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sensors Mode-S transponder

AC37BD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8869L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC37BD
Octal
53033675
Decimal
11,286,461
Country
US
Tail
N8869L
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
651
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AC37BD.

Country allocation

The ICAO 24-bit address AC37BD 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
SWA852 Southwest Airlines 5 2026-04-18
SWA3203 Southwest Airlines 5 2026-06-05
SWA1733 - 5 2026-07-05
SWA3346 Southwest Airlines 4 2026-04-22
SWA2935 - 4 2026-07-05
SWA2307 Southwest Airlines 4 2026-06-13
SWA1945 Southwest Airlines 4 2026-05-18
SWA1739 Southwest Airlines 4 2026-04-29
SWA1421 Southwest Airlines 4 2026-05-12
SWA784 - 3 2026-07-09
SWA779 Southwest Airlines 3 2026-04-16
SWA591 - 3 2026-07-12
SWA590 - 3 2026-06-23
SWA4528 Southwest Airlines 3 2026-05-10
SWA4365 - 3 2026-07-14
SWA4117 - 3 2026-07-09
SWA3599 Southwest Airlines 3 2026-06-13
SWA3590 - 3 2026-07-09
SWA323 Southwest Airlines 3 2026-05-24
SWA3212 - 3 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SWA441 - Jul 15, 02:45 UTCJul 15, 03:45 UTC1h 0m
2026-07-14 SWA2593 DCA → AUS Jul 14, 22:40 UTCJul 15, 01:35 UTC2h 54m
2026-07-14 SWA1241 LAS → DCA Jul 14, 16:40 UTCJul 14, 21:05 UTC4h 25m
2026-07-14 SWA1241 SMF → LAS Jul 14, 14:15 UTCJul 14, 15:20 UTC1h 5m
2026-07-14 SWA4365 - Jul 14, 02:55 UTCJul 14, 05:55 UTC3h 0m
2026-07-14 SWA4365 DAL → SMF Jul 14, 02:54 UTCJul 14, 05:52 UTC2h 58m
2026-07-13 SWA4365 - Jul 13, 23:20 UTCJul 14, 01:55 UTC2h 35m
2026-07-13 SWA1247 - Jul 13, 21:05 UTCJul 13, 22:10 UTC1h 5m
2026-07-13 SWA1247 - Jul 13, 19:10 UTCJul 13, 19:50 UTC40m
2026-07-13 SWA575 BNA → MDW Jul 13, 17:05 UTCJul 13, 18:05 UTC1h 0m
2026-07-13 SWA3235 - Jul 13, 12:30 UTCJul 13, 15:30 UTC3h 0m
2026-07-13 SWA3235 PHX → BNA Jul 13, 12:28 UTCJul 13, 15:24 UTC2h 56m
2026-07-13 SWA3674 DAL → PHX Jul 13, 05:15 UTCJul 13, 07:15 UTC2h 0m
2026-07-13 SWA2841 PHX → DAL Jul 13, 01:45 UTCJul 13, 04:00 UTC2h 15m
2026-07-13 SWA2841 PHX → DAL Jul 13, 01:43 UTCJul 13, 03:54 UTC2h 11m
2026-07-12 SWA639 BNA → PHX Jul 12, 21:30 UTCJul 13, 00:35 UTC3h 5m
2026-07-12 SWA2605 - Jul 12, 18:05 UTCJul 12, 19:15 UTC1h 10m
2026-07-12 SWA2605 MCO → BNA Jul 12, 18:04 UTCJul 12, 20:16 UTC2h 12m
2026-07-12 SWA3723 - Jul 12, 15:45 UTCJul 12, 16:40 UTC55m
2026-07-12 SWA3723 - Jul 12, 14:10 UTCJul 12, 14:25 UTC15m
2026-07-12 SWA591 - Jul 12, 12:20 UTCJul 12, 12:30 UTC10m
2026-07-12 SWA591 - Jul 12, 09:50 UTCJul 12, 10:35 UTC45m
2026-07-12 SWA591 TPA → SJU Jul 12, 09:50 UTCJul 12, 12:26 UTC2h 36m
2026-07-11 SWA2713 - Jul 11, 23:55 UTCJul 12, 01:45 UTC1h 50m
2026-07-11 SWA2713 - Jul 11, 22:25 UTCJul 11, 23:00 UTC35m
2026-07-11 SWA812 - Jul 11, 11:20 UTCJul 11, 19:35 UTC8h 15m
2026-07-11 SWA621 SJC → BWI Jul 11, 04:50 UTCJul 11, 09:20 UTC4h 30m
2026-07-11 SWA2500 - Jul 11, 03:01 UTCJul 11, 03:50 UTC50m
2026-07-11 SWA2876 MEV → LGB Jul 11, 01:05 UTCJul 11, 02:10 UTC1h 5m
2026-07-10 SWA2876 - Jul 10, 20:05 UTCJul 10, 23:10 UTC3h 5m
2026-07-10 SWA427 - Jul 10, 16:55 UTCJul 10, 18:55 UTC2h 0m
2026-07-10 SWA427 - Jul 10, 15:00 UTCJul 10, 15:45 UTC45m
2026-07-10 SWA2701 - Jul 10, 11:30 UTCJul 10, 13:30 UTC2h 0m
2026-07-10 SWA2701 TPA → BWI Jul 10, 11:28 UTCJul 10, 13:23 UTC1h 56m
2026-07-10 SWA429 - Jul 10, 09:40 UTCJul 10, 10:20 UTC40m
2026-07-10 SWA429 FLL → TPA Jul 10, 09:37 UTCJul 10, 10:16 UTC39m
2026-07-10 SWA3918 - Jul 10, 01:25 UTCJul 10, 03:50 UTC2h 25m
2026-07-09 SWA3590 - Jul 9, 22:05 UTCJul 9, 23:15 UTC1h 10m
2026-07-09 SWA3590 SAT → STL Jul 9, 22:04 UTCJul 9, 23:44 UTC1h 40m
2026-07-09 SWA1091 - Jul 9, 17:55 UTCJul 9, 20:55 UTC3h 0m
2026-07-09 SWA4117 - Jul 9, 15:45 UTCJul 9, 16:45 UTC1h 0m
2026-07-09 SWA784 - Jul 9, 12:55 UTCJul 9, 14:40 UTC1h 45m
2026-07-09 SWA784 MDW → PVD Jul 9, 12:52 UTCJul 9, 14:38 UTC1h 46m
2026-07-09 SWA4057 - Jul 9, 10:15 UTCJul 9, 11:35 UTC1h 20m
2026-07-09 SWA4057 TUL → MDW Jul 9, 10:10 UTCJul 9, 11:34 UTC1h 24m
2026-07-09 SWA2055 - Jul 9, 03:20 UTCJul 9, 04:30 UTC1h 10m
2026-07-09 SWA2055 BNA → TUL Jul 9, 03:19 UTCJul 9, 04:28 UTC1h 9m
2026-07-09 SWA2078 ATL → BNA Jul 9, 01:50 UTCJul 9, 02:35 UTC45m
2026-07-08 SWA4150 DAL → ATL Jul 8, 22:15 UTCJul 8, 23:55 UTC1h 40m
2026-07-08 SWA2147 - Jul 8, 19:15 UTCJul 8, 21:00 UTC1h 45m

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 N8869L page for operator, model, and routing details .

Mode-S AC37BD frequently asked

What is Mode-S code AC37BD?
AC37BD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8869L.
Where is Mode-S AC37BD registered?
Mode-S code AC37BD 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 AC37BD broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC37BD, octal 53033675, decimal 11,286,461.
What flights does AC37BD operate?
Mode-S AC37BD has broadcast 20 distinct callsigns, including SWA852, SWA3203, SWA1733, SWA3346, SWA2935.