22 SWA153 MAF → DAL Jul 22, 12:50 UTCJul 22, 14:15 UTC1h 26m
2026-07-22 SWA2177 SAN → OAK Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-22 SWA2177 SAN → OAK Jul 22, 04:47 UTCJul 22, 05:50 UTC1h 3m
2026-07-21 SWA4338 LGB → PHX Jul 21, 23:35 UTCJul 22, 00:40 UTC1h 5m
2026-07-21 SWA843 OAK → BUR Jul 21, 20:59 UTCJul 21, 22:25 UTC1h 26m
2026-07-21 SWA843 OAK → BUR Jul 21, 21:00 UTCJul 21, 22:30 UTC1h 30m
2026-07-21 SWA1838 EUG → SAN Jul 21, 17:50 UTCJul 21, 19:50 UTC2h 0m
2026-07-21 SWA1838 EUG → SAN Jul 21, 17:47 UTCJul 21, 19:46 UTC2h 0m
2026-07-21 SWA1532 BNA → MIA Jul 21, 14:29 UTCJul 21, 16:37 UTC2h 8m
2026-07-21 SWA1532 BNA → MIA Jul 21, 14:30 UTCJul 21, 16:40 UTC2h 10m
2026-07-21 SWA1308 - Jul 21, 09:40 UTCJul 21, 13:05 UTC3h 25m
2026-07-21 SWA1308 PHL → DEN Jul 21, 09:36 UTCJul 21, 13:02 UTC3h 26m
2026-07-21 SWA2686 - Jul 21, 01:20 UTCJul 21, 04:25 UTC3h 5m
2026-07-20 SWA3740 BOI → OAK Jul 20, 23:10 UTCJul 21, 00:15 UTC1h 5m
2026-07-20 SWA3310 LAS → SLC Jul 20, 21:00 UTCJul 20, 21:55 UTC55m
2026-07-20 SWA702 MDW → BOS Jul 20, 18:15 UTCJul 20, 19:45 UTC1h 30m
2026-07-20 SWA2192 STL → DEN Jul 20, 15:45 UTCJul 20, 17:05 UTC1h 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 N8961K page for operator, model, and routing details .

Mode-S AC5E23 frequently asked

What is Mode-S code AC5E23?
AC5E23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8961K.
Where is Mode-S AC5E23 registered?
Mode-S code AC5E23 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 AC5E23 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5E23, octal 53057043, decimal 11,296,291.
What flights does AC5E23 operate?
Mode-S AC5E23 has broadcast 20 distinct callsigns, including SWA1773, SWA1251, SWA2149, SWA1721, SWA2926.