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sensors Mode-S transponder

AC5B66

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8958Q · operated by SOUTHWEST AIRLINES CO

Hex
AC5B66
Octal
53055546
Decimal
11,295,590
Country
US
Tail
N8958Q
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
686
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AC5B66.

Country allocation

The ICAO 24-bit address AC5B66 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
SWA3165 Southwest Airlines 8 2026-04-21
SWA1517 Southwest Airlines 5 2026-06-09
SWA147 - 5 2026-07-06
SWA869 Southwest Airlines 4 2026-06-02
SWA2965 - 4 2026-07-12
SWA2958 Southwest Airlines 4 2026-06-14
SWA2685 Southwest Airlines 4 2026-05-30
SWA2589 - 4 2026-06-27
SWA1928 Southwest Airlines 4 2026-05-13
SWA1474 Southwest Airlines 4 2026-05-13
SWA1346 - 4 2026-07-11
SWA1142 - 4 2026-06-25
SWA1096 Southwest Airlines 4 2026-06-07
SWA958 Southwest Airlines 3 2026-05-31
SWA905 Southwest Airlines 3 2026-05-18
SWA660 Southwest Airlines 3 2026-06-12
SWA645 Southwest Airlines 3 2026-06-01
SWA551 - 3 2026-06-20
SWA540 Southwest Airlines 3 2026-06-08
SWA490 - 3 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SWA2380 - Jul 15, 03:15 UTCJul 15, 05:45 UTC2h 30m
2026-07-14 SWA3004 - Jul 14, 22:30 UTCJul 15, 02:05 UTC3h 34m
2026-07-14 SWA3004 MCO → MSY Jul 14, 20:00 UTCJul 14, 21:25 UTC1h 25m
2026-07-14 SWA1817 - Jul 14, 15:00 UTCJul 14, 18:55 UTC3h 55m
2026-07-14 SWA1817 PHX → MCO Jul 14, 14:57 UTCJul 14, 18:51 UTC3h 55m
2026-07-14 SWA3450 - Jul 14, 12:10 UTCJul 14, 13:35 UTC1h 25m
2026-07-14 SWA1696 - Jul 14, 04:10 UTCJul 14, 05:25 UTC1h 15m
2026-07-14 SWA1696 DEN → RNO Jul 14, 04:10 UTCJul 14, 05:56 UTC1h 46m
2026-07-14 SWA4151 - Jul 14, 01:15 UTCJul 14, 03:10 UTC1h 55m
2026-07-13 SWA2883 MDW → SAN Jul 13, 20:35 UTCJul 14, 00:00 UTC3h 25m
2026-07-13 SWA2883 MDW → SAN Jul 13, 20:35 UTCJul 13, 23:59 UTC3h 25m
2026-07-13 SWA755 - Jul 13, 17:05 UTCJul 13, 19:10 UTC2h 5m
2026-07-13 SWA3169 - Jul 13, 13:45 UTCJul 13, 15:00 UTC1h 15m
2026-07-13 SWA358 - Jul 13, 10:20 UTCJul 13, 12:25 UTC2h 5m
2026-07-13 SWA1295 DAL → DCA Jul 13, 04:55 UTCJul 13, 07:35 UTC2h 40m
2026-07-12 SWA1839 - Jul 12, 22:10 UTCJul 13, 00:35 UTC2h 25m
2026-07-12 SWA1839 MYR → DAL Jul 12, 22:04 UTCJul 13, 00:26 UTC2h 23m
2026-07-12 SWA4304 - Jul 12, 18:01 UTCJul 12, 20:50 UTC2h 50m
2026-07-12 SWA2965 - Jul 12, 15:01 UTCJul 12, 16:25 UTC1h 25m
2026-07-12 SWA2965 MSP → DEN Jul 12, 14:58 UTCJul 12, 16:24 UTC1h 26m
2026-07-12 SWA1243 - Jul 12, 12:55 UTCJul 12, 13:50 UTC55m
2026-07-12 SWA3649 SFO → MDW Jul 12, 07:10 UTCJul 12, 10:55 UTC3h 45m
2026-07-12 SWA4303 DEN → SFO Jul 12, 03:27 UTCJul 12, 05:33 UTC2h 6m
2026-07-12 SWA4303 - Jul 12, 03:30 UTCJul 12, 05:35 UTC2h 5m
2026-07-12 SWA2829 - Jul 12, 00:15 UTCJul 12, 01:35 UTC1h 20m
2026-07-11 SWA4635 - Jul 11, 22:01 UTCJul 11, 23:10 UTC1h 10m
2026-07-11 SWA1346 DAL → DEN Jul 11, 19:20 UTCJul 11, 20:55 UTC1h 35m
2026-07-11 SWA4759 - Jul 11, 16:45 UTCJul 11, 17:50 UTC1h 5m
2026-07-11 SWA265 - Jul 11, 14:05 UTCJul 11, 15:40 UTC1h 35m
2026-07-11 SWA1261 DAL → ATL Jul 11, 11:15 UTCJul 11, 12:50 UTC1h 35m
2026-07-11 SWA64 - Jul 11, 04:40 UTCJul 11, 05:20 UTC40m
2026-07-11 SWA3136 - Jul 11, 02:05 UTCJul 11, 03:45 UTC1h 40m
2026-07-10 SWA449 - Jul 10, 22:00 UTCJul 10, 23:50 UTC1h 50m
2026-07-10 SWA449 JAX → STL Jul 10, 21:58 UTCJul 10, 23:52 UTC1h 55m
2026-07-10 SWA542 - Jul 10, 19:55 UTCJul 10, 21:05 UTC1h 10m
2026-07-10 SWA2605 MCO → BNA Jul 10, 16:35 UTCJul 10, 18:15 UTC1h 40m
2026-07-10 SWA2130 - Jul 10, 13:20 UTCJul 10, 15:05 UTC1h 45m
2026-07-10 SWA331 TPA → IND Jul 10, 10:20 UTCJul 10, 12:15 UTC1h 55m
2026-07-10 SWA4619 - Jul 10, 02:40 UTCJul 10, 04:45 UTC2h 5m
2026-07-09 SWA2679 - Jul 9, 23:55 UTCJul 10, 01:45 UTC1h 50m
2026-07-09 SWA2679 PHL → PHL Jul 9, 23:10 UTCJul 9, 23:15 UTC5m
2026-07-09 SWA2679 - Jul 9, 20:20 UTCJul 9, 22:20 UTC2h 0m
2026-07-09 SWA349 AUS → MCO Jul 9, 15:40 UTCJul 9, 17:55 UTC2h 15m
2026-07-09 SWA2977 MSY → AUS Jul 9, 13:25 UTCJul 9, 14:30 UTC1h 5m
2026-07-09 SWA2977 MSY → AUS Jul 9, 13:23 UTCJul 9, 14:30 UTC1h 7m
2026-07-09 SWA1466 - Jul 9, 11:15 UTCJul 9, 12:20 UTC1h 5m
2026-07-09 SWA2260 - Jul 9, 04:20 UTCJul 9, 05:30 UTC1h 10m
2026-07-09 SWA2260 ELP → DAL Jul 9, 04:07 UTCJul 9, 05:30 UTC1h 23m
2026-07-09 SWA1530 - Jul 9, 02:05 UTCJul 9, 03:10 UTC1h 5m
2026-07-08 SWA1139 - Jul 8, 17:00 UTCJul 9, 00:55 UTC7h 55m

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 N8958Q page for operator, model, and routing details .

Mode-S AC5B66 frequently asked

What is Mode-S code AC5B66?
AC5B66 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8958Q.
Where is Mode-S AC5B66 registered?
Mode-S code AC5B66 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 AC5B66 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5B66, octal 53055546, decimal 11,295,590.
What flights does AC5B66 operate?
Mode-S AC5B66 has broadcast 20 distinct callsigns, including SWA3165, SWA1517, SWA147, SWA869, SWA2965.