Apparatus

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sensors Mode-S transponder

AC1720

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8785L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC1720
Octal
53013440
Decimal
11,278,112
Country
US
Tail
N8785L
Type
B38M
Transponder active on ground
Flights observed
596
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AC1720.

Country allocation

The ICAO 24-bit address AC1720 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
SWA2236 Southwest Airlines 9 2026-05-20
SWA1890 Southwest Airlines 6 2026-05-24
SWA1881 Southwest Airlines 6 2026-05-06
SWA3597 - 5 2026-06-30
SWA2848 - 5 2026-06-25
SWA2603 Southwest Airlines 5 2026-05-03
SWA2262 Southwest Airlines 5 2026-05-07
SWA900 Southwest Airlines 4 2026-06-08
SWA873 Southwest Airlines 4 2026-05-03
SWA3708 Southwest Airlines 4 2026-04-13
SWA3133 - 4 2026-07-04
SWA2839 Southwest Airlines 4 2026-04-15
SWA2666 Southwest Airlines 4 2026-05-25
SWA2397 - 4 2026-07-12
SWA218 Southwest Airlines 4 2026-05-09
SWA1647 Southwest Airlines 4 2026-04-18
SWA965 - 3 2026-07-03
SWA948 Southwest Airlines 3 2026-05-30
SWA936 Southwest Airlines 3 2026-06-02
SWA751 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA4246 - Jul 14, 00:30 UTCJul 14, 01:55 UTC1h 25m
2026-07-13 SWA1940 - Jul 13, 18:35 UTCJul 13, 23:20 UTC4h 45m
2026-07-13 SWA2148 - Jul 13, 16:20 UTCJul 13, 16:50 UTC30m
2026-07-13 SWA1907 - Jul 13, 06:55 UTCJul 13, 07:15 UTC20m
2026-07-13 SWA2152 - Jul 13, 05:15 UTCJul 13, 05:40 UTC25m
2026-07-13 SWA2152 ITO → HNL Jul 13, 05:03 UTCJul 13, 05:39 UTC36m
2026-07-13 SWA1906 - Jul 13, 03:30 UTCJul 13, 03:50 UTC20m
2026-07-13 SWA1906 HNL → ITO Jul 13, 03:26 UTCJul 13, 04:02 UTC36m
2026-07-13 SWA661 LIH → HNL Jul 13, 01:51 UTCJul 13, 02:26 UTC35m
2026-07-12 SWA1923 HNL → LIH Jul 12, 23:51 UTCJul 13, 00:13 UTC22m
2026-07-12 SWA2397 - Jul 12, 16:20 UTCJul 12, 21:25 UTC5h 5m
2026-07-12 SWA2397 LAX → HNL Jul 12, 16:20 UTCJul 12, 21:25 UTC5h 5m
2026-07-12 SWA4637 AUS → LAS Jul 12, 10:40 UTCJul 12, 14:05 UTC3h 25m
2026-07-12 SWA578 - Jul 12, 03:05 UTCJul 12, 04:10 UTC1h 5m
2026-07-12 SWA3462 RSW → BNA Jul 12, 00:20 UTCJul 12, 02:05 UTC1h 45m
2026-07-12 SWA3462 RSW → BNA Jul 12, 00:18 UTCJul 12, 01:59 UTC1h 41m
2026-07-11 SWA1542 DAL → RSW Jul 11, 21:05 UTCJul 11, 23:25 UTC2h 20m
2026-07-11 SWA1542 DAL → RSW Jul 11, 21:04 UTCJul 11, 23:21 UTC2h 17m
2026-07-11 SWA2221 LAS → DAL Jul 11, 02:40 UTCJul 11, 05:05 UTC2h 25m
2026-07-11 SWA2221 SMF → LAS Jul 11, 00:40 UTCJul 11, 01:40 UTC1h 0m
2026-07-10 SWA4828 - Jul 10, 19:40 UTCJul 10, 22:50 UTC3h 10m
2026-07-10 SWA1586 - Jul 10, 17:25 UTCJul 10, 18:30 UTC1h 5m
2026-07-10 SWA1586 DEN → MCI Jul 10, 17:23 UTCJul 10, 18:40 UTC1h 17m
2026-07-10 SWA4011 - Jul 10, 14:25 UTCJul 10, 16:10 UTC1h 45m
2026-07-10 SWA4953 - Jul 10, 03:40 UTCJul 10, 04:45 UTC1h 5m
2026-07-10 SWA2490 LGB → OAK Jul 10, 01:50 UTCJul 10, 02:45 UTC55m
2026-07-10 SWA2490 LGB → OAK Jul 10, 01:50 UTCJul 10, 02:35 UTC45m
2026-07-10 SWA149 PHX → LGB Jul 10, 00:10 UTCJul 10, 01:05 UTC55m
2026-07-09 SWA149 - Jul 9, 22:20 UTCJul 9, 23:15 UTC55m
2026-07-09 SWA4621 BNA → ABQ Jul 9, 18:50 UTCJul 9, 21:10 UTC2h 20m
2026-07-09 SWA2188 LAS → BNA Jul 9, 14:00 UTCJul 9, 17:10 UTC3h 10m
2026-07-09 SWA4952 OAK → LAS Jul 9, 04:10 UTCJul 9, 05:15 UTC1h 5m
2026-07-09 SWA3853 - Jul 9, 02:00 UTCJul 9, 03:00 UTC1h 0m
2026-07-09 SWA3713 SJC → SNA Jul 9, 00:03 UTCJul 9, 01:01 UTC58m
2026-07-09 SWA3713 - Jul 9, 00:05 UTCJul 9, 01:05 UTC1h 0m
2026-07-08 SWA1940 SJC → DEN Jul 8, 18:25 UTCJul 8, 23:00 UTC4h 35m
2026-07-08 SWA2148 - Jul 8, 16:20 UTCJul 8, 16:50 UTC30m
2026-07-08 SWA1907 - Jul 8, 06:50 UTCJul 8, 07:10 UTC20m
2026-07-08 SWA2170 KOA → HNL Jul 8, 05:05 UTCJul 8, 05:35 UTC30m
2026-07-08 SWA1911 - Jul 8, 03:30 UTCJul 8, 04:00 UTC30m
2026-07-08 SWA1911 HNL → KOA Jul 8, 03:25 UTCJul 8, 03:57 UTC32m
2026-07-08 SWA2151 - Jul 8, 01:50 UTCJul 8, 02:20 UTC30m
2026-07-08 SWA648 - Jul 8, 00:10 UTCJul 8, 00:30 UTC20m
2026-07-07 SWA2150 - Jul 7, 22:20 UTCJul 7, 22:45 UTC25m
2026-07-07 SWA1903 - Jul 7, 19:10 UTCJul 7, 19:30 UTC20m
2026-07-07 SWA1903 HNL → ITO Jul 7, 19:05 UTCJul 7, 19:40 UTC35m
2026-07-07 SWA3092 - Jul 7, 17:35 UTCJul 7, 18:00 UTC25m
2026-07-07 SWA508 SJC → PHX Jul 7, 06:45 UTCJul 7, 07:05 UTC20m
2026-07-07 SWA508 SJC → PHX Jul 7, 06:42 UTCJul 7, 07:04 UTC22m
2026-07-07 SWA3098 - Jul 7, 05:05 UTCJul 7, 05:25 UTC20m

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 N8785L page for operator, model, and routing details .

Mode-S AC1720 frequently asked

What is Mode-S code AC1720?
AC1720 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8785L.
Where is Mode-S AC1720 registered?
Mode-S code AC1720 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 AC1720 broadcasting right now?
Mode-S AC1720 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC1720, octal 53013440, decimal 11,278,112.
What flights does AC1720 operate?
Mode-S AC1720 has broadcast 20 distinct callsigns, including SWA2236, SWA1890, SWA1881, SWA3597, SWA2848.